ÃÞ »¨ ѧ ±¨ Cotton Science 2009£¬21(1)£º51-56
Effects of Nitrogenous Fertilizer Strategies on the Nitrogen Accumulation in Cotton Field Soil and Cotton Functional leaves Abstract: Recent years, researchers have tried their best to control nitrogenous fertilizer loss and its pollution to environment. The mixed nitrogen nutrition becomes one of the new methods to enhance the effectiveness of nitrogen utilization and reduce the nitrogen loss. In the field conditions, enhanced ammonium nutrition (EAN) by using the nutrification inhibitor in soil becomes a very good ways to achieve the mixed nitrogen nutrition. Cotton is sensitive to nitrogen utilization. Meanwhile, due to growing in the hot season, the irrational nitrogenous fertilization utilization will lead to not only the poor cotton growth but also the larger nitrogen loss and environment pollution. With Bt-transgenic cotton 33B as experimental plant and Dicyanodiamide£¨DCD£©as nitrification inhibitor, the effects of nitrogenous fertilizer strategies(including DCD and non-DCD treatment in different nitrogen levels) on the nitrogen accumulation in cotton field soil and cotton functional leaves were discussed. The results showed: 2% DCD treatment enhanced ammonium absorption£¨ increased NH4+-N from 0.70% to 112% in the main stem leaves and from 8.84% to 46.47% in the bearing stem leaves £©and restrained nitrate absorption of cotton(decreased NO3--N from 0.20%-22.68% in the main stem leaves and from 0.10% to 28.03% in the bearing stem leaves)£¬the extent of influence is different from one growth stage or nitrogen level from another; at the same time, it reduced the content of rudimental total nitrogen£¨decreased extent from 0 to 14.39%£©and maintained the higher content of ammonium nitrogen£¨increased extent from 1.11% to 17.83%£©in cotton and enhanced the efficiency of nitrogen fertilizer as well as saved nitrogen resource. These above mentioned further showed that it was important to treat cotton with EAN from the physiological and ecological perspectives.
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