The information on the nature and magnitude of genes controlling the resistance to net blotch and scald in barley is useful in resistance breeding. Thus, field experiment was conducted at Holetta, Ethiopia in 2015 on barley using six basic generations of (P1, P2, F1, F2, BC1, and BC2) which was derived from ‘HB42’x‘Sabini’ parental cross which were evaluated in RCB design with three replications to investigate the gene actions and interactions gene effects involved in controlling resistance to net blotch and scald diseases in barley. The result of scaling tests and generation mean analysis indicated the predominance of non-additive gene effects including epistasis gene effects than additive gene effects for all parameters and this was also confirmed by variance component analysis. Moreover, the digenic epistatic model failed to explain variation in generation means for all parameters may due to the presence of higher-order interaction and linkages. In general, the results suggest greater influence of non-additive genes including epistasis in the control of both disease parameters studied making early selection ineffective. And ‘HB42’ cultivar contained double resistance to scald and net blotch diseases which needs further study for its exploitation as source of resistance in improving barley yield.
{"title":"Generation Mean Analysis of Net Blotch and Scald Diseases on Barley","authors":"Z. Jalata, F. Mekbib, B. Lakew","doi":"10.12691/WJAR-8-4-6","DOIUrl":"https://doi.org/10.12691/WJAR-8-4-6","url":null,"abstract":"The information on the nature and magnitude of genes controlling the resistance to net blotch and scald in barley is useful in resistance breeding. Thus, field experiment was conducted at Holetta, Ethiopia in 2015 on barley using six basic generations of (P1, P2, F1, F2, BC1, and BC2) which was derived from ‘HB42’x‘Sabini’ parental cross which were evaluated in RCB design with three replications to investigate the gene actions and interactions gene effects involved in controlling resistance to net blotch and scald diseases in barley. The result of scaling tests and generation mean analysis indicated the predominance of non-additive gene effects including epistasis gene effects than additive gene effects for all parameters and this was also confirmed by variance component analysis. Moreover, the digenic epistatic model failed to explain variation in generation means for all parameters may due to the presence of higher-order interaction and linkages. In general, the results suggest greater influence of non-additive genes including epistasis in the control of both disease parameters studied making early selection ineffective. And ‘HB42’ cultivar contained double resistance to scald and net blotch diseases which needs further study for its exploitation as source of resistance in improving barley yield.","PeriodicalId":23702,"journal":{"name":"World Journal of Agricultural Research","volume":"43 1","pages":"142-149"},"PeriodicalIF":0.0,"publicationDate":"2020-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74863609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The rainfall amount and number of rainy days determines the length of growing season, which equally determines the types of crops to be planted in a particular region. This study analyzed the pattern of rainfall in Samaru Zaria, Kaduna State, Northern part of Nigeria from 1961-2017 using data collected from the Institute for Agricultural Research Samaru, Zaria. The result from this research reveals that an inverse relationship exists between the amount of rainfall and the rainy days. Hence, the higher the rainfall amount the lower the rainy days and vice versa. This is attributed to the current change in climate which increases the intensity of annual rainfall but shortens the duration of the rainy days. The equations generated for amount of rainfall pattern was (y= 3.162x - 5270.9) and number of rainy days was obtained as (y = -0.172x + 417.85). As expected, the months of November to March had the lowest mean rainy days (MRDs) <1 day. As a recurrent pattern for the period of study, the onset of appreciable rainy days was observed in the month of April and the number of rainy days increased steadily to reach its peak in August and a sharp decline in October. From the obtained data, the onset and cessation of rainfall could be predicted to fall towards the end of April and September respectively.
