农田秸秆覆盖对冬小麦水氮效应的影响

通过田间试验研究了杨凌红油土农田秸秆覆盖条件下冬小麦的水氮效应.结果表明,秸秆覆盖使土壤水分状况明显改善,从而使补充灌水的效果相应减小,氮肥的作用更加突出;无覆盖条件下,水氮交互效应均为负值,而秸秆覆盖时水氮有正的交互作用.旱地秸秆覆盖条件下更应重视养分的投入.无秸秆覆盖条件下小麦取得高产的基础是良好的土壤底墒和充足的氮肥.秸秆覆盖使小麦达到最高产量所需要的灌水量降低,灌水时期后延.不论有无秸秆覆盖,拔节期灌水对冬小麦籽粒产量没有显著影响.

Effects of irrigation and nitrogen fertilization on winter wheat yield under straw mulch

A field experiment was conducted on a Hongyou soil of Yangling to investigate the effects of irrigation and nitrogen fertilization on wheat yield under straw mulch.The results showed that under straw mulch,N fertilization contributed more to the increase of wheat yield than irrigation,because soil moisture condition was improved greatly.The interaction between irrigation and nitrogen fertilization was negative in no-mulch treatment,but positive under straw mulch.For dryland,more attention should be paid to the input of nutrients when straw mulch was applied.High moisture content in soil profile before sowing and sufficient N input were essential for good harvest when field was not mulched.Under straw mulch,the irrigation rate for a maximum yield was reduced,and the optimum time of irrigation was postponed.Wheat grain yield had no relation to the irrigation during jointing stage in both no-mulch and straw mulch treatments.