Effect of the Fertilization Model of N Controlling and P Saving on Nutrient Uptake and Rice Yield

Poyang lake region,a main rice-production area of Jiangxi province,is mainly a double cropping rice region.On the basis of current recommended fertilization in single season which N∶P2O5∶ K2O is 180∶90∶150 kg/ha,an experiment of N-controlling and P-saving fertilization model which was mineral fertilizer combined with pig manure,increasing N and K fertilizer before heading date and applicating fertilizer synergist was carried out.The results showed that in the condition of equal nutrient,compared with 100% F treatment,the total double cropping rice yield of 80% F and pig manure increased 93 kg/ha,increased by 0.74%.In the condition of decreasing 20% fetilizer,increasing N and K fertilizer or adding fertilizer synergist at the heading date,the early rice yield increased to some extent,and the late rice yield decreased to some extent,but the total both early and late rice yield did not change.Then the efficiency of nutrient was significantly increased by controlling N and saving P fertilizer.