不同玉米秸秆还田量对土壤肥力及冬小麦产量的影响

Effects of different amount of maize straw returning on soil fertility and yield of winter wheat

通过田间随机区组设计试验,研究了不同玉米秸秆还田量对接茬麦田土壤碳、氮肥力及冬小麦产量的影响。结果表明,秸秆还田可以增加土壤有机质和缓解土壤氮流失,提高土壤微生物碳、氮的固持和供给效果,增加土壤微生物量C/N,提高土壤供肥水平。从不同玉米秸秆还田量的效应对比与回归分析,进一步明确在黄土高原有灌溉条件的地区,施N 138 kg/hm2,玉米秸秆还田量9000 kg/hm2,能有效提高土壤肥力,可使接茬冬小麦显著增产7.47%。

Effects of different returnning amount of maize straw on soil fertility and yield of winter wheat was studied using randomized block design.The results showed that straw returning can increase soil organic matter content and reduce soil total nitrogen loss,enhance the capacity of soil microbial fixing and supplying C and N,increase C/N,and change the distributionof soil microbial community.Higher soil microbial C/N and redistribution of original soil microbial community was propitious to the soil organic transformation and mineralize carbon decomposition,as consequence,improve the soil nutrient supply.Our results indicate that under condition of study area,applying N 138 kg/ha,combined with returnning amount of maize straw 9000 kg/ha can enhance soil fertility and increase yield by 7.47%,significantly.