冬小麦高产稳产的适宜氮磷营养基础及合理施肥技术

对两个冬小麦品种主要生育期N、P_2O_5吸收积累与小麦不同生育阶段光合产物积累及产量关系进行了系统研究,结果表明,小麦生育中前期光合产物积累随N、P_2O_5吸收积累的增加而呈直线或曲线增加,但过多的N积累对开花后光合产物积累及籽粒产技的提高均产生不利影响;确定了小麦不同生育阶段N、P_2O_5吸收积累的适宜指标和范围,并根据N、P施肥与小麦N、P_2O_5吸收积累的关系明确了小麦N、P_2O_5吸收积累主要与氮磷施肥有关,据此提出了保持小麦生育过程中适宜氮磷营养的施肥调控技术措施.

Suitable Nutrition Basis of Nitrogen and Phosphorus and Rational Application of Fertilizer for High and Stable Yield in Winter Wheat

Field trials were conducted to study the relationship between absorption oi N, P2O5 and accumulation of photosynthate in the main growing stages and grain yield by using two varieties of winter wheat during 1986-1990. The results showed that the accumule-tion of photosynthatc increased with absorption of N, P2O5 in the early growing siage. The excessive absorption of N would induce unfavourable effect on the post-anthcsis biomass accumulation and final yield. The suitable criteria of N and P2O5 absorption in main growing stages were determined. And also it was revealed that N and P2O5 absorption and accumulation were mainly related to the amount of N and P2O5 applied. Based on the result, monitoring techniques for fertilizer used to maintain suitable N and P2O5 levels in wheat were established.