Pub Date : 2022-02-01DOI: 10.17503/agrivita.v44i1.3102
I. Sani, Yudistira Wahyu Kurnia, Hana Christine Sinthya, Richard Anthony, E. C. Situmorang, C. Utomo, T. Liwang
Indonesia is a major producer of palm oil. Consequently, the use of chemical fertilizers has become more extensive. Microalgae represent a potential alternative for enhancing and protecting crops based on their cell elements. This study applies dry biomass or liquid culture formulation of the green microalgae Haematococcus pluvialis to the rhizosphere of oil palm pre-nursery as a biofertilizer. Soil application of microalgae biomass of 0.5 g/l (MA) or liquid culture of 10% (v/v) (BCMA) is carried out to assess its effects on 4-months-old oil palm at the nursery stage. The compatibility test between microalgae and bio fungicide agents in agricultural practices, Trichoderma spp., is also tested on both microalgae formulations. The result shows that both microalgae biomass and liquid culture, alone or combined with Trichoderma spp., give a better growth performance to the oil palm. The application of MA and BCMA result in a maximum increment of plant height, leaves count, and chlorophyll content. Furthermore, the application of BCMA gives better oil palm growth performance, which may probably be influenced by the accessibility of nutrients for microalgae growth. The study reveals that soil application of microalgae as biofertilizers can improve oil palm growth performance.
{"title":"Exploring The Potency of Microalgae-Based Biofertilizer and Its Impact on Oil Palm Seedlings Growth","authors":"I. Sani, Yudistira Wahyu Kurnia, Hana Christine Sinthya, Richard Anthony, E. C. Situmorang, C. Utomo, T. Liwang","doi":"10.17503/agrivita.v44i1.3102","DOIUrl":"https://doi.org/10.17503/agrivita.v44i1.3102","url":null,"abstract":"Indonesia is a major producer of palm oil. Consequently, the use of chemical fertilizers has become more extensive. Microalgae represent a potential alternative for enhancing and protecting crops based on their cell elements. This study applies dry biomass or liquid culture formulation of the green microalgae Haematococcus pluvialis to the rhizosphere of oil palm pre-nursery as a biofertilizer. Soil application of microalgae biomass of 0.5 g/l (MA) or liquid culture of 10% (v/v) (BCMA) is carried out to assess its effects on 4-months-old oil palm at the nursery stage. The compatibility test between microalgae and bio fungicide agents in agricultural practices, Trichoderma spp., is also tested on both microalgae formulations. The result shows that both microalgae biomass and liquid culture, alone or combined with Trichoderma spp., give a better growth performance to the oil palm. The application of MA and BCMA result in a maximum increment of plant height, leaves count, and chlorophyll content. Furthermore, the application of BCMA gives better oil palm growth performance, which may probably be influenced by the accessibility of nutrients for microalgae growth. The study reveals that soil application of microalgae as biofertilizers can improve oil palm growth performance.","PeriodicalId":44658,"journal":{"name":"Agrivita","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46646689","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}
Pub Date : 2022-02-01DOI: 10.17503/agrivita.v44i1.3079
Gita Novita Sari, D. Saptadi, K. Kuswanto
Varieties with high yield stability are required to increase the yield. This study examines the strength and adaptability of seven Bambara groundnut lines in three areas. The seven lines used are CCC 1.6, PWBG 6, PWBG 521, SS 342, SS 242, BBL 11, and TVSU 86 as checks. The research sites are Brawijaya University Experimental Station, Farmer field in Madiun and Indonesia Legumes, and Tuber Crop Research Institute (ILETRI) Research Station. Research is conducted from February to October 2020. The study used a randomized block design with three replications. The Eberhart-Russel and FinlayWilkinson methods were used to analyze stability and adaptability. The Genotype x Environmental interaction (GxE) results of the 7 Bambara groundnut lines are at 50% flowering time, seed weight per plant, 100-seed weight, yield, and harvest age. The stability and adaptability analysis shows that BBL 1.1 line is the variety with an earlier harvest period, highest yield potential, good stability, and wide adaptability. The CCC 1.1, PWBG 6, PWBG 5.2.1, and SS 2.4.2 production lines are stable in all experimental environments but low productivity. The SS 3.4.2 is suitable for planting in a production environment. TVSU 86 is ideal for producing in marginal habitats such as drought conditions.
