Abstract:

Taking the spring maize “fertilizer rate” experiments in Jilin Province as an example, the process of establishing fertilization recommendation index was investigated. Soil Olsen-P were classified as low(<75% relative yield), medium(75%-90% relative yield), high(90%-95% relative yield) and very high(>95%relative yield) based on the relative yields. P fertilizer recommended rates were simulated by the models of one-factor for each “fertilizer rate” field experiment. The results indieate that phosphorus fertilizer rates (P2O5) are 83 kg/ha, 60 kg/ha, 45 kg/ha and 0 kg/ha。When soil fertility are classified as low, medium, high and ver high（Olsen-P＜5 mg/kg, 5-21mg/kg, 21-34mg/kg, ＞34mg/kg）, respectively.