Research on control system of variable rate fertilizer applicator in precision agriculture based on NDVI
Xiaoying Niu, Dongping Qian, Wang Xiu, Yang Shi-feng, Limin Shao · Hebei Nongye Daxue xuebao · 2005
The normalized difference vegetative index can be availably used in predicting potential yield, judging crop absorption of N fertilizer of the time and finally determining the most effective quantity of N fertilizer. This system is a fertilizer application system with automatic vaiables which integrated optical sensing with application, which adjusts applying quantity of N fertilizer by real-time measuring spectrum data of crop and the speed of the tractor. The system employs a kind of measuring technology without damaging effect and adopts fuzzy control algorithm. It acquires the real-time value of Normalized Difference Vegetative Index by optical sensors, and accordingly calculates potential yield and applying quantity of N fertilizer using Nitrogen Fertilizer Optimization Algorithm, and simultaneously considers the speed of the tractor of the time to determine open or close of electromagnetic valves to variably apply fertilizer in real-time.