Pub Date : 2021-06-01DOI: 10.1590/1807-1929/AGRIAMBI.V25N6P415-421
C. M. D. Silva, J. A. Frizzone, Luiz F. M. da Silva, Y. A. D. O. Santos, A. Golynski, N. Pontes
HIGHLIGHTS The number of flowers, the abortion rate, and the number of fruits per flower cluster directly influence processing tomato yield. Deficient or excessive irrigation levels impair flowering and increase the abortion of flowers of the processing tomato. Irrigation management is essential for the yield of processing tomato crops from the Brazilian Cerrado.
{"title":"Flower abortion and yield of processing tomato according to irrigation depths","authors":"C. M. D. Silva, J. A. Frizzone, Luiz F. M. da Silva, Y. A. D. O. Santos, A. Golynski, N. Pontes","doi":"10.1590/1807-1929/AGRIAMBI.V25N6P415-421","DOIUrl":"https://doi.org/10.1590/1807-1929/AGRIAMBI.V25N6P415-421","url":null,"abstract":"HIGHLIGHTS The number of flowers, the abortion rate, and the number of fruits per flower cluster directly influence processing tomato yield. Deficient or excessive irrigation levels impair flowering and increase the abortion of flowers of the processing tomato. Irrigation management is essential for the yield of processing tomato crops from the Brazilian Cerrado.","PeriodicalId":51288,"journal":{"name":"Revista Brasileira de Engenharia Agricola e Ambiental","volume":"17 1","pages":"415-421"},"PeriodicalIF":1.2,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82515579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-01DOI: 10.1590/1807-1929/AGRIAMBI.V25N6P372-379
F. Sá, Ivan D. F. Silva, M. Ferreira Neto, Yuri Bezerra de Lima, E. Paiva, H. Gheyi
HIGHLIGHTS Irrigation using water with electrical conductivity above 2.5 dS m-1 is not adequate for ‘Paulistinha’ cowpea. Increment in phosphorus dose does not increase phosphorus content in cowpea plant. Under salt stress conditions, cowpea plants require lower doses of phosphorus.
{"title":"Phosphorus doses alter the ionic homeostasis of cowpea irrigated with saline water","authors":"F. Sá, Ivan D. F. Silva, M. Ferreira Neto, Yuri Bezerra de Lima, E. Paiva, H. Gheyi","doi":"10.1590/1807-1929/AGRIAMBI.V25N6P372-379","DOIUrl":"https://doi.org/10.1590/1807-1929/AGRIAMBI.V25N6P372-379","url":null,"abstract":"HIGHLIGHTS Irrigation using water with electrical conductivity above 2.5 dS m-1 is not adequate for ‘Paulistinha’ cowpea. Increment in phosphorus dose does not increase phosphorus content in cowpea plant. Under salt stress conditions, cowpea plants require lower doses of phosphorus.","PeriodicalId":51288,"journal":{"name":"Revista Brasileira de Engenharia Agricola e Ambiental","volume":"12 1","pages":"372-379"},"PeriodicalIF":1.2,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73028609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-01DOI: 10.1590/1807-1929/AGRIAMBI.V25N6P380-385
A. D. Silva, Simara S. Melo, B. Umbelino, F. Sá, N. S. Dias, M. Ferreira Neto
This study aimed to evaluate the effect of irrigation with saline effluent from fish farming in different phenological stages on fruit production and seed vigor of cherry tomato. The experiment was conducted in a greenhouse in Mossoró, RN, Brazil, using a completely randomized design with 10 treatments, which consisted of the use of fish farming effluent with electrical conductivity (EC) of 4.54 dS m-1 and public-supply water with EC of 0.54 dS m-1, alternated during four phenological stages (growth from 1 to 19 days after transplantation (DAT), flowering from 20 to 31 DAT, fruit filling from 32 to 60 DAT and maturation from 61 to 77 DAT). Application of saline effluent from fish farming throughout a phenological stage of cherry tomato does not reduce fruit production per bunch, but reduces seed production and the vigor of the seeds produced. The use of saline effluent from fish farming in the initial and maturation stages, and the use of effluent with two successive applications, alternated with irrigation with low salinity water, are favorable for the production of cherry tomato seeds with satisfactory vigor. Alternated application of saline effluent from fish farming, with two subsequent successive irrigations with low-salinity water, despite reducing seed production, favors the production of seeds with high vigor. The use of saline effluent from fish farming in the flowering and fruiting stages reduces seed production and the vigor of the seeds produced.
