Effects Of Different Fertilization Methods On The Content Of Soil Nutrients And Nutrients Uptake And Utilizations In Double Cropping System Of Wheat And Maize In Chao Soil

Filed experiments were conduct to study different fertilization systen on the main soil nutrient supply of wheat maize rotation system, and wheat maize nutrient uptake and accumulation at different soil nutrient content,and Soil nutrient balance at different different fertilization。The main results were as follows:Different fertilization methods at chao soil, The yield had no big difference at the first maize season。The custom had the maximum output at second wheat season,and the optimization and high input were similar to lower yield。The high input in the sandy loam chao soil and custom in the fine sandy chao soil had the maximum output,the optimization was lower but similar to the other treatment。At different fertilization methods,the custom or the high input had the most dry matter and the nitrogen accumulation and optimization had the third。The P and K accumulation had no big difference in different treatment。The high input treatment of fine sandy chao soil had big accumulation of K,but the sandy loam chao soil had small difference in different treatment。Applying a lot of Nitrogen caused organ had big content of nitrogen when the maturity at the wheat season but had no big difference at the maize season,the organ had lower content of N when the continuous nor-fertilizer of nitrogen。P had not the trend at different P fertilizer level。The high input treatment of fine sandy chao soil make the organ have high content of K,but the sandy loam chao soil had not this trend。At the second wheat season,the nutrient accumulation of Straw in the high input treatment was higher than the custom and optimization and achieve a significant level。Optimization was Minimum and closed to the custom,and custom had the most accumulation of N in the kernel。The nutrient accumulation of straw and kernel had no big difference at the maize season。In wheat maize rotation cycle, with the increase in nitrogen application rate ,the content of soil nitrate had the trend of increasing at the 0-90㎝ soil layer which the main layer the crop uptaking。Compare with the ck,at the 0-30㎝ layer,the content of nitrate in optimization was lower than the custom fertilization and high input。At 30-90㎝ layer,the content of nitrate in optimization was similar to ck,and the high input are highest。Custom closed the high input,and In some period more than the high input。It indicated the 0-90㎝ soil nitrate content Maintained at a relatively high level when nitrogen fertilize reached a certain amount。From the customary nitrate content is closer to high input and higner than the high input at some time,we know the rate of custom nitrate fertilizer has reach the peak of the best fertilizer。The high input treatment significantly increased the available P content at 0-30㎝ layer,but bellow the 30㎝ the available phosphorus content had no big difference。It the rotation cycle,the treatment of custom and optimization had the similar available P and available K。The treatment of high input enhance the available K at surface layer of sandy loam。The treatment of sandy loam chao soil was not obvious than the fine sandy chao soil。The available K had not big difference below the 30㎝ at different teatment。Between maize and wheat rotation,P has the highest nutrient use efficiency at the sandy aera,and K was second and N was third。We can get conclusion between different soil and different treatment,the custom and optimization had More appropriate nutrient use efficiency。Ck had high nutrient use efficiency,but the yield was lower。The high input had the lower nutrient use efficiency。The optimization had the most RE,AE,PFP,and the high input was least。At the conditions of straw applicaion on soil fertility,the nutrient of N,P,K had Surplus at one rotation system。the optimization had small Surplus of N,and the Surplus of P and K were similar。The high input had a large number of nutrient Surplus。...