{"title":"Changing Pattern of Rainfall Amount and Raindays in Samaru, Northern Nigeria and Their Implications on Crop Production","authors":"A. Lawal, A. Yamusa","doi":"10.12691/wjar-8-4-5","DOIUrl":"https://doi.org/10.12691/wjar-8-4-5","url":null,"abstract":"The rainfall amount and number of rainy days determines the length of growing season, which equally determines the types of crops to be planted in a particular region. This study analyzed the pattern of rainfall in Samaru Zaria, Kaduna State, Northern part of Nigeria from 1961-2017 using data collected from the Institute for Agricultural Research Samaru, Zaria. The result from this research reveals that an inverse relationship exists between the amount of rainfall and the rainy days. Hence, the higher the rainfall amount the lower the rainy days and vice versa. This is attributed to the current change in climate which increases the intensity of annual rainfall but shortens the duration of the rainy days. The equations generated for amount of rainfall pattern was (y= 3.162x - 5270.9) and number of rainy days was obtained as (y = -0.172x + 417.85). As expected, the months of November to March had the lowest mean rainy days (MRDs) <1 day. As a recurrent pattern for the period of study, the onset of appreciable rainy days was observed in the month of April and the number of rainy days increased steadily to reach its peak in August and a sharp decline in October. From the obtained data, the onset and cessation of rainfall could be predicted to fall towards the end of April and September respectively.","PeriodicalId":23702,"journal":{"name":"World Journal of Agricultural Research","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75023186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study aimed to analyze the value chain of wheat in Dembecha district of West Gojjam zone. A total of 130 farm households, 30 traders, 2 bakers, 1 processor, 4 cooperatives and 10 consumers were used to collect the data. Functional and institutional approach of value chain analysis showed input providers, producers, cooperatives, collectors, wholesalers, retailers, and processors were found to be important wheat value chain actors. Four firms concentration ratio (CR4) was found to be 39.78% and there were information asymmetry and observed barriers to enter into wheat market. Buying, selling and pricing strategies showed deviation of wheat market from competitive market norms. Analysis of marketing margins revealed that processors received the highest (39.72%) marketing margin and retailers received the least marketing margins (4.85%) from consumers’ price. Even if wheat in the study area deviate from competitive market norms as a result of oligopolistic market structure and conduct, profitability analysis of wheat market showed all market actors operated at profitable level. Supporting farmers and increase productivity through practical research, develop pie-growing mechanisms among actors, founding agro-processing firm, providing infrastructural facilities, designing advance way of disseminating market information, determining appropriate pricing strategies should be done to strength value chain development.
{"title":"Value Chain Analysis of Wheat (Triticum Aestivum) in Dembecha District, Ethiopia","authors":"Yonnas Addis, Worku Mengesha","doi":"10.12691/WJAR-8-4-3","DOIUrl":"https://doi.org/10.12691/WJAR-8-4-3","url":null,"abstract":"This study aimed to analyze the value chain of wheat in Dembecha district of West Gojjam zone. A total of 130 farm households, 30 traders, 2 bakers, 1 processor, 4 cooperatives and 10 consumers were used to collect the data. Functional and institutional approach of value chain analysis showed input providers, producers, cooperatives, collectors, wholesalers, retailers, and processors were found to be important wheat value chain actors. Four firms concentration ratio (CR4) was found to be 39.78% and there were information asymmetry and observed barriers to enter into wheat market. Buying, selling and pricing strategies showed deviation of wheat market from competitive market norms. Analysis of marketing margins revealed that processors received the highest (39.72%) marketing margin and retailers received the least marketing margins (4.85%) from consumers’ price. Even if wheat in the study area deviate from competitive market norms as a result of oligopolistic market structure and conduct, profitability analysis of wheat market showed all market actors operated at profitable level. Supporting farmers and increase productivity through practical research, develop pie-growing mechanisms among actors, founding agro-processing firm, providing infrastructural facilities, designing advance way of disseminating market information, determining appropriate pricing strategies should be done to strength value chain development.","PeriodicalId":23702,"journal":{"name":"World Journal of Agricultural Research","volume":"3 1","pages":"121-128"},"PeriodicalIF":0.0,"publicationDate":"2020-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74376996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sudeep Pandey, Utsav Koirala, Prabin Acharya, S. Shrestha
Tomato farmers have been facing a major threat of entire crop loss because of bacterial wilt of tomato. Grafting of highly productive scion onto resistant rootstock is one of the best methods to prevent crops from bacterial wilt disease. An experiment was conducted using tomato (RS-101) and eggplant (KER-DC-117) rootstocks grafted with six scion varieties in different combinations to make total of nine treatments replicated three times in completely randomized design in the naturally infected farmer’s fields at Dahachok, Nepal in 2019. All the three treatments with eggplant rootstock (KER-DC-117) were found to be resistant. Karma 777, Shrijana and Samjhana scions grafted onto tomato rootstock (RS-101) were moderately resistant, whereas Sarita and Karma 555 grafted onto tomato rootstock (RS-101) were moderately susceptible. Non-grafted Sarita was highly susceptible with 100% disease incidence. There were no bacterial browning and bacterial oozing in treatments with tomato rootstock (RS-101). The yield and number of fruits was maximum with Karma 444 grafted onto eggplant rootstock (KER-DC-117). So, Karma 444 + ER (KER-DC-117) is the best scion-rootstock combination to manage bacterial wilt against tomato at Dahachok, Kathmandu.