本研究旨在评价不同物候期养鱼盐水出水灌溉对樱桃番茄果实产量和种子活力的影响。Mossoro实验是在温室进行,RN,巴西,使用一个完全随机设计10治疗,包括使用的鱼类养殖废水的电导率(EC) dS 4.54 m - 1与EC dS 0.54 m - 1和城市供应水,交替在四个物候阶段(移植后增长从1到19天(DAT),从20 - 31 DAT开花,水果馅从32到60 DAT和成熟从61年到77年DAT)。在整个樱桃番茄物候期施用养鱼产生的含盐废水不会减少每束果实的产量，但会减少种子的产量和种子的活力。在养鱼初期和成熟阶段使用含盐废水，连续两次使用含盐废水，交替使用低盐度水灌溉，有利于生产具有良好活力的樱桃番茄种子。交替施用鱼类养殖的含盐废水，随后连续两次用低盐度水灌溉，尽管减少了种子产量，但有利于高产种子。在开花期和结实期使用鱼类养殖的含盐废水会减少种子的产量和产生的种子的活力。
{"title":"Cherry tomato production and seed vigor under irrigation with saline effluent from fish farming","authors":"A. D. Silva, Simara S. Melo, B. Umbelino, F. Sá, N. S. Dias, M. Ferreira Neto","doi":"10.1590/1807-1929/AGRIAMBI.V25N6P380-385","DOIUrl":"https://doi.org/10.1590/1807-1929/AGRIAMBI.V25N6P380-385","url":null,"abstract":"This study aimed to evaluate the effect of irrigation with saline effluent from fish farming in different phenological stages on fruit production and seed vigor of cherry tomato. The experiment was conducted in a greenhouse in Mossoró, RN, Brazil, using a completely randomized design with 10 treatments, which consisted of the use of fish farming effluent with electrical conductivity (EC) of 4.54 dS m-1 and public-supply water with EC of 0.54 dS m-1, alternated during four phenological stages (growth from 1 to 19 days after transplantation (DAT), flowering from 20 to 31 DAT, fruit filling from 32 to 60 DAT and maturation from 61 to 77 DAT). Application of saline effluent from fish farming throughout a phenological stage of cherry tomato does not reduce fruit production per bunch, but reduces seed production and the vigor of the seeds produced. The use of saline effluent from fish farming in the initial and maturation stages, and the use of effluent with two successive applications, alternated with irrigation with low salinity water, are favorable for the production of cherry tomato seeds with satisfactory vigor. Alternated application of saline effluent from fish farming, with two subsequent successive irrigations with low-salinity water, despite reducing seed production, favors the production of seeds with high vigor. The use of saline effluent from fish farming in the flowering and fruiting stages reduces seed production and the vigor of the seeds produced.","PeriodicalId":51288,"journal":{"name":"Revista Brasileira de Engenharia Agricola e Ambiental","volume":"38 1","pages":"380-385"},"PeriodicalIF":1.2,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85248608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-01DOI: 10.1590/1807-1929/AGRIAMBI.V25N5P305-311
P. Goergen, I. Lago, N. T. Schwab, A. F. Alves, C. P. D. O. Freitas, Verlaine S. Selli
This study aimed to obtain equations to estimate leaf area from linear leaf dimensions and establish the allometric relationship between leaf area and the number of leaves on the main stem of chia (Salvia hispanica L.) at different sowing times. The experiment was conducted in the agricultural year 2016/2017 on five sowing times in Santa Maria, RS, Brazil, in a randomized block design with four repetitions. In each plot, ten random plants were marked weekly during the vegetative phase to determine the number of leaves (NL) in the main stem, and three of these for the determination of leaf area (LA). A total of 70 leaves of different sizes were used to calibrate the model. Another 106 leaves were used to test the predictive capacity of the equations by various statistical indices. The length (L) and the largest leaf width (W) were measured. Leaf collection was carried out during the cycle, in all sowing times to represent all leaf sizes. The linear, quadratic, exponential, and potential models were adjusted. The non-destructive method, through the linear dimensions of the leaf, is appropriate for estimating the leaf area in chia. The general equation LA = 0.642 (L x W) can be used to estimate the leaf area of the chia plants without loss of precision. The potential model is appropriate to characterize the allometric relationship between leaf area evolution and the number of leaves accumulated in the main stem of chia at different sowing times.