{"title":"The Yield Stability and Adaptability of Bambara Groundnut at Three Locations","authors":"Gita Novita Sari, D. Saptadi, K. Kuswanto","doi":"10.17503/agrivita.v44i1.3079","DOIUrl":"https://doi.org/10.17503/agrivita.v44i1.3079","url":null,"abstract":"Varieties with high yield stability are required to increase the yield. This study examines the strength and adaptability of seven Bambara groundnut lines in three areas. The seven lines used are CCC 1.6, PWBG 6, PWBG 521, SS 342, SS 242, BBL 11, and TVSU 86 as checks. The research sites are Brawijaya University Experimental Station, Farmer field in Madiun and Indonesia Legumes, and Tuber Crop Research Institute (ILETRI) Research Station. Research is conducted from February to October 2020. The study used a randomized block design with three replications. The Eberhart-Russel and FinlayWilkinson methods were used to analyze stability and adaptability. The Genotype x Environmental interaction (GxE) results of the 7 Bambara groundnut lines are at 50% flowering time, seed weight per plant, 100-seed weight, yield, and harvest age. The stability and adaptability analysis shows that BBL 1.1 line is the variety with an earlier harvest period, highest yield potential, good stability, and wide adaptability. The CCC 1.1, PWBG 6, PWBG 5.2.1, and SS 2.4.2 production lines are stable in all experimental environments but low productivity. The SS 3.4.2 is suitable for planting in a production environment. TVSU 86 is ideal for producing in marginal habitats such as drought conditions.","PeriodicalId":44658,"journal":{"name":"Agrivita","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42465172","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}
Pub Date : 2022-02-01DOI: 10.17503/agrivita.v44i1.3372
Victor Ohileobo Dania, Enwongu Uso Henry
Sclerotium rolfsii is a soil-borne pathogen causing stem and root rot disease with concomitant reduction in growth and yield of cowpea. Therefore, this study evaluated pathogenicity of S. rolfsii isolates and the management of root and stem rot disease using Trichoderma species. The isolates were obtained from cowpea rhizosphere and pathogenicity was determined using a susceptible cowpea genotype ITI0K–815-5 in an experiment arranged in a completely randomized design with four replications. In vitro and in vivo trials of Trichoderma spp. against a selected virulent isolate Sclerotium rolfsii (SR06) were conducted in the laboratory and screenhouse, respectively. All nine S. rolfsii isolates were pathogenic to the cowpea genotype, while isolate SR 06 was the most virulent with 85.56% infectivity rate. Treatments with T. virens and T. atroviride application reduced the disease incidences to 22.2% and 25.3%, respectively, compared to synthetic funguforce fungicide. Plants that were inoculated and treated with T. atroviride had significantly higher yield of 435 kg/ha than other treatments (p<0.037). Findings from this research encourages the incorporation of Trichoderma species in the integrated management of S. rolfsii pathogen and the incidence of stem and root rot disease in cowpea.
{"title":"Pathogenicity of Sclerotium rolfsii Isolates Causing Stem and Root Rot Disease of Cowpea Vigna unguiculata (L.) Walp and Management Using Trichoderma Species","authors":"Victor Ohileobo Dania, Enwongu Uso Henry","doi":"10.17503/agrivita.v44i1.3372","DOIUrl":"https://doi.org/10.17503/agrivita.v44i1.3372","url":null,"abstract":"Sclerotium rolfsii is a soil-borne pathogen causing stem and root rot disease with concomitant reduction in growth and yield of cowpea. Therefore, this study evaluated pathogenicity of S. rolfsii isolates and the management of root and stem rot disease using Trichoderma species. The isolates were obtained from cowpea rhizosphere and pathogenicity was determined using a susceptible cowpea genotype ITI0K–815-5 in an experiment arranged in a completely randomized design with four replications. In vitro and in vivo trials of Trichoderma spp. against a selected virulent isolate Sclerotium rolfsii (SR06) were conducted in the laboratory and screenhouse, respectively. All nine S. rolfsii isolates were pathogenic to the cowpea genotype, while isolate SR 06 was the most virulent with 85.56% infectivity rate. Treatments with T. virens and T. atroviride application reduced the disease incidences to 22.2% and 25.3%, respectively, compared to synthetic funguforce fungicide. Plants that were inoculated and treated with T. atroviride had significantly higher yield of 435 kg/ha than other treatments (p<0.037). Findings from this research encourages the incorporation of Trichoderma species in the integrated management of S. rolfsii pathogen and the incidence of stem and root rot disease in cowpea.","PeriodicalId":44658,"journal":{"name":"Agrivita","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47499091","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}
