Effects Of Chemical Fertilizer Combined Comminuted Straw Application On Water Use Of Winter Wheat

Through comminuted crop straw to improve soil structure, which is an important way of achieving high yield and saving water and fertilizer. it can enhance the holding capability and effectiveness of soil moisture and nutrient, reduce soil evaporation and invalid consumption of crop water, and reduce fertilizer usage. The differences of water consumption of winter wheat were studied at its growth stages under the treatments of chemical fertilizer combined comminuted straw and current chemical fertilizer with seven different varieties including winter wheat"xinong9871","ligao6","yanmai9710","shaan139","hengguan35","zhongyuan98-68"and"xiaoyan22". And the effects of S on wheat yield and water-use efficiency were investigated among seven varieties of winter wheat. The main conclusions are listed as follows:1. The total water consumption was similar among different varieties of winter wheat under the condition of chemical fertilizer combined comminuted straw and current chemical fertilizer. The soil evaporation of winter wheat at their growth stages,with seven different varieties of winter wheat, had no significantly difference under the same treatment. The soil evaporation of different winter wheat varieties was inhibited significantly by chemical fertilizer combined comminuted straw, and the ratios of restraining soil evaporation ranged from 8.02% to11.60%. The amount of evaporation about 12mm was translated into transpiration owing to the use of chemical fertilizer combined comminuted straw. The soil moisture of farmland from the surface to 60cm was affected by chemical fertilizer combined comminuted straw under winter drought. In addition, the evaporation of chemical fertilizer combined comminuted straw was less than that of current chemical fertilizer during winter drought.2. The germination and tillering of winter wheat were promoted by the technology of chemical fertilizer combined comminuted straw, the biomass of winter wheat was increased effectively, and the promotion of wheat spikes per unit area was increased through it. But the weight of the first spike was lower. The yield of winter wheat was enhanced by the technology of chemical fertilizer combined comminuted straw mainly through improvement of wheat spikes and grain weight per unit area. The yield and water use efficiency in treatment of chemical fertilizer combined comminuted straw were, respectively, 5.44%～13.14% and 4.91%～10.72% higher than the treatment of current chemical fertilizer.3. Under the treatment of chemical fertilizer combined comminuted straw with seven varieties of winter wheat, xiaoyan22 was the best among the winter wheat varieties according to the degree of water consumption and the effect of drought resistance, and drought resistance of xiaoyan22 was better than that of the rest. Tillering ability of winter wheat"xinong9871","ligao6","sha'an139"and"zhongyuan98-68"were stronger than that of"xiaoyan22", but yield and water use efficiency of winter wheat"xi nong9871","zhongyuan98-68"and"xiaoyan22"were the highest among seven varieties.