水氮耦合对河套灌区春小麦干物质积累与运转的影响

Effect of Water-nitrogen Coupling on Dry Matter Accumulation and Translocation of Spring Wheat in Hetao Irrigation District

以永良4号为试验材料,研究不同灌水施氮量下春小麦干物质积累与运转特点,探讨适合河套灌区春小麦种植的水肥管理模式。结果表明,小麦的干物质积累以成熟期的W2N2最高,达到27540.8kg/hm2。W1水平下所有处理的干物质积累率较慢,W2水平下N2干物质积累率明显高于其他处理。花前同化产物转运量、转运效率、贡献率及花后同化物贡献率均以W2N2最高,分别达到0.69g·stem-1、26.97%、35.93%、77.89%,而花后同化物积累量在不同处理间差异并不明显;说明W2N2是适合当地小麦生产的灌水施肥模式。

In order to provide a basis for reasonable water and fertilizer management in spring wheat planting in⁃Hetao Irrigation District,the characteristics of dry matter accumulation and translocation of spring wheat under differ⁃ent irrigation and nitrogen rates are studied using Yongliang No.4 as the test material.The results showed that the dry matter accumulation of wheat is highest in the mature stage of W2N2,reaching 27540.8 kg/hm2.The dry matter accumulation rates of all treatments are slower at W1 level,and the N2 dry matter accumulation rate at W2 level is significantly higher than those of other treatments.The pre-anthesis translocation capacity,translocation efficiency,contribution rate and post-anthesis assimilation contribution rate are the highest in W2N2,reaching 0.69 g.stem-1,26.97%,35.93%and 77.89%respectively,while there is no significant difference in post-anthesis assimilate accumulationbetween different treatments.Therefore,W2N2 is recommended as an irrigation and fertilizer model suitable for local wheat production.