由于番茄细菌性枯萎病，番茄种植者一直面临着整个作物损失的重大威胁。将高产接穗嫁接到抗病砧木上是预防作物青枯病的最佳方法之一。2019年，在尼泊尔达哈乔克自然感染的农民田间，采用完全随机设计，将番茄(RS-101)和茄子(KER-DC-117)砧木以不同组合嫁接6个接穗品种，共9个处理重复3次。3种砧木(KER-DC-117)处理均具有抗性。嫁接到番茄砧木(RS-101)上的Karma 777、Shrijana和Samjhana接穗具有中等抗性，嫁接到番茄砧木(RS-101)上的Sarita和Karma 555接穗具有中等抗性。未嫁接的莎丽塔易感，发病率100%。番茄砧木(RS-101)处理无细菌褐变和渗菌现象。嫁接到茄子砧木(KER-DC-117)上的Karma 444产量和果实数最高。因此，Karma 444 + ER (KER-DC-117)是防治番茄青枯病的最佳接穗-砧木组合。
{"title":"Management of Bacterial Wilt Using Grafting Technique in Tomato (Ralstonia solanacearum)","authors":"Sudeep Pandey, Utsav Koirala, Prabin Acharya, S. Shrestha","doi":"10.12691/WJAR-8-4-4","DOIUrl":"https://doi.org/10.12691/WJAR-8-4-4","url":null,"abstract":"Tomato farmers have been facing a major threat of entire crop loss because of bacterial wilt of tomato. Grafting of highly productive scion onto resistant rootstock is one of the best methods to prevent crops from bacterial wilt disease. An experiment was conducted using tomato (RS-101) and eggplant (KER-DC-117) rootstocks grafted with six scion varieties in different combinations to make total of nine treatments replicated three times in completely randomized design in the naturally infected farmer’s fields at Dahachok, Nepal in 2019. All the three treatments with eggplant rootstock (KER-DC-117) were found to be resistant. Karma 777, Shrijana and Samjhana scions grafted onto tomato rootstock (RS-101) were moderately resistant, whereas Sarita and Karma 555 grafted onto tomato rootstock (RS-101) were moderately susceptible. Non-grafted Sarita was highly susceptible with 100% disease incidence. There were no bacterial browning and bacterial oozing in treatments with tomato rootstock (RS-101). The yield and number of fruits was maximum with Karma 444 grafted onto eggplant rootstock (KER-DC-117). So, Karma 444 + ER (KER-DC-117) is the best scion-rootstock combination to manage bacterial wilt against tomato at Dahachok, Kathmandu.","PeriodicalId":23702,"journal":{"name":"World Journal of Agricultural Research","volume":"5 1","pages":"129-133"},"PeriodicalIF":0.0,"publicationDate":"2020-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86173507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
B. Abdallah, S. Githiri, W. Kariuki, Hemedi Mkuzi Saha
The production of sweet potato (Ipomoea batatas (L.) Lam.) in coastal Kenya is diminishing due to unreliable rainfall, coupled with farmers’ use of unimproved sweet potato varieties that are not drought tolerant. A study was conducted at Pwani University from 2016 to 2017, to identify sweet potato clones with best performance under low water stress. Nine clones (6.1A, 4.10, 7.8, 15.10, 7.6AO, 10.10B, 4.2B, 7.6B and 4.2A) and a farmer-preferred variety “Rabai” were evaluated under the following four water stress levels: (i) Watering for the first two months after planting and stressing the plants for the next three months - S3, (ii) Watering for the first three months after planting and stressing the plants for the next two months - S2, (iii) Watering for the first four months after planting and stressing the plants for the next one month - S1, and (iv) Watering throughout the growing period and not stressing the plants at all - S0. A randomized complete block design was used, with factorial arrangement of treatments. Treatments were replicated three times. Tuber circumference was reduced by low water stress irrespective of the time it started, relative to the growing season. Water stress that was imposed early in the season, at three or two months after planting, reduced tuber yield by about 52 and 70%, respectively. Sweet potato clones C2 and C8 performed relatively well across seasons, irrespective of the water stress level. Farmers are likely to realize improved tuber yields by planting sweet potato early in the rainfall season to ensure adequate soil water during the first four months of crop growth. Sweet potato clones C2 and C8 are therefore recommended for multi-locational trials in coastal lowland Kenya, to ascertain their performance across agro-ecological zones.
