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Digital Map-Based Site-Specific Granular Fertilizer Application System


Affiliations
1 ICAR-Central Institute of Agricultural Engineering, Bhopal 462 038, India
2 Agricultural and Food Engineering Department, Indian Institute of Technology, Kharagpur 721 302, India
3 ICAR-Central Potato Research Institute, Shimla 171 001, India
 

Variable rate application is the process of applying different rates of crop inputs according to the variability within an agricultural field. Variable rate fertilizer application is a technology that regulates the fertilizer application rate based on site-specific needs within a field. A GPS-based variable rate fertilizer application (VRFA) system was developed, which consisted of a differential global positioning system (DGPS), micro-processor, micro-controller, DC motor actuator, power supply, threaded screw arrangement and fluted roller metering mechanism. The digital soil nutrient availability and application maps for targeted yield were also developed. DGPS was used for real-time identification of grids. Based on the microcontroller algorithm, application rates were varied by changing the feed roller exposure length. The observed fertilizer application rate was 5 and 300 kg/ha for exposure length of 0 and 44 mm respectively. The results indicate that the fertilizer application rate changes according to the prescribed application rate at the identified grid with coefficient of variation (CV) of 11.7-15%. The values of ischolar_main mean square error and relative difference of the system for different levels of application rates were 2.62 and 3.71 respectively. It can be concluded that the developed VRFA system closely meets the target fertilizer application rate at the selected grid point.

Keywords

Differential Global Positioning System, Fertilizer Applicator, Interpolation, Micro-Controller, Soil Nutrient Map.
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  • Digital Map-Based Site-Specific Granular Fertilizer Application System

Abstract Views: 339  |  PDF Views: 92

Authors

N. S. Chandel
ICAR-Central Institute of Agricultural Engineering, Bhopal 462 038, India
C. R. Mehta
ICAR-Central Institute of Agricultural Engineering, Bhopal 462 038, India
V. K. Tewari
Agricultural and Food Engineering Department, Indian Institute of Technology, Kharagpur 721 302, India
B. Nare
ICAR-Central Potato Research Institute, Shimla 171 001, India

Abstract


Variable rate application is the process of applying different rates of crop inputs according to the variability within an agricultural field. Variable rate fertilizer application is a technology that regulates the fertilizer application rate based on site-specific needs within a field. A GPS-based variable rate fertilizer application (VRFA) system was developed, which consisted of a differential global positioning system (DGPS), micro-processor, micro-controller, DC motor actuator, power supply, threaded screw arrangement and fluted roller metering mechanism. The digital soil nutrient availability and application maps for targeted yield were also developed. DGPS was used for real-time identification of grids. Based on the microcontroller algorithm, application rates were varied by changing the feed roller exposure length. The observed fertilizer application rate was 5 and 300 kg/ha for exposure length of 0 and 44 mm respectively. The results indicate that the fertilizer application rate changes according to the prescribed application rate at the identified grid with coefficient of variation (CV) of 11.7-15%. The values of ischolar_main mean square error and relative difference of the system for different levels of application rates were 2.62 and 3.71 respectively. It can be concluded that the developed VRFA system closely meets the target fertilizer application rate at the selected grid point.

Keywords


Differential Global Positioning System, Fertilizer Applicator, Interpolation, Micro-Controller, Soil Nutrient Map.

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DOI: https://doi.org/10.18520/cs%2Fv111%2Fi7%2F1208-1213