Pub Date : 2022-02-01DOI: 10.17503/agrivita.v44i1.2730
L. Soesanto, S. Latifah, Abdul Manan, Endang Mugiastuti, W. S. Suharti
This research aims to determine the best pH media for the production of Pseudomonas fluorescens P20 raw secondary metabolites, its effect on controlling damping-off, and on cucumber seedling growth. In vitro test uses completely randomized design with four replicates and seven treatments consisted of pH 5.0; 5.5; 6.0; 6.5; 7.0; 7.5; and 8.0. In planta test uses a randomized block design with three replicates and ten treatments consisting of control, mancozeb 80%, and raw secondary metabolites with pH 7.0 and 7.5, and 4 concentration levels, i.e., 5, 10, 15, and 20%. Variables observe population density, inhibition ability, protease and chitinase qualitatively, germination ability, incubation period, disease incidence, the area under disease progress curve (AUDPC), crop height, number of leaves, root length, and crop fresh weight. The result shows that the best pH for the production of raw secondary metabolites is 7.0, indicated by population density as 5.68 × 1024 cfu/ml, inhibition ability as 50.8%, and the best protease and chitinase qualitatively. Application of the secondary metabolites on pH 7.0 could suppress disease intensity, incubation period, and AUDPC as 66.67, 77%, and 0%-day, respectively, and increase crop height, the number of leaves, root length, and crop fresh weight as 57.65, 37.19, 63, and 74%, respectively.
{"title":"Various pH Media Influence Production of Pseudomonas fluorescens P20 Raw Secondary Metabolites for Controlling Damping-off (Pythium sp.) in Cucumber Seedlings","authors":"L. Soesanto, S. Latifah, Abdul Manan, Endang Mugiastuti, W. S. Suharti","doi":"10.17503/agrivita.v44i1.2730","DOIUrl":"https://doi.org/10.17503/agrivita.v44i1.2730","url":null,"abstract":"This research aims to determine the best pH media for the production of Pseudomonas fluorescens P20 raw secondary metabolites, its effect on controlling damping-off, and on cucumber seedling growth. In vitro test uses completely randomized design with four replicates and seven treatments consisted of pH 5.0; 5.5; 6.0; 6.5; 7.0; 7.5; and 8.0. In planta test uses a randomized block design with three replicates and ten treatments consisting of control, mancozeb 80%, and raw secondary metabolites with pH 7.0 and 7.5, and 4 concentration levels, i.e., 5, 10, 15, and 20%. Variables observe population density, inhibition ability, protease and chitinase qualitatively, germination ability, incubation period, disease incidence, the area under disease progress curve (AUDPC), crop height, number of leaves, root length, and crop fresh weight. The result shows that the best pH for the production of raw secondary metabolites is 7.0, indicated by population density as 5.68 × 1024 cfu/ml, inhibition ability as 50.8%, and the best protease and chitinase qualitatively. Application of the secondary metabolites on pH 7.0 could suppress disease intensity, incubation period, and AUDPC as 66.67, 77%, and 0%-day, respectively, and increase crop height, the number of leaves, root length, and crop fresh weight as 57.65, 37.19, 63, and 74%, respectively.","PeriodicalId":44658,"journal":{"name":"Agrivita","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41954166","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}
Pub Date : 2022-02-01DOI: 10.17503/agrivita.v41i0.1291
Ubad Badrudin, Syakiroh Jazilah, B. Prakoso
Soil health decreases and residual pesticides increase due to the application of inorganic fertilizers and pesticides continuously during the cultivation of crops. The effect of 12 hours or 24 hours soil submersion and chicken litters or zeolite application before planting on residual pesticides in soil and bulbs of shallots (Allium ascalonicum L.) are studied. Samples of soils and bulbs have proceeded after shallot cultivation conducted in Brebes, Indonesia. Then organophosphate residues in the samples are analyzed using gas chromatography in the Laboratory of the Indonesian Agricultural Environment Research Institute, Bogor. The data are compared to the standard of maximum residue levels (MRL) of pesticides in agricultural products. Results show that residual pesticides in treated soils are below the detection limit of the GC equipment, except malathion is detected with values ranging from 0.039-0.050 ppm. However, residual organophosphate pesticides in the bulbs are mainly below the maximum residue levels. The only exception is chlorpyrifos which has a value above the maximum residue levels of pesticides (0.076 ppm). Farmers should be educated in integrated pest management and applying synthetic pesticides as the last option for controlling pests and diseases.