{"title":"Evaluation of the Performance of Sweet Potato (Ipomoea batatas) Clones under Water Stress in the Coastal Lowlands of Kenya","authors":"B. Abdallah, S. Githiri, W. Kariuki, Hemedi Mkuzi Saha","doi":"10.12691/WJAR-8-4-2","DOIUrl":"https://doi.org/10.12691/WJAR-8-4-2","url":null,"abstract":"The production of sweet potato (Ipomoea batatas (L.) Lam.) in coastal Kenya is diminishing due to unreliable rainfall, coupled with farmers’ use of unimproved sweet potato varieties that are not drought tolerant. A study was conducted at Pwani University from 2016 to 2017, to identify sweet potato clones with best performance under low water stress. Nine clones (6.1A, 4.10, 7.8, 15.10, 7.6AO, 10.10B, 4.2B, 7.6B and 4.2A) and a farmer-preferred variety “Rabai” were evaluated under the following four water stress levels: (i) Watering for the first two months after planting and stressing the plants for the next three months - S3, (ii) Watering for the first three months after planting and stressing the plants for the next two months - S2, (iii) Watering for the first four months after planting and stressing the plants for the next one month - S1, and (iv) Watering throughout the growing period and not stressing the plants at all - S0. A randomized complete block design was used, with factorial arrangement of treatments. Treatments were replicated three times. Tuber circumference was reduced by low water stress irrespective of the time it started, relative to the growing season. Water stress that was imposed early in the season, at three or two months after planting, reduced tuber yield by about 52 and 70%, respectively. Sweet potato clones C2 and C8 performed relatively well across seasons, irrespective of the water stress level. Farmers are likely to realize improved tuber yields by planting sweet potato early in the rainfall season to ensure adequate soil water during the first four months of crop growth. Sweet potato clones C2 and C8 are therefore recommended for multi-locational trials in coastal lowland Kenya, to ascertain their performance across agro-ecological zones.","PeriodicalId":23702,"journal":{"name":"World Journal of Agricultural Research","volume":"11 1","pages":"114-120"},"PeriodicalIF":0.0,"publicationDate":"2020-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82851547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Vegetation growth is functionally dependent on climate. Though increased yields have been attained through plant breeding, yet it is well established that genetic factors alone cannot cause a plant character to develop to its maximum potential without a favorable environment. Plants can be made to adapt to conditions which deviate from their natural habitat through breeding and acclimatization. Three local, Oba super-2 hybrid and seventeen maize accessions/varieties newly developed by the Institute for Agricultural Research (IAR) Samaru Zaria, in collaboration with the International Institute of Tropical Agriculture (IITA), for the northern guinea savanna belt, were evaluated for their relative yield performances in the derived savanna belt of Nigeria. The assessments were carried out at the Department of Crop Science teaching and research farm, University of Nigeria, Nsukka. Parameters assessed include field germination percentage, days to first tassel appearance, days to fifty percent tassel appearance, days to fifty percent silking, percentage, double cob per stand, percentage triple cob per stand, plant height, days to maturity, percentage harvest index, cob weight, grain weight per ear e.tc. Correlation and path analysis were used to ascertain the degree of association of traits with yield. Biomass weight was observed to have the highest direct positive influence on yield. Therefore, varieties with high biomass weight (Sammaz-14, 17 and 18) consistently produced high yield. This results could be useful to breeders as they work to produce maize varieties that will perform better in the derived savanna zone of the country. That will make for increased availability and choice of planting materials for farmers and ultimately, increased productivity and sustainability of maize production in the derived Savanna Zones of Nigeria. Further screening of these accessions should also be encouraged in the zone until adaptation is established.
