Development of a variable rate applicator for uniform fertilizer spreading

Han, Cheol-woo; Lee, Sang Yoon; Hong, Yeh-Sun; Kweon, Giyoung

doi:10.25165/j.ijabe.20191202.3242

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…However, there was systematic bias when the cylinder of the device was in the response state, and it was necessary to further improve the application accuracy. Han et al [30] developed a variable-rate applicator with a uniform spreading pattern to retrofit a commercial spreader. However, it did not have automatic variable speed spreading due to the lack of geographic information system (GIS).…”

Section: Introductionmentioning

confidence: 99%

Single-Neuron PID UAV Variable Fertilizer Application Control System Based on a Weighted Coefficient Learning Correction

Yao

et al. 2022

Agriculture

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Agricultural unmanned aerial vehicles (UAVs), which are a new type of fertilizer application technology, have been rapidly developed internationally. This study combines the agronomic characteristics of rice fertilization with weighted coefficient learning-modified single-neuron adaptive proportional–integral–differential (PID) control technology to study and design an aerial real-time variable fertilizer application control system that is suitable for rice field operations in northern China. The nitrogen deficiency at the target plot is obtained from a map based on a fertilizer prescription map, and the amount of fertilizer is calculated by a variable fertilizer application algorithm. The advantages and disadvantages of the two control algorithms are analyzed by a MATLAB simulation in an indoor test, which is integrated into the spreading system to test the effect of actual spreading. A three-factor, three-level orthogonal test of fertilizer-spreading performance is designed for an outdoor test, and the coefficient of variation of particle distribution Cv (a) as well as the relative error of fertilizer application λ (b) are the evaluation indices. The spreading performance of the spreading system is the best and can effectively achieve accurate variable fertilizer application when the baffle opening is 4%, spreading disc speed is 600 r/min, and flight height is 2 m, with a and b of evaluation indexes of 11.98% and 7.02%, respectively. The control error of the spreading volume is 7.30%, and the monitoring error of the speed measurement module is less than 30 r/min. The results show that the centrifugal variable fertilizer spreader improves the uniformity of fertilizer spreading and the accuracy of fertilizer application, which enhances the spreading performance of the centrifugal variable fertilizer spreader.

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Section: Introductionmentioning

confidence: 99%

Single-Neuron PID UAV Variable Fertilizer Application Control System Based on a Weighted Coefficient Learning Correction

Yao

et al. 2022

Agriculture

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“…This experiment followed a previously described method for remnant fertilizer monitoring [4,5] . The test setup is shown in Figure 10.…”

Section: Field Testmentioning

confidence: 99%

“…Variable-rate Fertilization (VRF) is a precision agriculture method that reduces fertilizer impact on the environment [1][2][3] . A remnant fertilizer monitoring system provides crucial feedback to avoid insufficient discharge of fertilizer due to a lack of fertilizer in the storage tank and ensures the accuracy of variable-rate fertilizer applications [4][5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

“…The total mass M of the fertilizer added to the fertilizer tank in each experiment was 27.6 kg. The remnant fertilizer monitoring system's response time was the time difference between the output of two adjacent detection results.2.4.2 Field testThis experiment followed a previously described method for remnant fertilizer monitoring[4,5] . The test setup is shown in Figure10.…”

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Remnant fertilizer monitoring system for maize fertilizer applicators

Yaohui,

Kailiang,

Yang

et al. 2023

International Journal of Agricultural and Biological Engineering

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A remnant fertilizer monitoring system utilizing three-dimensional (3D) reconstruction was proposed to detect the amount of remaining fertilizer in the applicator's tank. Bench tests were carried out to compare the performance of four algorithms to estimate the remnant fertilizer amount: fertilizer remnant monitoring biharmonic spline algorithm (V4), natural nearest-neighbor algorithm (Natural), linear algorithm (Linear), cubic algorithm (Cubic). The average relative error for remnant fertilizer monitoring is 7.33% for the Linear algorithm, 7.30% for the Natural algorithm, 5.18% for the Cubic algorithm, and 4.30% for the V4 algorithm. Field tests are conducted at three fertilization rates to compare the performances of the V4 and Cubic algorithms. The average relative error for discharged fertilizer monitoring is 8.64% for the Cubic algorithm, which is 1.91% lower than that of the V4 algorithm. The results show that the Cubic algorithm has the best performance for remnant fertilizer monitoring. The average relative error of remnant fertilizer monitoring is 2.42% for the Cubic algorithm, which is 0.43% lower than that of the V4 algorithm. The response time of the remnant fertilizer monitoring system is 0.26 s. The results demonstrate that the proposed remnant fertilizer monitoring system is highly accurate and suitable for real-time applications.

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Development of Centrifugal Disc Spreader on Tracked Combine Harvester for Rape Undersowing Rice Based on DEM

Guan

Jiang

et al. 2022

Agriculture

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Rape undersowing rice is an effective method to solve the problem of short crop rotation in rice-rape rotation. Applying of ground fertilizer to rape is one of the most critical aspects in this planting pattern. However, a special fertilizer spreading is required after the rice is harvested, which increases the labor intensity and the compaction of rape and soil and is also hindered by a lack of equipment to complete the harvesting and fertilizer spreading simultaneously. In response to the above issues, a centrifugal disc spreader on a tracked combine harvester for rape undersowing rice was developed. The basic parameters of the spreader were designed based on the agronomic requirements for fertilization and tracked combine harvester. Kinematic and kinetic models of fertilizer particles were developed to determine the key parameters that affect fertilizer spreading. Based on discrete element simulations, the effects of single structure and interaction of centrifugal disc spreader on fertilizer distribution pattern were investigated. The spreading range and coefficient of variation of fertilizer lateral distribution regression models were constructed, and the spreader parameters were optimized based on the regression models. The simulation results and fertilizer spreading performance were verified by bench tests. The results show that the distribution of fertilizer from simulation tests and bench tests was consistent. The coefficient of variation of fertilizer lateral distribution was 13.1% for the simulation test and 14.6% for the bench test. The error of simulation test was 10.3%, which indicates that the simulation result was reliable. The developed centrifugal disc spreader can meet the needs of fertilizer spreading for rape undersowing rice. The results serve as a theoretical basis for the design of a fertilizer spreader and provide new ways to promote accurate and efficient spreading of fertilizer.

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Development of a variable rate applicator for uniform fertilizer spreading

Cited by 3 publications

References 8 publications

Single-Neuron PID UAV Variable Fertilizer Application Control System Based on a Weighted Coefficient Learning Correction

Single-Neuron PID UAV Variable Fertilizer Application Control System Based on a Weighted Coefficient Learning Correction

Remnant fertilizer monitoring system for maize fertilizer applicators

Development of Centrifugal Disc Spreader on Tracked Combine Harvester for Rape Undersowing Rice Based on DEM

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