本研究旨在建立不同播期鼠尾草(chia (Salvia hispanica L.))叶面积与主茎叶数之间的异速生长关系。试验于2016/2017农业年在巴西RS Santa Maria进行5次播种，采用随机区组设计，重复4次。在每个样地，每周随机标记10株植物，以确定主茎叶数(NL)，其中3株用于测定叶面积(LA)。总共使用了70片不同大小的叶片来校准模型。另外用106个叶片通过各种统计指标检验方程的预测能力。测定叶片长度(L)和最大叶宽(W)。叶片收集在整个周期内进行，在所有播种期进行，以代表所有叶片大小。调整了线性、二次、指数和势模型。通过叶片的线性尺寸来估算叶片面积的非破坏性方法是合适的。一般公式LA = 0.642 (L x W)可用于估算奇亚植物叶面积，且精度不降低。势模型可以较好地描述不同播期下叶面积演变与主茎叶累积数之间的异速生长关系。
{"title":"Allometric relationship and leaf area modeling estimation on chia by non-destructive method","authors":"P. Goergen, I. Lago, N. T. Schwab, A. F. Alves, C. P. D. O. Freitas, Verlaine S. Selli","doi":"10.1590/1807-1929/AGRIAMBI.V25N5P305-311","DOIUrl":"https://doi.org/10.1590/1807-1929/AGRIAMBI.V25N5P305-311","url":null,"abstract":"This study aimed to obtain equations to estimate leaf area from linear leaf dimensions and establish the allometric relationship between leaf area and the number of leaves on the main stem of chia (Salvia hispanica L.) at different sowing times. The experiment was conducted in the agricultural year 2016/2017 on five sowing times in Santa Maria, RS, Brazil, in a randomized block design with four repetitions. In each plot, ten random plants were marked weekly during the vegetative phase to determine the number of leaves (NL) in the main stem, and three of these for the determination of leaf area (LA). A total of 70 leaves of different sizes were used to calibrate the model. Another 106 leaves were used to test the predictive capacity of the equations by various statistical indices. The length (L) and the largest leaf width (W) were measured. Leaf collection was carried out during the cycle, in all sowing times to represent all leaf sizes. The linear, quadratic, exponential, and potential models were adjusted. The non-destructive method, through the linear dimensions of the leaf, is appropriate for estimating the leaf area in chia. The general equation LA = 0.642 (L x W) can be used to estimate the leaf area of the chia plants without loss of precision. The potential model is appropriate to characterize the allometric relationship between leaf area evolution and the number of leaves accumulated in the main stem of chia at different sowing times.","PeriodicalId":51288,"journal":{"name":"Revista Brasileira de Engenharia Agricola e Ambiental","volume":"22 1","pages":"305-311"},"PeriodicalIF":1.2,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77116701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-01DOI: 10.1590/1807-1929/AGRIAMBI.V25N5P353-358
J. G. Silva, G. I. Gadotti, D. M. Moraes, Augusto H. M. Silva, J. A. Cavalcante, G. Meneghello
The adoption of quick and reliable laboratory techniques and equipment to choose the best seed lots for marketing will influence the production of soybeans with superior physiological quality, among other areas in the sector. Therefore, the objective of this study was to evaluate the CO2 concentrations produced by water-soaked soybean seeds and to verify the effectiveness of new equipment to help choose lots with different vigor levels. To evaluate the physical and physiological quality of the seeds, eight soybean lots were evaluated with the following tests: water content, weight of thousand seeds, first germination count, germination, electrical conductivity, emergence, and respiration evaluated by the Pettenkoffer apparatus and with equipment designed to measure CO2 in seeds. The results were subjected to analysis of variance with means compared by Tukey’s test at p ≤ 0.05. Conventional methods showed significant differences in vigor and viability in soybean seeds. The equipment designed was efficient in detecting CO2 produced by seeds soaked in water for 8 hours. The CO2 readings with the equipment presented satisfactory results to predict the vigor in soybean seeds through respiration.
