不同保护性耕作模式对冬小麦生长发育及水分利用的影响

Effects of Different Conservation Tillage Practices on Winter Wheat Growth and Water Use Efficiency

通过不同保护耕作模式在旱地冬小麦上应用效果定位研究，结果表明：4种保护性耕作模式及秸秆还田处理与对照相比，都有不同程度的增产作用，增产幅度为2．66％～6．65％。其中，以保护耕作夏免耕＋秋免耕处理效果最好，增产达显著水平。从成产三因素分析，4种保护性耕作模式主要通过增加冬小麦的穗粒数和千粒重来提高产量；从干物质积累与土壤水分的角度分析，4种保护性耕作处理通过降低冬小麦前期干物质积累，减少水分的无效消耗，为中后期籽粒的灌浆提供了相对充足的水分。图4，表2，参13。

With long-term experiments, this paper studied the effects of different conservatiousl tillage practices on dryland winter wheat for two years .The results showed that the four kinds of conservatiousl tillage and straw returning-back-to-field technique improved wheat yield from 2.66% to 6.65% than conventiousl tillage with various extent, increased yield. Maize （zero-till） - wheat（zero-till） treatment was the best which enhanced yield significantly. Yield analysis indicated that the conservatiousl tillage patterns gained high production by more grains per spike and 1009 gains weight.They produced less biomass in early growth stage to reduce soil water consumpion to save more soil water for grain filling.