论文部分内容阅读
本文根据１９９０—１９９２年的有关试验结果和吨粮田定位四块资料，在系统研究高产小麦—夏玉米吸肥特点的基础上，总结了肥料的经济用量和合理运筹方式。结果表明，吨粮田小麦的吸氮高峰在分蘖一越冬和拔节一孕穗期，夏玉米开花期吸氮量达总吸氮量的６０％、整个系统吸收氮磷钾总量分别为３０．７９、１１．１１和１４．８２ｋｇ／亩，三者产投比分别为０．９９、０．９９和１．２８。该系统适宜的氮磷钾素亩用量分别为３７．５、１５和１８ｋｇ。氮素分配，小麦占４０％，夏玉米占６０％。小麦上的氮７０％基施，３０％拔节期追施；夏玉米４０％苗肥，４０％穗肥，２０％粒肥。
Based on the four experimental data of 1990-1992 and the location of ton grain field, this paper summarizes the economic usage of fertilizer and the rational operation mode on the basis of systematically studying the characteristics of high yield wheat - summer maize. The results showed that the peak of nitrogen uptake in ton grain wheat was overwintering at tillering stage and one booting stage at jointing stage. The nitrogen uptake of summer maize reached 60% of the total nitrogen uptake at flowering stage, and the total amount of NPK absorbed by the whole system was 30.79 , 11.11 and 14.82kg / mu respectively, the production ratio of the three was 0.99, 0.99 and 1.28 respectively. The system suitable amount of nitrogen, phosphorus and potassium acres were 37.5,15 and 18kg. Nitrogen distribution, wheat 40%, summer corn 60%. Nitrogen 70% on wheat base facilities, topdressing 30% jointing; summer maize 40% Miao Fei, 40% of the panicle fertilizer, 20% of the grain fertilizer.