{"title":"Equipment to assess vigor in soybean seeds using CO2 produced during respiration","authors":"J. G. Silva, G. I. Gadotti, D. M. Moraes, Augusto H. M. Silva, J. A. Cavalcante, G. Meneghello","doi":"10.1590/1807-1929/AGRIAMBI.V25N5P353-358","DOIUrl":"https://doi.org/10.1590/1807-1929/AGRIAMBI.V25N5P353-358","url":null,"abstract":"The adoption of quick and reliable laboratory techniques and equipment to choose the best seed lots for marketing will influence the production of soybeans with superior physiological quality, among other areas in the sector. Therefore, the objective of this study was to evaluate the CO2 concentrations produced by water-soaked soybean seeds and to verify the effectiveness of new equipment to help choose lots with different vigor levels. To evaluate the physical and physiological quality of the seeds, eight soybean lots were evaluated with the following tests: water content, weight of thousand seeds, first germination count, germination, electrical conductivity, emergence, and respiration evaluated by the Pettenkoffer apparatus and with equipment designed to measure CO2 in seeds. The results were subjected to analysis of variance with means compared by Tukey’s test at p ≤ 0.05. Conventional methods showed significant differences in vigor and viability in soybean seeds. The equipment designed was efficient in detecting CO2 produced by seeds soaked in water for 8 hours. The CO2 readings with the equipment presented satisfactory results to predict the vigor in soybean seeds through respiration.","PeriodicalId":51288,"journal":{"name":"Revista Brasileira de Engenharia Agricola e Ambiental","volume":"42 2 1","pages":"353-358"},"PeriodicalIF":1.2,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90475692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-01DOI: 10.1590/1807-1929/AGRIAMBI.V25N5P312-318
Edvaldo B. Santana Júnior, E. F. Coelho, M. R. D. Santos, A. Silva, J. Reis, B. L. D. S. Pereira
Information on soil hydrodynamic processes assists in explaining the soil-water-plant relationship and has practical applications to irrigation management, such as the definition of soil water sensor placement. The objective of this study was to detail the hydrodynamic process in the soil root zone and to define the location for placement of soil water sensor under different configurations of trickle irrigation in banana crops. Three microsprinkler emitters with flow rates of 70 (T1), 53 (T2), 35 L h-1 (T3), and two drip system, one with one drip line per row of plants (T4), and another with two drip lines per row of plants (T5) were evaluated. The experiment was conducted in a randomized block design with five repetitions. Higher water extraction was found for irrigation systems with higher flow rates for all configurations of trickle irrigation systems. Soil moisture sensors in drip systems should be placed at distances of 0.75 to 0.81 m from the pseudo stem and at depths of 0.33 to 0.44 m. Under micro-sprinkler systems, soil water sensors should be placed at 0.75, 0.77 and 0.83 m from the pseudo stem towards to the emitter and at depths of 0.33, 0.48 and 0.55 m for emitter flow rates of 35, 53 and 70 L h-1, respectively.