{"title":"Field Evaluation of Some Varieties/Accessions of Maize for Their Performances in a Derived Savannah Belt of Nigeria","authors":"Abba Nathan Yatai, Chukwulobe Modesta Ngozi, Echezona Bonaventure Chukwujindu","doi":"10.12691/WJAR-8-4-1","DOIUrl":"https://doi.org/10.12691/WJAR-8-4-1","url":null,"abstract":"Vegetation growth is functionally dependent on climate. Though increased yields have been attained through plant breeding, yet it is well established that genetic factors alone cannot cause a plant character to develop to its maximum potential without a favorable environment. Plants can be made to adapt to conditions which deviate from their natural habitat through breeding and acclimatization. Three local, Oba super-2 hybrid and seventeen maize accessions/varieties newly developed by the Institute for Agricultural Research (IAR) Samaru Zaria, in collaboration with the International Institute of Tropical Agriculture (IITA), for the northern guinea savanna belt, were evaluated for their relative yield performances in the derived savanna belt of Nigeria. The assessments were carried out at the Department of Crop Science teaching and research farm, University of Nigeria, Nsukka. Parameters assessed include field germination percentage, days to first tassel appearance, days to fifty percent tassel appearance, days to fifty percent silking, percentage, double cob per stand, percentage triple cob per stand, plant height, days to maturity, percentage harvest index, cob weight, grain weight per ear e.tc. Correlation and path analysis were used to ascertain the degree of association of traits with yield. Biomass weight was observed to have the highest direct positive influence on yield. Therefore, varieties with high biomass weight (Sammaz-14, 17 and 18) consistently produced high yield. This results could be useful to breeders as they work to produce maize varieties that will perform better in the derived savanna zone of the country. That will make for increased availability and choice of planting materials for farmers and ultimately, increased productivity and sustainability of maize production in the derived Savanna Zones of Nigeria. Further screening of these accessions should also be encouraged in the zone until adaptation is established.","PeriodicalId":23702,"journal":{"name":"World Journal of Agricultural Research","volume":"152 1","pages":"105-113"},"PeriodicalIF":0.0,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85297828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The goal of regular modification of threshing machine is to increase soybean processing efficiency. This study was carried out to deconstruct the thresher’s parameter - output relationship and to evolve a model for such relationship at the Engineering workshop of the Federal College of Agriculture, Ibadan, Oyo State Nigeria. Unthreshed soybeans, CGX14x1448 were used to evaluate the performance of a modified spike tooth thresher fabricated at the Workshop. The summary statistics of the machine output showed that concave clearance had percentage unthreshed soybean of 16.98%, percentage mechanically damaged seed of 8.625%, blown seed of 23.403kg and high seed loss of 44.241kg. Both the mean cleaning efficiency (94.175) and threshing efficiency (83.022) were very high. The trend of the cylinder speed however contrasts with those of concave clearance and moisture content. The percentage unthreshed (83.212%), percentage mechanical damage (16.792%) were in contrast to each other. Similarly, the threshing (44.108) and cleaning (23.321) efficiency were low. The relationships between cylinder speed and machine output showed an increasing trends for blown seed, percentage damaged seed and seed loss. Concave clearance - threshing efficiency can be predicted using 3 most parsimonious models (xy-inverse, exponential and simple linear model). High adjusted coefficients of determinations (R2) were obtained for the best model of cylinder speed - threshing efficiency model. These were 0.9997 for the xy inverse and 0.9998 for quadratic 0.993 for exponential model with estimation variance of 0.00047 (quadratic), 0.000 for inverse xy and 0.000191 (exponential model). The practical application of the models is in the specificity of the measurement of the relationship between thresher’s parameters and output.
