Pub Date : 2023-08-21DOI: 10.1590/1809-4430-eng.agric.v43n3e20210168/2023
J. Bruning, A. D. Robaina, M. X. Peiter, Miguel Chaiben Neto, S. A. Rodrigues
In rural areas, the electricity supply is affected by problems such as low quality and limited access in some regions. The use of renewable sources, with decentralized generation, can offer an alternative to the existing scenario. The objective of this work is to perform a technical and economic analysis of off-grid photovoltaic systems, without energy storage, intended for irrigation. Photovoltaic systems from different irrigation systems were sized, with power ratings from 0.736 to 29.44 kW. Their technical feasibility was determined based on the energy supply period and the availability of solar radiation as restriction variables. Economic feasibility was determined by the indicators of net present value (NPV), internal rate of return (IRR), benefit/cost ratio (B/C) and profitability index (PI). Feasible operation was found for irrigation systems with motors up to 11.04 kW; however, for systems that required higher powers, the number of operating hours available was less than
{"title":"TECHNICAL AND ECONOMIC FEASIBILITY OF OFF-GRID PHOTOVOLTAIC SYSTEMS FOR IRRIGATION","authors":"J. Bruning, A. D. Robaina, M. X. Peiter, Miguel Chaiben Neto, S. A. Rodrigues","doi":"10.1590/1809-4430-eng.agric.v43n3e20210168/2023","DOIUrl":"https://doi.org/10.1590/1809-4430-eng.agric.v43n3e20210168/2023","url":null,"abstract":"In rural areas, the electricity supply is affected by problems such as low quality and limited access in some regions. The use of renewable sources, with decentralized generation, can offer an alternative to the existing scenario. The objective of this work is to perform a technical and economic analysis of off-grid photovoltaic systems, without energy storage, intended for irrigation. Photovoltaic systems from different irrigation systems were sized, with power ratings from 0.736 to 29.44 kW. Their technical feasibility was determined based on the energy supply period and the availability of solar radiation as restriction variables. Economic feasibility was determined by the indicators of net present value (NPV), internal rate of return (IRR), benefit/cost ratio (B/C) and profitability index (PI). Feasible operation was found for irrigation systems with motors up to 11.04 kW; however, for systems that required higher powers, the number of operating hours available was less than","PeriodicalId":49078,"journal":{"name":"Engenharia Agricola","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67257883","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}
In the process of rice harvesting, the passability of the track combine harvester is often limited by the state of the soil. Meanwhile, wet and soft paddy soil is compacted under the rolling of harvesting machinery, which also affects the soil function and the ecological environment. Therefore, the relationship between the physical and mechanical properties of wet and soft paddy soil was studied in this paper. In addition, compaction from a track combine harvester on field soil with and without rice stubble was studied. The density and gradation of wet and soft paddy soil were positively correlated with cohesion and negatively correlated with the internal friction angle. In paddy soil with a moisture content of 16–36%, the soil moisture content was negatively correlated with cohesion and internal
{"title":"EFFECT OF RICE STUBBLE ON SOIL COMPACTION PROPERTIES OF A CRAWLER UNDERGOING COMBINE HARVESTER HARVESTING","authors":"Sifan Liu, Zhongru Tang, Cheng Shen, Ting Wang, Yaquan Liang","doi":"10.1590/1809-4430-eng.agric.v43n3e20230057/2023","DOIUrl":"https://doi.org/10.1590/1809-4430-eng.agric.v43n3e20230057/2023","url":null,"abstract":"In the process of rice harvesting, the passability of the track combine harvester is often limited by the state of the soil. Meanwhile, wet and soft paddy soil is compacted under the rolling of harvesting machinery, which also affects the soil function and the ecological environment. Therefore, the relationship between the physical and mechanical properties of wet and soft paddy soil was studied in this paper. In addition, compaction from a track combine harvester on field soil with and without rice stubble was studied. The density and gradation of wet and soft paddy soil were positively correlated with cohesion and negatively correlated with the internal friction angle. In paddy soil with a moisture content of 16–36%, the soil moisture content was negatively correlated with cohesion and internal","PeriodicalId":49078,"journal":{"name":"Engenharia Agricola","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67257659","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 : 2023-08-01DOI: 10.1590/1809-4430-eng.agric.v43n3e20200037/2023