关于土壤水动力过程的信息有助于解释土壤-水-植物关系，并在灌溉管理中有实际应用，例如土壤水传感器放置的定义。本研究的目的是详细描述香蕉作物不同滴灌配置下土壤根区水动力过程，并确定土壤水分传感器的放置位置。对流量分别为70 (T1)、53 (T2)、35 L h-1 (T3)的3种微喷头和两种滴灌系统进行了评价，一种为每行1条滴灌管(T4)，另一种为每行2条滴灌管(T5)。实验采用随机区组设计，重复5次。在滴灌系统的所有配置中，高流量的灌溉系统都有较高的出水量。滴灌系统中的土壤湿度传感器应放置在距离假茎0.75至0.81米的地方，深度为0.33至0.44米。在微型喷灌系统中，当喷灌流量分别为35、53和70 L h-1时，土壤水分传感器应放置在距离假茎向喷灌方向0.75、0.77和0.83 m处，深度分别为0.33、0.48和0.55 m。
{"title":"Management of trickle irrigation for banana: Hydrodynamic processes and sensor placement at the root zone","authors":"Edvaldo B. Santana Júnior, E. F. Coelho, M. R. D. Santos, A. Silva, J. Reis, B. L. D. S. Pereira","doi":"10.1590/1807-1929/AGRIAMBI.V25N5P312-318","DOIUrl":"https://doi.org/10.1590/1807-1929/AGRIAMBI.V25N5P312-318","url":null,"abstract":"Information on soil hydrodynamic processes assists in explaining the soil-water-plant relationship and has practical applications to irrigation management, such as the definition of soil water sensor placement. The objective of this study was to detail the hydrodynamic process in the soil root zone and to define the location for placement of soil water sensor under different configurations of trickle irrigation in banana crops. Three microsprinkler emitters with flow rates of 70 (T1), 53 (T2), 35 L h-1 (T3), and two drip system, one with one drip line per row of plants (T4), and another with two drip lines per row of plants (T5) were evaluated. The experiment was conducted in a randomized block design with five repetitions. Higher water extraction was found for irrigation systems with higher flow rates for all configurations of trickle irrigation systems. Soil moisture sensors in drip systems should be placed at distances of 0.75 to 0.81 m from the pseudo stem and at depths of 0.33 to 0.44 m. Under micro-sprinkler systems, soil water sensors should be placed at 0.75, 0.77 and 0.83 m from the pseudo stem towards to the emitter and at depths of 0.33, 0.48 and 0.55 m for emitter flow rates of 35, 53 and 70 L h-1, respectively.","PeriodicalId":51288,"journal":{"name":"Revista Brasileira de Engenharia Agricola e Ambiental","volume":"359 1","pages":"312-318"},"PeriodicalIF":1.2,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78955985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-01DOI: 10.1590/1807-1929/AGRIAMBI.V25N4P235-242
A. R. Kraisig, J. G. D. Silva, L. M. Pereira, R. Carbonera, I. Carvalho, N. Basso
The efficiency of nitrogen use by wheat crop depends on genetic and environmental stimuli. The aim of this study was to evaluate the efficiency of nitrogen use by wheat crop, through biomass, productivity and grain quality indicators, as a function of the genotype and previous harvest, in Southern Brazil cereal cultivation systems. The experiments were conducted in soybean/wheat and maize/wheat systems during 2015, 2016, and 2017 in Augusto Pestana, RS, Brazil. The experimental design was a randomized block with four repetitions, following a 5 × 4 factorial scheme, referring to five wheat cultivars (Quartzo, TBIO Sinuelo, TBIO Sintonia, TEC 10 and TEC Vigore) and four nitrogen doses (0, 60, 120 and 180 kg ha-1) applied as a topdressing during the phenological stage of the expanded third leaf, stage 13. There were genetic differences in nitrogen use efficiency, for the productivity (yield and biomass) and quality of wheat. However, these genetic differences were influenced by the carbon:nitrogen ratios of the previous crop. Quartzo and TBIO Sinuelo had the greatest nitrogen use efficiency for grain yield, TBIO Sinuelo had the greatest nitrogen use efficiency for biomass production and Quartzo had the greatest nitrogen use efficiency for grain quality with expectation of 3 Mg ha-1, regardless of the succession system, in the joint analysis of agricultural years.
