Abstract:

In order to improve the utilization rate of the phosphorus, potassium and the grain-yield level in Chongqing winter paddy field, dominant hybrid mid-rice varieties ‘Yuxiang 203’ in Chongqing was used to study the phosphorus and potassium utilization characteristics of single cropping indica rice in the winter paddy field by field experiment. The results showed that, total phosphorus content of the rice plant increased with the increasing of phosphorus application. Phosphorus harvest index appeared to increase first and then declined with the increasing of phosphorus application. The change of total potassium content of the rice plant and potassium harvest index were similar to that of phosphorus. Phosphorus and potassium apparent utilization appeared to increase first and then declined with the increasing of corresponding phosphorus and potassium application. By the treat of N150P75K90, the phosphorus and potassium agronomy utilization efficiency were higher, which were 13.07 kg/kg and 7.80 kg/kg respectively. The actual grain yield reached to 8194.50 kg/hm2 by the treat of N150P75K90, which was the efficient combind application scheme of P and K, and the rate of N:P:K=2:1:1.2.