Xingzao Ma, Danna Zheng, Zhuangdong Fang
The structural parameters of a grain dryer are directly related to the its energy consumption and quality formation. Therefore, based on the Ergun model, air state parameters and uniformity evaluation method, the effect of changes in the ventilation area on grain airflow resistance, drying energy consumption, drying efficiency and uniformity are theoretically and experimentally studied in this work under the same initial grain weight and air flux. The results show that under the conditions of air temperatures 35 ℃ and 70 ℃ , the weight of paddy 8.547 kg and the air flux 12.3 m 3 ·h -1 , hot air introduced into the drying chamber with cross-sectional areas of S1 and S2 respectively, the ventilation area enlarged by 2.328 times, the grain airflow resistance decreased by 7.17 and 6.99 times. Enlarging the ventilation area effectively improved the drying rate of paddy, especially at 70 ℃ , while the unit energy consumption was the opposite. It also accelerated the moving speed of the saturated humidity line in the drying layer and improved the drying uniformity of the paddy. These experimental results
谷物干燥机的结构参数直接关系到其能耗和品质的形成。因此，本工作基于二衮模型、空气状态参数和均匀性评价方法，在相同初始粒重和空气通量的条件下，从理论上和实验上研究了通风面积变化对颗粒气流阻力、干燥能耗、干燥效率和均匀性的影响。结果表明:在空气温度为35℃和70℃、稻谷质量为8.547 kg、风通量为12.3 m 3·h -1的条件下，分别将热风引入截面积为S1和S2的干燥室，通风面积增大了2.328倍，稻谷气流阻力减小了7.17倍和6.99倍。扩大通风面积能有效提高水稻的干燥速度，特别是在70℃时，但单位能耗与之相反。它还加快了干燥层饱和湿度线的移动速度，提高了水稻的干燥均匀性。这些实验结果
{"title":"EFFECT OF CONSTANT VOLUME STRUCTURE PARAMETERS ON GRAIN VENTILATION DRYING","authors":"Xingzao Ma, Danna Zheng, Zhuangdong Fang","doi":"10.1590/1809-4430-eng.agric.v43n3e20200037/2023","DOIUrl":"https://doi.org/10.1590/1809-4430-eng.agric.v43n3e20200037/2023","url":null,"abstract":"The structural parameters of a grain dryer are directly related to the its energy consumption and quality formation. Therefore, based on the Ergun model, air state parameters and uniformity evaluation method, the effect of changes in the ventilation area on grain airflow resistance, drying energy consumption, drying efficiency and uniformity are theoretically and experimentally studied in this work under the same initial grain weight and air flux. The results show that under the conditions of air temperatures 35 ℃ and 70 ℃ , the weight of paddy 8.547 kg and the air flux 12.3 m 3 ·h -1 , hot air introduced into the drying chamber with cross-sectional areas of S1 and S2 respectively, the ventilation area enlarged by 2.328 times, the grain airflow resistance decreased by 7.17 and 6.99 times. Enlarging the ventilation area effectively improved the drying rate of paddy, especially at 70 ℃ , while the unit energy consumption was the opposite. It also accelerated the moving speed of the saturated humidity line in the drying layer and improved the drying uniformity of the paddy. These experimental results","PeriodicalId":49078,"journal":{"name":"Engenharia Agricola","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67257841","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 : 2023-07-10DOI: 10.1590/1809-4430-eng.agric.v43n3e20220183/2023
Chao Wang, Hanyu Yang, Jin He, Kexin Kang, Hongwen Li
Pneumatic seed metering devices are widely used in high-speed and precise corn seeding operations. The objective of this study was to analysis the high-speed seeding performance of a pneumatic precision seed metering device at seeding speed ≥12 km/h. In this study, full-factor experiments were conducted of an air-suction rotary-hub corn precision seed metering device at the early stage of development. Seed leaking was the primary failure mode, and the experimental factors had no evident regular influence on the repeat index. The negative pressure of 3-7 kPa had significantly positive and negative correlations with the qualified index and the leak index, whereas the seeding speed of 12-20 km/h was significantly negatively and positively correlated with the qualified index and the leak index, respectively. The leak index reached its greatest value of 32.48%, 15.61% and 66.77% when the negative pressure was 3 kPa