{"title":"Efficiency of nitrogen use by wheat depending on genotype and previous crop","authors":"A. R. Kraisig, J. G. D. Silva, L. M. Pereira, R. Carbonera, I. Carvalho, N. Basso","doi":"10.1590/1807-1929/AGRIAMBI.V25N4P235-242","DOIUrl":"https://doi.org/10.1590/1807-1929/AGRIAMBI.V25N4P235-242","url":null,"abstract":"The efficiency of nitrogen use by wheat crop depends on genetic and environmental stimuli. The aim of this study was to evaluate the efficiency of nitrogen use by wheat crop, through biomass, productivity and grain quality indicators, as a function of the genotype and previous harvest, in Southern Brazil cereal cultivation systems. The experiments were conducted in soybean/wheat and maize/wheat systems during 2015, 2016, and 2017 in Augusto Pestana, RS, Brazil. The experimental design was a randomized block with four repetitions, following a 5 × 4 factorial scheme, referring to five wheat cultivars (Quartzo, TBIO Sinuelo, TBIO Sintonia, TEC 10 and TEC Vigore) and four nitrogen doses (0, 60, 120 and 180 kg ha-1) applied as a topdressing during the phenological stage of the expanded third leaf, stage 13. There were genetic differences in nitrogen use efficiency, for the productivity (yield and biomass) and quality of wheat. However, these genetic differences were influenced by the carbon:nitrogen ratios of the previous crop. Quartzo and TBIO Sinuelo had the greatest nitrogen use efficiency for grain yield, TBIO Sinuelo had the greatest nitrogen use efficiency for biomass production and Quartzo had the greatest nitrogen use efficiency for grain quality with expectation of 3 Mg ha-1, regardless of the succession system, in the joint analysis of agricultural years.","PeriodicalId":51288,"journal":{"name":"Revista Brasileira de Engenharia Agricola e Ambiental","volume":"61 1","pages":"235-242"},"PeriodicalIF":1.2,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83029460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-01DOI: 10.1590/1807-1929/AGRIAMBI.V25N4P270-276
M. Carvalho, E. Hickel, Bruno Bertoldi, G. Knabben, Y. R. D. Novaes
This study aimed to present the design and field test results of an LED (light emitting diode) lamp for integrated pest management (IPM) and other entomological studies. The light spectrum of the LEDs was tuned to optimize insect attraction and lower energy consumption. An electronic circuit with control software was integrated with the lamp, enabling it to operate in standalone mode, automatically identify night and day, monitor and control the battery charge with energy from a photovoltaic solar panel, protect the battery against over-discharge, and provide feedback about the operating status of the system. Additionally, energy consumption is about five times lower than that of the fluorescent lamp, reducing the battery and solar panel size needed for its energy supply. In the 2017/2018 growing season, the smart LED lamp was installed in a Sonne light trap in an irrigated rice field, and the total number of insects captured was compared with the number collected in a conventional light trap fitted with a traditional 15 W black light fluorescent lamp. Total captures in the Sonne trap were approximately three times greater than in the conventional system.
