Nitrogen fertilizer rate
phosphorus fertilizer rate
reducing nitrogen fertilizer rate
nitrogen phosphorus fertilizer
Design of Variable Rate Fertilizer Applicator
fertilizer rate for maximum profit
fertilizing nitrogen rate
maximum fertilizer rate
nitrogen and phosphorus rate
Nitrogen fertilizer application rate
Nitrogen rate
氮肥用量
氮用量
氮肥水平
氮素形态
氮素水平
施氮量
施用量
施氮水平
氮肥
地力水平
optimized N fertilizer rate
optimum fertilizer rate
Phosphorus rate applied