{"title":"Machine Crop Parameters’ Model of Spike - Tooth Thresher for Soybean","authors":"T. A. Ilori, T. Dauda, Adewumi I.O","doi":"10.12691/WJAR-8-3-5","DOIUrl":"https://doi.org/10.12691/WJAR-8-3-5","url":null,"abstract":"The goal of regular modification of threshing machine is to increase soybean processing efficiency. This study was carried out to deconstruct the thresher’s parameter - output relationship and to evolve a model for such relationship at the Engineering workshop of the Federal College of Agriculture, Ibadan, Oyo State Nigeria. Unthreshed soybeans, CGX14x1448 were used to evaluate the performance of a modified spike tooth thresher fabricated at the Workshop. The summary statistics of the machine output showed that concave clearance had percentage unthreshed soybean of 16.98%, percentage mechanically damaged seed of 8.625%, blown seed of 23.403kg and high seed loss of 44.241kg. Both the mean cleaning efficiency (94.175) and threshing efficiency (83.022) were very high. The trend of the cylinder speed however contrasts with those of concave clearance and moisture content. The percentage unthreshed (83.212%), percentage mechanical damage (16.792%) were in contrast to each other. Similarly, the threshing (44.108) and cleaning (23.321) efficiency were low. The relationships between cylinder speed and machine output showed an increasing trends for blown seed, percentage damaged seed and seed loss. Concave clearance - threshing efficiency can be predicted using 3 most parsimonious models (xy-inverse, exponential and simple linear model). High adjusted coefficients of determinations (R2) were obtained for the best model of cylinder speed - threshing efficiency model. These were 0.9997 for the xy inverse and 0.9998 for quadratic 0.993 for exponential model with estimation variance of 0.00047 (quadratic), 0.000 for inverse xy and 0.000191 (exponential model). The practical application of the models is in the specificity of the measurement of the relationship between thresher’s parameters and output.","PeriodicalId":23702,"journal":{"name":"World Journal of Agricultural Research","volume":"6 1","pages":"97-104"},"PeriodicalIF":0.0,"publicationDate":"2020-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86642704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Groundnut production is largely constrained by biotic stresses with groundnut rosette virus disease seriously contributing to losses in yield in Nigeria and sub Saharan Africa. This study was conducted to understand performances and correlations between aphid resistance, rosette resistance and other quantitative characters. Two aphid resistance, one rosette resistance, one aphid susceptible and one rosette susceptible lines were used as parents to develop F1s, F2s, BC1P1 and BC1P2. The seventeen generations obtained were evaluated along with three checks in three replications using randomized complete block design. The F1 generations had higher mean performance compared to the parents suggesting heterosis. The segregating generations (F2s, BC1P1 and BC1P2) had mean values higher or lower than the parents due to transgressive genes. The genotypic correlation coefficients in contrasting magnitudes and directions exceeded those of the corresponding phenotypic correlation coefficients for most of the character pairs indicating that the correlations were more genetic than environmental in the three sets of crosses studied.