{"title":"THE INFLUENCE OF SEED VARIETY AND HIGH SEEDING SPEED ON PNEUMATIC PRECISION SEED METERING","authors":"Chao Wang, Hanyu Yang, Jin He, Kexin Kang, Hongwen Li","doi":"10.1590/1809-4430-eng.agric.v43n3e20220183/2023","DOIUrl":"https://doi.org/10.1590/1809-4430-eng.agric.v43n3e20220183/2023","url":null,"abstract":"Pneumatic seed metering devices are widely used in high-speed and precise corn seeding operations. The objective of this study was to analysis the high-speed seeding performance of a pneumatic precision seed metering device at seeding speed ≥12 km/h. In this study, full-factor experiments were conducted of an air-suction rotary-hub corn precision seed metering device at the early stage of development. Seed leaking was the primary failure mode, and the experimental factors had no evident regular influence on the repeat index. The negative pressure of 3-7 kPa had significantly positive and negative correlations with the qualified index and the leak index, whereas the seeding speed of 12-20 km/h was significantly negatively and positively correlated with the qualified index and the leak index, respectively. The leak index reached its greatest value of 32.48%, 15.61% and 66.77% when the negative pressure was 3 kPa","PeriodicalId":49078,"journal":{"name":"Engenharia Agricola","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67257590","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 : 2023-07-10DOI: 10.1590/1809-4430-eng.agric.v43n2e20220225/2023
R. C. Santos, André L. N. Lopes, A. C. Sanches, E. P. Gomes, Edlaine A. S. da Silva, Jhon L. B. da Silva
Increasing population and demand for animal-derived products has raised the need for improved efficiency in managing and controlling animal production. Given this context, the project aimed to develop a device that aids decision-making in animal production. A hardware system was designed for instant measurement of thermal well-being levels, light intensity, and air gas concentration. This hardware integrated DHT11 sensors, an LDR photoresistor, and an MQ-135 sensor. To validate the system, a 30-day experimental study was conducted in an industrial pig farming setting. The collected data was sent to the Thingspeak server using the HTTP protocol. Data management, filtering, and organization were optimized using developed treatment algorithms. The system presented information on air humidity, temperature, ammonia concentration, CO 2 levels, luminosity, and enthalpy through interactive images on a dashboard. In the case of a risk situation, the system automatically notified users with an "ALERT" message, facilitating prompt and efficient management response, and minimizing losses. The sensor calibration process yielded a high coefficient of determination (r² = 0.98). Thus, the developed IoT device represents a viable solution, providing precise environmental conditions to support producers and enhance their efficiency and sustainability.
{"title":"INTELLIGENT AUTOMATED MONITORING INTEGRATED WITH ANIMAL PRODUCTION FACILITIES","authors":"R. C. Santos, André L. N. Lopes, A. C. Sanches, E. P. Gomes, Edlaine A. S. da Silva, Jhon L. B. da Silva","doi":"10.1590/1809-4430-eng.agric.v43n2e20220225/2023","DOIUrl":"https://doi.org/10.1590/1809-4430-eng.agric.v43n2e20220225/2023","url":null,"abstract":"Increasing population and demand for animal-derived products has raised the need for improved efficiency in managing and controlling animal production. Given this context, the project aimed to develop a device that aids decision-making in animal production. A hardware system was designed for instant measurement of thermal well-being levels, light intensity, and air gas concentration. This hardware integrated DHT11 sensors, an LDR photoresistor, and an MQ-135 sensor. To validate the system, a 30-day experimental study was conducted in an industrial pig farming