{"title":"Design of a smart LED lamp to monitor insect populations in an integrated pest management approach","authors":"M. Carvalho, E. Hickel, Bruno Bertoldi, G. Knabben, Y. R. D. Novaes","doi":"10.1590/1807-1929/AGRIAMBI.V25N4P270-276","DOIUrl":"https://doi.org/10.1590/1807-1929/AGRIAMBI.V25N4P270-276","url":null,"abstract":"This study aimed to present the design and field test results of an LED (light emitting diode) lamp for integrated pest management (IPM) and other entomological studies. The light spectrum of the LEDs was tuned to optimize insect attraction and lower energy consumption. An electronic circuit with control software was integrated with the lamp, enabling it to operate in standalone mode, automatically identify night and day, monitor and control the battery charge with energy from a photovoltaic solar panel, protect the battery against over-discharge, and provide feedback about the operating status of the system. Additionally, energy consumption is about five times lower than that of the fluorescent lamp, reducing the battery and solar panel size needed for its energy supply. In the 2017/2018 growing season, the smart LED lamp was installed in a Sonne light trap in an irrigated rice field, and the total number of insects captured was compared with the number collected in a conventional light trap fitted with a traditional 15 W black light fluorescent lamp. Total captures in the Sonne trap were approximately three times greater than in the conventional system.","PeriodicalId":51288,"journal":{"name":"Revista Brasileira de Engenharia Agricola e Ambiental","volume":"14 1","pages":"270-276"},"PeriodicalIF":1.2,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88502247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-01DOI: 10.1590/1807-1929/AGRIAMBI.V25N4P228-234
G. P. Santos, W. E. Pereira, R. D. L. S. D. Lima, J. F. D. Brito Neto, B. O. Dias, T. J. Dias
ABSTRACT The low soil fertility associated with the lack of adequate irrigation management are factors that most limit crop production. Therefore, the study aimed to evaluate the chemical attributes of an Oxisol and the yield of ‘Paluma’ guava under irrigation with saline water and fertilized with phosphorus, cattle manure, and boron. The treatments were distributed in randomized blocks, with four repetitions and two plants per plot, including borders on the sides of the useful experimental area, arranged in a factorial scheme (5 × 2) + 1, referring to five phosphorus doses (0, 0.08, 0.16, 0.24 and 0.32 kg of P2O5 plant-1), two doses of cattle manure, 0 and 30 kg per plant and an additional treatment consisting of 0.16 kg of P2O5 plus 30 kg of cattle manure and 1.0 g of boron, using as source the borax. In the soil, pH, phosphorus, potassium, calcium, magnesium, and the cation exchange capacity were evaluated in the 0-20 cm and 20-40 cm layers. In plants, the average yield per hectare in two harvests was estimated. The pH decreased with phosphorus doses without cattle manure and in the treatment with boron in the 20-40 cm layer. The cation exchange capacity increased with the application of phosphorus doses associated with manure and decreased in both soil layers with boron. The macronutrients evaluated were not influenced by boron. Phosphorus doses associated with cattle manure increased yield, exceeding the average of 50 t ha-1 year-1 determined for ‘Paluma’ guava. In contrast, boron did not increased the yield.
