Abstract:

In order to prove nitrate nitrogen temporal and spatial distribution in the gneiss entisols, field experiments of fertilizer were conducted to study the effects of phosphate fertilizer and organic manure on nitrate nitrogen content under the different of N fertilizer. The results showed that, fertilization could significantly increase crop yield. The yield of nitrogen and phosphorus fertilization was significantly higher than that of single nitrogen and organic manure fertilizer; the crop yield had not significant difference under the different levels of nitrogen. In seeding, the content of soil nitrate improved as nitrogen application increased. In jointing, with the depth increased, the content of soil nitrate improved in 0-60 cm soil profile and reduced in 60-80 cm. The content of soil nitrate improved with nitrogen application increased, and the content was higher than others in each soil layers during heading and filling stage. The content of soil nitrate was single nitrogen > nitrogen and phosphorus > organic fertilizer in harvesting. The nitrate content was seedling > jointing > heading and filling > harvesting in different soil layers, and gradually reduced with the change of nitrogen demanding and rainfall among the whole growth stage.