setting. The collected data was sent to the Thingspeak server using the HTTP protocol. Data management, filtering, and organization were optimized using developed treatment algorithms. The system presented information on air humidity, temperature, ammonia concentration, CO 2 levels, luminosity, and enthalpy through interactive images on a dashboard. In the case of a risk situation, the system automatically notified users with an \"ALERT\" message, facilitating prompt and efficient management response, and minimizing losses. The sensor calibration process yielded a high coefficient of determination (r² = 0.98). Thus, the developed IoT device represents a viable solution, providing precise environmental conditions to support producers and enhance their efficiency and sustainability.","PeriodicalId":49078,"journal":{"name":"Engenharia Agricola","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67257776","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 : 2023-07-03DOI: 10.1590/1809-4430-eng.agric.v43n2e20220129/2023
Qin Zhou, Yu Bai, Zhongping Chai, Jianghui Zhang, Ming Zheng
Clay soil results in higher crop yield and quality than sandy soil. However, irrigation causes clay soil to slump easily, increasing compactness and decreasing soil oxygen content. This study investigated the effects of dry seeding and wet emergence on the soil microenvironment and cotton growth promotion in Xinjiang silt loam fields. The experimental design included three aerated and three non-aerated treatments. The results showed that aerated irrigation decreased dry density of the 0–20 cm soil layer to different degrees, the field capacity increased
{"title":"EFFECT OF AERATED IRRIGATION ON SOIL MICROENVIRONMENT AND COTTON GROWTH PROMOTION","authors":"Qin Zhou, Yu Bai, Zhongping Chai, Jianghui Zhang, Ming Zheng","doi":"10.1590/1809-4430-eng.agric.v43n2e20220129/2023","DOIUrl":"https://doi.org/10.1590/1809-4430-eng.agric.v43n2e20220129/2023","url":null,"abstract":"Clay soil results in higher crop yield and quality than sandy soil. However, irrigation causes clay soil to slump easily, increasing compactness and decreasing soil oxygen content. This study investigated the effects of dry seeding and wet emergence on the soil microenvironment and cotton growth promotion in Xinjiang silt loam fields. The experimental design included three aerated and three non-aerated treatments. The results showed that aerated irrigation decreased dry density of the 0–20 cm soil layer to different degrees, the field capacity increased","PeriodicalId":49078,"journal":{"name":"Engenharia Agricola","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67257302","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 : 2023-07-01DOI: 10.1590/1809-4430-eng.agric.v43n3e20220062/2023
Chengcheng Ma, Shujuan Yi, Guixiang Tao
The paddy field machine uses excessive power during paddy field preparation because of the high distribution density of rice straw. In this study, a rotary blade is created to address this problem. The structural parameters of the rotary blade were designed and the dynamic analysis of the rotary blade's soil-cutting process was completed to establish a model of the rotary blade's power consumption. Through the model, the primary factors influencing the rotary blade's power consumption were identified. A composite soil bin model of rice straw‒muddy layer‒bottom soil was established in EDEM software, with the bending angle of the front blade, the working width of a single blade, and the thickness of the blade as the test factors. The straw burying rate, power consumption, and surface flatness after rotary tillage were used as evaluation indicators to conduct multi-factor simulation tests on the composite soil bin model. The optimized analysis of the test data showed that the optimal geometric parameters for the rotary blade were 49 mm working width, 108° front blade bending angle, and 4 mm blade thickness. A field verification test was carried out on the optimized rotary blade, and the test results showed that the surface flatness after rotary tillage was 3.25 cm, the qualified rate of rotary tillage depth was 93.3%, and the degree of mud mixing was 3.41 kg/dm 3 , which was suitable for the land preparation requirements of paddy fields.