{"title":"Soil fertility and yield of ‘Paluma’ guava fertilized with phosphorus, cattle manure, and boron","authors":"G. P. Santos, W. E. Pereira, R. D. L. S. D. Lima, J. F. D. Brito Neto, B. O. Dias, T. J. Dias","doi":"10.1590/1807-1929/AGRIAMBI.V25N4P228-234","DOIUrl":"https://doi.org/10.1590/1807-1929/AGRIAMBI.V25N4P228-234","url":null,"abstract":"ABSTRACT The low soil fertility associated with the lack of adequate irrigation management are factors that most limit crop production. Therefore, the study aimed to evaluate the chemical attributes of an Oxisol and the yield of ‘Paluma’ guava under irrigation with saline water and fertilized with phosphorus, cattle manure, and boron. The treatments were distributed in randomized blocks, with four repetitions and two plants per plot, including borders on the sides of the useful experimental area, arranged in a factorial scheme (5 × 2) + 1, referring to five phosphorus doses (0, 0.08, 0.16, 0.24 and 0.32 kg of P2O5 plant-1), two doses of cattle manure, 0 and 30 kg per plant and an additional treatment consisting of 0.16 kg of P2O5 plus 30 kg of cattle manure and 1.0 g of boron, using as source the borax. In the soil, pH, phosphorus, potassium, calcium, magnesium, and the cation exchange capacity were evaluated in the 0-20 cm and 20-40 cm layers. In plants, the average yield per hectare in two harvests was estimated. The pH decreased with phosphorus doses without cattle manure and in the treatment with boron in the 20-40 cm layer. The cation exchange capacity increased with the application of phosphorus doses associated with manure and decreased in both soil layers with boron. The macronutrients evaluated were not influenced by boron. Phosphorus doses associated with cattle manure increased yield, exceeding the average of 50 t ha-1 year-1 determined for ‘Paluma’ guava. In contrast, boron did not increased the yield.","PeriodicalId":51288,"journal":{"name":"Revista Brasileira de Engenharia Agricola e Ambiental","volume":"1 1","pages":"228-234"},"PeriodicalIF":1.2,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89294942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-01DOI: 10.1590/1807-1929/AGRIAMBI.V25N4P264-269
Thales M. de A. Silva, D. Valente, F. Pinto, D. M. Queiroz, N. T. Santos
ABSTRACT Vegetation indexes are important indicators of the health and yield of agricultural crops. Among the sensors used to evaluate vegetation indexes, proximal sensors can be used for real-time decision-making. Thus, the objective of this study was to develop a proximal sensor system based on phototransistors to acquire and store the following vegetation indexes: normalized difference vegetation index, simple ratio, wide dynamic range vegetation index, soil-adjusted vegetation index, and optimized soil-adjusted vegetation index. The sensor system was developed using an analog circuit to acquire reflectance data from red and near-infrared bands. The sensor system was calibrated according to the results of a spectroradiometer, using Zoysia japonica grass as the target. An algorithm that calculates and stores vegetation indexes in a file was developed. The Pearson correlation between the vegetation indexes obtained with the sensor system and the spectroradiometer was evaluated. The vegetation indexes presented a Pearson correlation higher than 0.92 to the estimated values by the spectroradiometer. Under the evaluation conditions, the proposed sensor system could be used to determine all vegetation indexes evaluated.
{"title":"Sensor system for acquisition of vegetation indexes","authors":"Thales M. de A. Silva, D. Valente, F. Pinto, D. M. Queiroz, N. T. Santos","doi":"10.1590/1807-1929/AGRIAMBI.V25N4P264-269","DOIUrl":"https://doi.org/10.1590/1807-1929/AGRIAMBI.V25N4P264-269","url":null,"abstract":"ABSTRACT Vegetation indexes are important indicators of the health and yield of agricultural crops. Among the sensors used to evaluate vegetation indexes, proximal sensors can be used for real-time decision-making. Thus, the objective of this study was to develop a proximal sensor system based on phototransistors to acquire and store the following vegetation indexes: normalized difference vegetation index, simple ratio, wide dynamic range vegetation index, soil-adjusted vegetation index, and optimized soil-adjusted vegetation index. The sensor system was developed using an analog circuit to acquire reflectance data from red and near-infrared bands. The sensor system was calibrated according to the results of a spectroradiometer, using Zoysia japonica grass as the target. An algorithm that calculates and stores vegetation indexes in a file was developed. The Pearson correlation between the vegetation indexes obtained with the sensor system and the spectroradiometer was evaluated. The vegetation indexes presented a Pearson correlation higher than 0.92 to the estimated values by the spectroradiometer. Under the evaluation conditions, the proposed sensor system could be used to determine all vegetation indexes evaluated.","PeriodicalId":51288,"journal":{"name":"Revista Brasileira de Engenharia Agricola e Ambiental","volume":"64 1","pages":"264-269"},"PeriodicalIF":1.2,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80590656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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