Abstract:

Taking the rapeseed “3414” experiments in Wuhu county as an example, the process of establishing fertilization recommendation index was investigated and discussed. Soil Olsen-P and NH4OAc-K were classified as very low (<50% relative yield), low (50%-75% relative yield), medium (75%–90% relative yield), high (90%–95% relative yield) and very high (>95% relative yield) based on the relative yields. Fertilizer recommended rates were simulated by the models of one-factor or Linear-plateau model for each “3414” field experiment. The results indicate that phosphorus fertilizer rates (P2O5) are 65, 55, 45, 30, and 0 kg/ha when soil fertility are classified as very low, medium, high and very high (Olsen-P<10, 10–20, 20–30 30–40 and >40 mg/kg), respectively, while potassium fertilizer rates (K2O) are 75, 60, 45, 30, and 0 kg/ha(NH4OAc-K <20, 20–50, 50–100, 100–125 and >125mg/kg). The method of Regional Mean Optimal Application Rate of Chemical Fertilizer N is used for rapeseed, and the rate is 180±30 kg/ha.