{"title":"Genetic Associations under Aphids and Rosette Stress in Groundnut (Arachis hypogaea L.)","authors":"V. Musa, S. E. Akogu, F. Agbaji, H. Adah","doi":"10.12691/WJAR-8-3-4","DOIUrl":"https://doi.org/10.12691/WJAR-8-3-4","url":null,"abstract":"Groundnut production is largely constrained by biotic stresses with groundnut rosette virus disease seriously contributing to losses in yield in Nigeria and sub Saharan Africa. This study was conducted to understand performances and correlations between aphid resistance, rosette resistance and other quantitative characters. Two aphid resistance, one rosette resistance, one aphid susceptible and one rosette susceptible lines were used as parents to develop F1s, F2s, BC1P1 and BC1P2. The seventeen generations obtained were evaluated along with three checks in three replications using randomized complete block design. The F1 generations had higher mean performance compared to the parents suggesting heterosis. The segregating generations (F2s, BC1P1 and BC1P2) had mean values higher or lower than the parents due to transgressive genes. The genotypic correlation coefficients in contrasting magnitudes and directions exceeded those of the corresponding phenotypic correlation coefficients for most of the character pairs indicating that the correlations were more genetic than environmental in the three sets of crosses studied.","PeriodicalId":23702,"journal":{"name":"World Journal of Agricultural Research","volume":"24 1","pages":"89-96"},"PeriodicalIF":0.0,"publicationDate":"2020-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77877008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Dharmadasa, Jayasinghe J.A.T.U., Arawwawala L.D.A.M., Fonseka D.L.C.K
Steaming with aromatic poly herbal formulations has been practiced as an effective treatment for curing or controlling infectious diseases, deterring of pest species, destroying of unwanted microbial contaminations by several cultures. Steaming of Pasppangiri, a mixture of leaves of five species (Citrus aurantium Linn, Citrus aurantifolia (Christm. & Panzer) Swingle, Citrus sinensis Linn, Atlantia ceylanica (Am.) Oliver, Citrus reticulata Blanco) has been used for an effective treatment for curing of microbial infected, respiratory system related diseases. However, information on volatile compounds, compositional analysis of Paspangiri is lacking or scattered. Leaves of five citrus species were collected from previously authenticated plants grown in same soil and climatic conditions. Essential oil was separated by hydro distillation method. The chemical composition of the essential oil of Paspangiri was analysed using gas chromatography-mass spectrometry (GC-MS). Results revealed that the number of compounds observed in each species were varied as Citrus sinensis (27)>aurantium (25) >Citrus reticulata (20)>Citrus aurantifolia (19)>Atlantia ceylanica (5) respectively. The major bioactive molecules identified in essential oils of Paspangiri such as linalool, limonene, caryophyllene, eugenol, z-citral, ∞- pinene, sabinene, and myrcene, either singularly or as a mixture have been exhibited antimicrobial properties. Therefore, the present study, partially validate the traditional claims of inhaling of Paspangiri steam for prevention or curing of infectious disease.
{"title":"Compositional Analysis of Volatile Compounds of Paspangiri - A Mixture of Leaves of Five Rutaceae Plants Used as an Effective Remedy for Respiratory System Microbial Infections in Traditional Systems of Medicine","authors":"R. Dharmadasa, Jayasinghe J.A.T.U., Arawwawala L.D.A.M., Fonseka D.L.C.K","doi":"10.12691/WJAR-8-3-3","DOIUrl":"https://doi.org/10.12691/WJAR-8-3-3","url":null,"abstract":"Steaming with aromatic poly herbal formulations has been practiced as an effective treatment for curing or controlling infectious diseases, deterring of pest species, destroying of unwanted microbial contaminations by several cultures. Steaming of Pasppangiri, a mixture of leaves of five species (Citrus aurantium Linn, Citrus aurantifolia (Christm. & Panzer) Swingle, Citrus sinensis Linn, Atlantia ceylanica (Am.) Oliver, Citrus reticulata Blanco) has been used for an effective treatment for curing of microbial infected, respiratory system related diseases. However, information on volatile compounds, compositional analysis of Paspangiri is lacking or scattered. Leaves of five citrus species were collected from previously authenticated plants grown in same soil and climatic conditions. Essential oil was separated by hydro distillation method. The chemical composition of the essential oil of Paspangiri was analysed using gas chromatography-mass spectrometry (GC-MS). Results revealed that the number of compounds observed in each species were varied as Citrus sinensis (27)>aurantium (25) >Citrus reticulata (20)>Citrus aurantifolia (19)>Atlantia ceylanica (5) respectively. The major bioactive molecules identified in essential oils of Paspangiri such as linalool, limonene, caryophyllene, eugenol, z-citral, ∞- pinene, sabinene, and myrcene, either singularly or as a mixture have been exhibited antimicrobial properties. Therefore, the present study, partially validate the traditional claims of inhaling of Paspangiri steam for prevention or curing of infectious disease.","PeriodicalId":23702,"journal":{"name":"World Journal of Agricultural Research","volume":"65 1","pages":"84-88"},"PeriodicalIF":0.0,"publicationDate":"2020-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82842943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pseudomonas species have founded as greatest and potentially most promising group of plant growth promoting rhizobacteria (PGPR). Pseudomonas aeruginosa UPMP3 is an important PGPR isolated from oil palm rhizosphere. This rhizobacteria is likely to synthesize and release phytohormone indole-3 acetic acid (IAA). Production of IAA is one of the main reasons to promote plant growth and yield. The aim of this study was to detect, identify and quantify the IAA production by P. aeruginosa UPMP3 in vitro and its influence on oil palm seedling growth. Nutrient broth medium supplemented with 1-5 mg/ml L-tryptophan and without L- tryptophan were used for bacterial culture. The pH levels of culture media were optimized under shaken and static conditions and incubated at 28±2°C in different incubation periods. The production of IAA by P. aeruginosa UPMP3 was extracted, purified, detected and quantified by Thin Layer Chromatography (TLC) and High Performance Liquid Chromatography (HPLC) analyses. Production of IAA was quantified by HPLC in liquid culture and achieved 12.08µg/ml with a retention time of 13.711 min. On the other hand, the maximum 52 µg/ml IAA was recorded in the medium supplemented with 4 mg/ml L- tryptophan in compare to control. The optimum pH level of the culture medium was recorded as 7 under shaken conditions at 150 rpm with 5 days incubation. The influence of IAA produced by the UPMP3 on oil palm seedling growth was carried out in the pot experiment. The germinated oil palm seedlings were treated with the extract of bacterial strain and observed a positive effect on seedling growth in respect to average root and leaf number, root, shoot, and leaf length compare to the synthetic IAA and the control.
{"title":"Identification, Determination and Quantification of Indole-3-Acetic Acid Produced by Pseudomonas aeruginosa UPMP3 and Its Effect on The Growth of Oil Palm (Elaeis guineensis Jacq)","authors":"W. Parvin, M. Rahman, Nisha Govender, M. Wong","doi":"10.12691/WJAR-8-3-2","DOIUrl":"https://doi.org/10.12691/WJAR-8-3-2","url":null,"abstract":"Pseudomonas species have founded as greatest and potentially most promising group of plant growth promoting rhizobacteria (PGPR). Pseudomonas aeruginosa UPMP3 is an important PGPR isolated from oil palm rhizosphere. This rhizobacteria is likely to synthesize and release phytohormone indole-3 acetic acid (IAA). Production of IAA is one of the main reasons to promote plant growth and yield. The aim of this study was to detect, identify and quantify the IAA production by P. aeruginosa UPMP3 in vitro and its influence on oil palm seedling growth. Nutrient broth medium supplemented with 1-5 mg/ml L-tryptophan and without L- tryptophan were used for bacterial culture. The pH levels of culture media were optimized under shaken and static conditions and incubated at 28±2°C in different incubation periods. The production of IAA by P. aeruginosa UPMP3 was extracted, purified, detected and quantified by Thin Layer Chromatography (TLC) and High Performance Liquid Chromatography (HPLC) analyses. Production of IAA was quantified by HPLC in liquid culture and achieved 12.08µg/ml with a retention time of 13.711 min. On the other hand, the maximum 52 µg/ml IAA was recorded in the medium supplemented with 4 mg/ml L- tryptophan in compare to control. The optimum pH level of the culture medium was recorded as 7 under shaken conditions at 150 rpm with 5 days incubation. The influence of IAA produced by the UPMP3 on oil palm seedling growth was carried out in the pot experiment. The germinated oil palm seedlings were treated with the extract of bacterial strain and observed a positive effect on seedling growth in respect to average root and leaf number, root, shoot, and leaf length compare to the synthetic IAA and the control.","PeriodicalId":23702,"journal":{"name":"World Journal of Agricultural Research","volume":"35 1","pages":"75-83"},"PeriodicalIF":0.0,"publicationDate":"2020-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75896438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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