不同包膜控释肥施用对轮作作物养分利用效率的影响

Effects of Application of Different Coating Controlled-Release Fertilizers on N and S Using Efficiency in Corn/Wheat Rotation System

为揭示不同包膜控释肥对轮作作物氮、硫养分利用效率的差异,在池栽条件下,连续2年选用控释掺混肥(SCU+PCU)、硫加树脂包膜控释氮肥(PSCU)和树脂包膜控释氮肥(PCU)在夏玉米-冬小麦体系中,研究不同包膜控释肥对轮作作物籽粒产量的差异及与氮素利用效率和硫素利用效率的关系。结果表明:施用控释掺混肥和PSCU均可明显促进作物生长,增加植株对氮和硫的吸收,使作物氮素利用效率与硫素利用效率协同提高,在保持植株一定氮素和硫素积累量的基础上,通过提高氮素和硫素的收获指数促进籽粒产量的增加,夏玉米季SCU+PCU,PSCU,处理的氮肥利用率均高于Urea处理分别为19.6%,15.65%,实现作物对氮素的高效利用。

This paper mainly explored the difference of coating CRFs （Controlled-release fertilizers） in crop N, sulfur accumulation, distribution and using efficiency. In the pool culture of two consecutive years, the mixture CRFs （SCU＋PCU）, PSCU （Polymer-sulfur coated urea） and PCU （Polymer-or resin-coated urea） were used to research the relationship between crop N and S content, accumulation, harvest index, grain yield, using efficiency of N and S in summer corn-winter wheat rotation. The results showed that： the application of the mixture CRFs and PSCU could significantly promote crop growth, increase plant uptake of N and S, and the utilization efficiency of crop N and S was synchronously improved; on the base of maintaining a certain plant N and S accumulation, increasing the harvest index of N and S could improve grain yield, and realized high efficiency use of N for crop. By increasing the harvest index of N and sulfur to promote the increase of grain yield, the yield of grain of summer corn of SCU＋PCU and PSCU treatment has an increase of 19.60% and 15.65% compared with urea treatment.