冬水前移对冬小麦生长及水分利用效率的影响

he study is to explore the optimal management of winter watering to develop strong seedling before winter, and improve the wheat growth, thus increase the grain water use efficiency and result in higher yield of wheat, sowing under the conditions of threshed corn straw back to the field by the rotary machine. To study the winter watering time effect, four watering time treatments were designed. They were November 10, November 25, December 10 (traditional watering time used as a control) and December 25. Comparing with the non-winter watering wheat, winter watering compacted the soil, and adjusted the bulky soil density. It also help the root closely touched to the soil, and enhance the enzyme activity, thus enrich the soil nutrition level and improve the tillering and secondary root growth. It is interesting to note that early winter watering could compensate the winter wheat growth when it was compared with the control treatment. It can stimulate the stem numbers before winter, secondary root number, and increased the root dry weight per plant. Under early winter watering condition, the lifespan of flag leave was extended, and the chlorophyll contents increased, and the photosynthesis was also improved. All these result in final head number increased by 5.37% to 1.66%, while the weight thousand kernel by 3.03%-0.55%.It was found that under the November 25 treatment, the yield increase by 8.40% and water use efficiency by 5.76% to 22.05kgm-1m-2. At this stage the seedling was just at the early tiler stage when the seedling plant has 3 leaves.