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In recent years , the mulched drip area of rapid development , but fertigation more experience , such as fertilizer ratio , the amount of the distribution is unreasonable, affecting the efficiency of drip irrigation of cotton fertilization . This test uses plot experiment combined pot experiment , by field comparison test and completely randomized block experimental design , the use of regression analysis , correlation analysis , mathematical statistics method and alkaline hydrolysis diffusion method , distillation , colorimetry , chemical analysis method , cotton nitrogen and phosphorus fertilizer application methods , utilization, and fertilizer , as well as nitrogen and phosphorus in the soil displacement law study , designed to explore reliable fertilization parameters and the scientific fertilization techniques to guide agricultural production . The test results show that nitrogen fertilizer mainly by mobile and distribution facilities with water droplets of moisture migration drops nitrogen fertilizer can move with the water allocated to the various parts of the plow layer moist peaks ; fixed drops applied phosphate fertilizer susceptible to soil , difficult to move its lateral and vertical movement occurs mainly in the 0 ~ 10cm surface , the moving distance is short , centralized distribution . Harvest cotton plant samples to laboratory analysis, according to the subtraction. Finally drip irrigation of cotton nitrogen fertilizer utilization rate of 48.58% to 53.15% the phosphate fertilizer utilization rate of 18.73% to 24.84% . Which phosphate fertilizer based facilities with the the drop facilities handling fertilizer utilization rate up to 22.67% to 24.84% , phosphate fertilizer all base facilities or drops all facilities increased by 2.51 to 4.66 percentage points . The cotton harvest processing production alone paid- lint yield are the highest of phosphate fertilizer base application with drops of facilities processing . Are critical the mulched drip phosphate fertilizer applied . Law according to the movement and distribution of drip irrigation, fertilization of nitrogen and phosphorus in the soil , nitrogen can be used in all with water droplets facilities , and drops P fertilizer is not easy to move , mainly distributed in 0 ~ 10cm surface is not conducive to late cotton root absorption , phosphate fertilizer should adhere the main base facilities , drip applied , supplemented by the principle , soil phosphate fertilizer in drip irrigation cotton field soil quality over 80% of the base application , the remaining phosphate fertilizer drops facilities ; sandy soil voids reduce phosphate fertilizer - based application rate may be appropriate to increase the amount of drops administered . Aquic soil drip irrigation cotton fertilization on fertilizer effect equation 223.35kg/hm ~ 2 and 86.55kg/hm ~ Best of nitrogen and phosphorus ratio to 1:0.39 .
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