{"title":"The Effect of Soil Submersion and Conditioner Materials on Residual Organophosphate Pesticides in Soil and Shallot Bulbs","authors":"Ubad Badrudin, Syakiroh Jazilah, B. Prakoso","doi":"10.17503/agrivita.v41i0.1291","DOIUrl":"https://doi.org/10.17503/agrivita.v41i0.1291","url":null,"abstract":"Soil health decreases and residual pesticides increase due to the application of inorganic fertilizers and pesticides continuously during the cultivation of crops. The effect of 12 hours or 24 hours soil submersion and chicken litters or zeolite application before planting on residual pesticides in soil and bulbs of shallots (Allium ascalonicum L.) are studied. Samples of soils and bulbs have proceeded after shallot cultivation conducted in Brebes, Indonesia. Then organophosphate residues in the samples are analyzed using gas chromatography in the Laboratory of the Indonesian Agricultural Environment Research Institute, Bogor. The data are compared to the standard of maximum residue levels (MRL) of pesticides in agricultural products. Results show that residual pesticides in treated soils are below the detection limit of the GC equipment, except malathion is detected with values ranging from 0.039-0.050 ppm. However, residual organophosphate pesticides in the bulbs are mainly below the maximum residue levels. The only exception is chlorpyrifos which has a value above the maximum residue levels of pesticides (0.076 ppm). Farmers should be educated in integrated pest management and applying synthetic pesticides as the last option for controlling pests and diseases.","PeriodicalId":44658,"journal":{"name":"Agrivita","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47787112","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}
Pub Date : 2022-02-01DOI: 10.17503/agrivita.v44i1.3058
Kunto Wibisono, S. Aisyah, W. Nurcholis, S. Suhesti
Mutation induction by colchicine is one method to improve plant genetic diversity (polyploidy). This study aims to 1) obtain growth regulators composition suitable in inducing callus, 2) obtain the LC50 value in callus of P. amboinicus, 3) to determine the effect of colchicine on callus growth, 4) to get shoots (putative mutant) varian, regenerating from indirect organogenesis (callus) in MV1. The study is conducted at the Laboratory of Agricultural Seed Management, Plantation Research, and Development Center from June 2018 to June 2019. The study uses a complete randomized design with four treatments and three replications. Explants use ware the nodes. Callus induction uses MS0 medium with 0.5 ppm 2.4-D, 2 ppm 2.4-D, 0.5 ppm 2.4-D + 1 ppm BAP, and 0.5 ppm 2.4-D + 0.5 ppm TDZ treatment. Mutation induction was performed using colchicine concentration at 0%, 0.02%, 0.04%, and 0.06% treatments. The regeneration media is an MS0 medium. The results show the best combination of plant growth regulators to induce the callus is 0.5 ppm 2.4-D. The LC50 colchicine concentration is at 0.0275%. However, this phenotype is reversible. An additional subculture period is required to move to normal morphology
{"title":"Sensitivity in Callus Tissue of Plectranthus amboinicus (L.) through Mutation Induction with Colchicine","authors":"Kunto Wibisono, S. Aisyah, W. Nurcholis, S. Suhesti","doi":"10.17503/agrivita.v44i1.3058","DOIUrl":"https://doi.org/10.17503/agrivita.v44i1.3058","url":null,"abstract":"Mutation induction by colchicine is one method to improve plant genetic diversity (polyploidy). This study aims to 1) obtain growth regulators composition suitable in inducing callus, 2) obtain the LC50 value in callus of P. amboinicus, 3) to determine the effect of colchicine on callus growth, 4) to get shoots (putative mutant) varian, regenerating from indirect organogenesis (callus) in MV1. The study is conducted at the Laboratory of Agricultural Seed Management, Plantation Research, and Development Center from June 2018 to June 2019. The study uses a complete randomized design with four treatments and three replications. Explants use ware the nodes. Callus induction uses MS0 medium with 0.5 ppm 2.4-D, 2 ppm 2.4-D, 0.5 ppm 2.4-D + 1 ppm BAP, and 0.5 ppm 2.4-D + 0.5 ppm TDZ treatment. Mutation induction was performed using colchicine concentration at 0%, 0.02%, 0.04%, and 0.06% treatments. The regeneration media is an MS0 medium. The results show the best combination of plant growth regulators to induce the callus is 0.5 ppm 2.4-D. The LC50 colchicine concentration is at 0.0275%. However, this phenotype is reversible. An additional subculture period is required to move to normal morphology","PeriodicalId":44658,"journal":{"name":"Agrivita","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46798348","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}