{"title":"A ROTARY BLADE DESIGN FOR PADDY FIELDS WITH LONG RICE STRAW BASED ON EDEM","authors":"Chengcheng Ma, Shujuan Yi, Guixiang Tao","doi":"10.1590/1809-4430-eng.agric.v43n3e20220062/2023","DOIUrl":"https://doi.org/10.1590/1809-4430-eng.agric.v43n3e20220062/2023","url":null,"abstract":"The paddy field machine uses excessive power during paddy field preparation because of the high distribution density of rice straw. In this study, a rotary blade is created to address this problem. The structural parameters of the rotary blade were designed and the dynamic analysis of the rotary blade's soil-cutting process was completed to establish a model of the rotary blade's power consumption. Through the model, the primary factors influencing the rotary blade's power consumption were identified. A composite soil bin model of rice straw‒muddy layer‒bottom soil was established in EDEM software, with the bending angle of the front blade, the working width of a single blade, and the thickness of the blade as the test factors. The straw burying rate, power consumption, and surface flatness after rotary tillage were used as evaluation indicators to conduct multi-factor simulation tests on the composite soil bin model. The optimized analysis of the test data showed that the optimal geometric parameters for the rotary blade were 49 mm working width, 108° front blade bending angle, and 4 mm blade thickness. A field verification test was carried out on the optimized rotary blade, and the test results showed that the surface flatness after rotary tillage was 3.25 cm, the qualified rate of rotary tillage depth was 93.3%, and the degree of mud mixing was 3.41 kg/dm 3 , which was suitable for the land preparation requirements of paddy fields.","PeriodicalId":49078,"journal":{"name":"Engenharia Agricola","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67257497","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}
Various problems are encountered during the screw feeding process of chopped cornstalk. Therefore, it is important to deeply analyze and understand the relationship between conditions and productivity of screw conveyors. This study reveals the influence of air velocity, pitch, rotational speed, and feeding rate on productivity, power consumption, specific power consumption and pressure of material for a coupled screw-pneumatic conveyor. Through a theoretical analysis, a mathematical model is established that simultaneously considers the compression characteristics of the material, material pressure from the change in pitch and centrifugal force of the screw axis, productivity of the coupled screw-pneumatic conveyor, power consumption and specific power consumption. Then, experiments are conducted to investigate the influence of the structural and working parameters of the conveyor on its performance. Finally, the correctness of the theoretical calculation is verified through a comparison with experimental results. The results of the theoretical
{"title":"A THEORETICAL ANALYSIS AND EXPERIMENTAL STUDY OF A COUPLED SCREW-PNEUMATIC CONVEYOR FOR CHOPPED CORNSTALKS","authors":"Wulantuya, Nanding Li, Hongbo Wang, Zhipeng Fan, Chunguang Wang, Lin Qing","doi":"10.1590/1809-4430-eng.agric.v43n3e20220068/2023","DOIUrl":"https://doi.org/10.1590/1809-4430-eng.agric.v43n3e20220068/2023","url":null,"abstract":"Various problems are encountered during the screw feeding process of chopped cornstalk. Therefore, it is important to deeply analyze and understand the relationship between conditions and productivity of screw conveyors. This study reveals the influence of air velocity, pitch, rotational speed, and feeding rate on productivity, power consumption, specific power consumption and pressure of material for a coupled screw-pneumatic conveyor. Through a theoretical analysis, a mathematical model is established that simultaneously considers the compression characteristics of the material, material pressure from the change in pitch and centrifugal force of the screw axis, productivity of the coupled screw-pneumatic conveyor, power consumption and specific power consumption. Then, experiments are conducted to investigate the influence of the structural and working parameters of the conveyor on its performance. Finally, the correctness of the theoretical calculation is verified through a comparison with experimental results. The results of the theoretical","PeriodicalId":49078,"journal":{"name":"Engenharia Agricola","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67257536","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 : 2023-07-01DOI: 10.1590/1809-4430-eng.agric.v43n3e20220008/2023
Matheus S. Nilsson, P. Fiorio, Mitsuhiko R. H. Takushi, Ana K. da S. Oliveira, Amparo C. Garcia
Hyperspectral sensors and regression analysis have been used to analyze the most important spectral ranges for biophysical parameters of target crops, aiding in management decision-making. This study aimed to analyze the spectral response of Brachiaria brizantha cv. Marandú leaves to increasing rates of urea fertilization and predict leaf nitrogen content (LNC). Four rates of urea fertilization (0, 25, 50, and 75 kg of N ha -1 ) were applied. Eight leaves were collected per plot seven times at monthly intervals and subjected to hyperspectral analysis. Leaf spectral responses differed statistically within the visible region, particularly at 550 nm (green). The regression models achieved moderate to good R² values (0.53 to 0.83) for predicting LNC and identified important wavelengths in the red edge region (715 to 720 nm). These findings demonstrate the potential of spectral analysis to detect changes and forecast leaf nitrogen content in B. brizantha cv. Marandú crops at different fertilization levels.
