The Effect Of Reduced Fertilizer And Intercropping On Crop Carbon And Nitrogen Storage And Soil Carbon And Nitrogen Fixing

Chemical fertilizer not can make crop yield improved and also bring crisis for theecological environment. The current environmental issues in agriculture has become more andmore serious, many an irrational use of chemical fertilizer, which not only affect the cropyield, soil quality, food safety, and even a threat to our survival environment. Now the farmersgeneral use of fertilizer can be reduced or not? Intercropping in the agricultural productionprocess is always respected planting pattern, what is its significance for modern ecologicalagriculture? So to find the reasonable fertilization level, ecological significance forintercropping can provide scientific basis for the ecological and economic benefits ofagricultural balance.In this paper, field plot experiments were conducted in the farmland of Guanzhongtypical plain area, to study the influence of the distribution of reduced fertilizer on yield ofsummer maize, maize carbon and nitrogen content in different organs, maize plant carbon andnitrogen storage and soil carbon, nitrogen density; And also to study the influence of thedistribution of3:2corn and soybean intercropping yield of spring corn and springsoybean,organs carbon and nitrogen content, spring corn and spring soybean plant carbon andnitrogen storage and soil carbon, nitrogen density and nitrogen, at last based on the researchanalysed the measures of soil carbon and nitrogen fixing. The important conclusions got areas the followings:(1) With the reduction of fertilizer changed more and more, the yield of summer maizesignificantly decreased, but the chemical fertilizer reduction of30%and constant fertilizationyield no significant difference; corn soybean3:2under intercropping, land equivalent <1,negative intercropping.(2) The reduction of fertilizer and intercropping did not significantly affect the carboncontent of each organ of crops, Carbon ratio to grain> stem> leaf> leaf> root containingmaize organs, soybean organs carbon ratio to grain> stem> leaf> root; Under fertilizerreduction conditions, maize root, stem, leaf nitrogen content showed a gradual decrease trendfrom the seedling to jointing stage, nitrogen content in root, stem, leaf was leaf> stem> root,showed a significant difference. With the reduction of fertilizer, maize root, stem, leafnitrogen content was significantly decreased, the maximum at maturity stage and the lowest atseedling stage; Effects on roots,stems, leaves nitrogen content under corn and soybean intercropping are not obvious.(3) With the reduction of fertilizer, maize plant carbon and nitrogen storage hasdecreased significantly, but no obvious decrease fertilizer reduction30%; soybean and maizeintercropping could significantly increase crop carbon and nitrogen storage.(4) Farmland topsoil (0-60cm) carbon and nitrogen content changed larger underfertilizer reduction and intercropping, and with the soil depth increasing,the soil carbon andnitrogen content showed a decreasing trend.(5) Fertilizer reduction failed to significantly reduce soil nitrogen density, fertilizationcould increased topsoil carbon density significantly, but fertilization had no significantinfluence on all soil(0-100cm) carbon density; Soybean maize intercropping in some extentcould improve soil nitrogen density, but not obviously affected soil carbon density.