Pub Date : 2022-02-01DOI: 10.17503/agrivita.v44i1.2847
A. Setiawan, S. Ito, Y. Mitsuda, R. Hirata, Kiwamu Yamagishi, Yasa Palaguna Umar, Ichiro Kamei
We examined the effect of watering and shading treatments on eugenol productivity of clove seedlings in order to provide the information of the suitable site conditions for eugenol production. After a six-month experiment growing clove seedlings under twelve treatments (3 shading treatments (0%, 60% and 80%) x 4 watering treatments (1.0, 0.75, 0.5 and 0.25 l/m2/day), the total leaf mass per tree (LM), the eugenol content per unit leaf mass (EL) and the eugenol yield per tree (EY) were measured and compared between treatments. As the results, the low watering rates reduced LM slightly; however, this effect was counteracted by the drastically increased EL under the same conditions, resulting in the highest EY in the least watered treatment (0.25 l/m2/day). Heavy shading consistently reduced LM and EL, resulting in the lowest LY under the 80% shading treatment. The relatively dryer site condition where moderate water stress is likely to occur is more suitable for planting clove trees from the aspect of the for long-term high productivity of eugenol, and that the high tree density which may cause a severe competition and a heavy mutual shading among clove trees should be avoided to maintain long term high productivity.
{"title":"Productivity of Eugenol from Clove (Syzygium aromaticum L.) Under Different Light and Soil Water Conditions","authors":"A. Setiawan, S. Ito, Y. Mitsuda, R. Hirata, Kiwamu Yamagishi, Yasa Palaguna Umar, Ichiro Kamei","doi":"10.17503/agrivita.v44i1.2847","DOIUrl":"https://doi.org/10.17503/agrivita.v44i1.2847","url":null,"abstract":"We examined the effect of watering and shading treatments on eugenol productivity of clove seedlings in order to provide the information of the suitable site conditions for eugenol production. After a six-month experiment growing clove seedlings under twelve treatments (3 shading treatments (0%, 60% and 80%) x 4 watering treatments (1.0, 0.75, 0.5 and 0.25 l/m2/day), the total leaf mass per tree (LM), the eugenol content per unit leaf mass (EL) and the eugenol yield per tree (EY) were measured and compared between treatments. As the results, the low watering rates reduced LM slightly; however, this effect was counteracted by the drastically increased EL under the same conditions, resulting in the highest EY in the least watered treatment (0.25 l/m2/day). Heavy shading consistently reduced LM and EL, resulting in the lowest LY under the 80% shading treatment. The relatively dryer site condition where moderate water stress is likely to occur is more suitable for planting clove trees from the aspect of the for long-term high productivity of eugenol, and that the high tree density which may cause a severe competition and a heavy mutual shading among clove trees should be avoided to maintain long term high productivity.","PeriodicalId":44658,"journal":{"name":"Agrivita","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48720671","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}
Pub Date : 2022-02-01DOI: 10.17503/agrivita.v44i1.3065
Prem Kumar Selvarajan, S. Gandaseca, Kamziah Abd. Kudus, K. Wicaksono
The objective of this study was to examine the effects of four different elevations on Acacia mangium volume in Bintulu, Sarawak. A total of 60 felled trees of A. mangium were used to develop a volume equation by measuring the volume at four different classes of elevation. The study of stand volume estimation in Malaysian plantations, particularly in Bintulu, is sparse. To get the average cross-sectional area, the volume of each tree in each part of the felled trees was estimated using Smalian’s and Newton’s formulas. Four equations were developed in this study to predict the volume from the diameter and analyze the effect of elevation on tree volume. According to the regression analysis, there was a significant relationship between the volume and diameter for each slope steepness. The Very Slope site had the highest volume with an R² value of 0.948 for the model’s fit, which revealed that 94.8% of the data could be evaded. Volume estimation using the regression model can be used to determine and categorize according to its class of elevation, and there is an effect of elevation on standing volume. A. mangium has better growth performance in a very slope area in terms of tree volume compared to different elevations.