{"title":"EFFECT OF DIFFERENT NITROGEN FERTILIZATION RATES ON THE SPECTRAL RESPONSE OF Brachiaria brizantha cv. MARANDÚ LEAVES","authors":"Matheus S. Nilsson, P. Fiorio, Mitsuhiko R. H. Takushi, Ana K. da S. Oliveira, Amparo C. Garcia","doi":"10.1590/1809-4430-eng.agric.v43n3e20220008/2023","DOIUrl":"https://doi.org/10.1590/1809-4430-eng.agric.v43n3e20220008/2023","url":null,"abstract":"Hyperspectral sensors and regression analysis have been used to analyze the most important spectral ranges for biophysical parameters of target crops, aiding in management decision-making. This study aimed to analyze the spectral response of Brachiaria brizantha cv. Marandú leaves to increasing rates of urea fertilization and predict leaf nitrogen content (LNC). Four rates of urea fertilization (0, 25, 50, and 75 kg of N ha -1 ) were applied. Eight leaves were collected per plot seven times at monthly intervals and subjected to hyperspectral analysis. Leaf spectral responses differed statistically within the visible region, particularly at 550 nm (green). The regression models achieved moderate to good R² values (0.53 to 0.83) for predicting LNC and identified important wavelengths in the red edge region (715 to 720 nm). These findings demonstrate the potential of spectral analysis to detect changes and forecast leaf nitrogen content in B. brizantha cv. Marandú crops at different fertilization levels.","PeriodicalId":49078,"journal":{"name":"Engenharia Agricola","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67257936","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 : 2023-07-01DOI: 10.1590/1809-4430-eng.agric.v43n3e20220121/2023
Minghao Pei, Shiguan An, Shen Chen, Jiangtao Qi, Yaping Li
The aim of this study is to simplify the difficult excavation that is caused by the root-sand complex in the process of harvesting Cyperus esculentus in the desert of Xinjiang by performing mechanical tests and analysis of the interaction between the vibrating excavation shovel and the rotary blade on the root-sand complex. The rotary blade number, rotary blade speed and digging depth were used as the test parameters, and the Cyperus esculentus breakage rate, root-grass crushing rate, and soil carrying rate were used as the test indicators. The characteristics of the influence of various factors and their interaction on the crushing and separation of the root-sand complex were explored. A parameter combination optimization model is verified by experimental data. The test results showed that the optimal combination was as follows: the number of rotary blades was 20, the rotational speed of the rotary blade was 373 r/min, and the digging depth was 12 cm. At this time, the Cyperus esculentus breakage rate, root-grass crushing rate, and soil carrying rate were 2.62%, 63.68% and 55.40%, respectively. This study can support the development of a Cyperus esculentus harvester suitable for deserts in Xinjiang.
{"title":"ANALYSIS AND EXPERIMENTATION OF THE CRUSHING AND SEPARATION PROCESS OF THE ROOT-SAND COMPLEX OF HARVESTED AND EXCAVATED Cyperus esculentus L. IN DESERTS","authors":"Minghao Pei, Shiguan An, Shen Chen, Jiangtao Qi, Yaping Li","doi":"10.1590/1809-4430-eng.agric.v43n3e20220121/2023","DOIUrl":"https://doi.org/10.1590/1809-4430-eng.agric.v43n3e20220121/2023","url":null,"abstract":"The aim of this study is to simplify the difficult excavation that is caused by the root-sand complex in the process of harvesting Cyperus esculentus in the desert of Xinjiang by performing mechanical tests and analysis of the interaction between the vibrating excavation shovel and the rotary blade on the root-sand complex. The rotary blade number, rotary blade speed and digging depth were used as the test parameters, and the Cyperus esculentus breakage rate, root-grass crushing rate, and soil carrying rate were used as the test indicators. The characteristics of the influence of various factors and their interaction on the crushing and separation of the root-sand complex were explored. A parameter combination optimization model is verified by experimental data. The test results showed that the optimal combination was as follows: the number of rotary blades was 20, the rotational speed of the rotary blade was 373 r/min, and the digging depth was 12 cm. At this time, the Cyperus esculentus breakage rate, root-grass crushing rate, and soil carrying rate were 2.62%, 63.68% and 55.40%, respectively. This study can support the development of a Cyperus esculentus harvester suitable for deserts in Xinjiang.","PeriodicalId":49078,"journal":{"name":"Engenharia Agricola","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67257569","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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