重庆冬水田地区单季籼稻磷钾高效配施方案研究

为了提高以重庆为代表的冬水田地区稻田磷钾养分利用率和单季籼稻的单产水平,以重庆水稻生产主导品种‘渝香203’为材料,通过田间试验研究冬水田地区单季籼稻的磷钾利用特点和磷钾高效配施方案。结果表明,水稻植株组织总的含磷率随施磷量增加而增加,磷收获指数呈先增加后降低的趋势;植株总的含钾率及钾收获指数变化具有类似特点。磷、钾表观利用率随磷、钾用量相应增加而先上升后下降。N150P75K90处理的磷、钾农学利用效率较高,分别为13.07kg/kg、7.80kg/kg。高效的氮磷钾处理为N150P75K90,实际产量为8194.50kg/hm2,其配施方案为氮:磷:钾=2:1:1.2。

Study on the Efficient Combind Application Scheme of P, K with Single Cropping Indica Rice

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 N 150 P 75 K 90,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/hm 2 by the treat of N 150 P 75 K 90,which was the efficient combind application scheme of P and K,and the rate of N:P:K= 2:1:1.2.