{"title":"Elevation Effect on Acacia mangium Volume Estimation","authors":"Prem Kumar Selvarajan, S. Gandaseca, Kamziah Abd. Kudus, K. Wicaksono","doi":"10.17503/agrivita.v44i1.3065","DOIUrl":"https://doi.org/10.17503/agrivita.v44i1.3065","url":null,"abstract":"The objective of this study was to examine the effects of four different elevations on Acacia mangium volume in Bintulu, Sarawak. A total of 60 felled trees of A. mangium were used to develop a volume equation by measuring the volume at four different classes of elevation. The study of stand volume estimation in Malaysian plantations, particularly in Bintulu, is sparse. To get the average cross-sectional area, the volume of each tree in each part of the felled trees was estimated using Smalian’s and Newton’s formulas. Four equations were developed in this study to predict the volume from the diameter and analyze the effect of elevation on tree volume. According to the regression analysis, there was a significant relationship between the volume and diameter for each slope steepness. The Very Slope site had the highest volume with an R² value of 0.948 for the model’s fit, which revealed that 94.8% of the data could be evaded. Volume estimation using the regression model can be used to determine and categorize according to its class of elevation, and there is an effect of elevation on standing volume. A. mangium has better growth performance in a very slope area in terms of tree volume compared to different elevations.","PeriodicalId":44658,"journal":{"name":"Agrivita","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48524820","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}
Pub Date : 2021-10-01DOI: 10.17503/agrivita.v43i3.2680
Julio Muñoz-Rengifo, J. A. Rojas, R. Villamar-Torres, J. Reyes-Pérez, S. M. Jazayeri
The present research was aimed to evaluate the effectiveness of attractants placed in craft traps to reduce the bit population (Hypothenemus hampei). Three different mixtures of attractants and control were used in craft traps (4 treatments, which represent the mixtures frequently used by Amazonian coffee growers), arranged in a completely random blocks design. The variable number adult coffee drill was analyzed, as well as the most economical and effective treatment in the capture of adult coffee bit. The data were processed by means of a variance analysis to determine the differences between treatments, and the Tukey media multiple comparison test, at the statistical significance of p<0.05. The results have confirmed that the use of craft traps is a good alternative for adult coffee bit control. The treatment that allowed a greater capture of the coffee bits was T1 (mixture of 2 liters of boiled water + 200 grams of ground coffee), this was also the treatment that had the lowest cost for the elaboration of the artisan trap ($ 14.30). Finally, T1 turned out to be the most effective treatment for adult coffee drill capture in Amazonian conditions of Ecuador. In their study bit capture, ethyl
{"title":"Effectiveness of Using Attractants to Control Hypothenemus hampei in Coffea arabica Crop in the Ecuadorian Amazon","authors":"Julio Muñoz-Rengifo, J. A. Rojas, R. Villamar-Torres, J. Reyes-Pérez, S. M. Jazayeri","doi":"10.17503/agrivita.v43i3.2680","DOIUrl":"https://doi.org/10.17503/agrivita.v43i3.2680","url":null,"abstract":"The present research was aimed to evaluate the effectiveness of attractants placed in craft traps to reduce the bit population (Hypothenemus hampei). Three different mixtures of attractants and control were used in craft traps (4 treatments, which represent the mixtures frequently used by Amazonian coffee growers), arranged in a completely random blocks design. The variable number adult coffee drill was analyzed, as well as the most economical and effective treatment in the capture of adult coffee bit. The data were processed by means of a variance analysis to determine the differences between treatments, and the Tukey media multiple comparison test, at the statistical significance of p<0.05. The results have confirmed that the use of craft traps is a good alternative for adult coffee bit control. The treatment that allowed a greater capture of the coffee bits was T1 (mixture of 2 liters of boiled water + 200 grams of ground coffee), this was also the treatment that had the lowest cost for the elaboration of the artisan trap ($ 14.30). Finally, T1 turned out to be the most effective treatment for adult coffee drill capture in Amazonian conditions of Ecuador. In their study bit capture, ethyl","PeriodicalId":44658,"journal":{"name":"Agrivita","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43053689","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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