Effect of Straw Returning on the Dynamic of Nitrogen Nutrient and Soil Microbial Biomass Nitrogen
The located trails were conducted to soil microbial biomass nitrogen under maize study the effects of straw returning on dynamic of nitrogen nutrient and straw full smash returning and wheat straw rotary tillage returning combined with synchronal fertilization application. The results showed that the wheat and maize straw returning could fulfill the requirement of nitrogen nutrient at the stage of wheat jointing. The total nitrogen of soil in all treatments of straw returning or fertilization application was at minimum at the stage of jointing during wheat growth. However, the minimum value of the soil total nitrogen was arisen at the booting stage, continuing to the filling stage. As to the treatments of the wheat and maize straw returning but no fertilization application, the soil nitrogen was seriously deficient during late phase of wheat growth. The content of alkali-hydrolyzable nitrogen took on trend of ascending during the growth of wheat after straw returning. Only fertilization application or straw returning could build up soil microbial biomass nitrogen in some degree, but their aftereffects were deficient. Straw returning and fertilization application facilitated remarkably soil microbe activity biomass nitrogen. and could increase continually the content of soil microbial biomass nitrogen.
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NSTL
万方数据
维普
