《Table 3 Soil nutrient reduction amounts in the early and late rice cropping fields and LAD (Mean±st

《Table 3 Soil nutrient reduction amounts in the early and late rice cropping fields and LAD (Mean±st   提示:宽带有限、当前游客访问压缩模式
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《Quantitative Evaluation on the Comprehensive Benefit of Controlled-Release Fertilizer in Typically Middle-Low Yield Rice Field》


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The data in the table are mean±standard deviation;the upper and lower case letters indicate significance of difference with the same letter indicating insignificant difference,and different letters indicating significant difference (at the levels of P<0.

As shown in Table 3,after harvesting,the soil nutrient reduction amounts were significant in both the early and late rice cropping fields and LAD.According to the analysis on soil nutrients(Table 4),in the treatments of FVOL,SVOL,LADVOL,the application of CRF had no negative effects on soil environment,and the soil p H remained balanced with no acidification.However,the difference in p H values with other treatments was extremely significant.After variance analysis of F-test of multiple comparisons using Duncan's new multiple range method,the differences were extremely significant(P<0.05)in the contents of organic matter,available N,available P,available K of all treatments[6],and high nitrogen absorption and utilization rate indicated less nitrogen fertilizer loss[7].It not only saved fertilizer,helped increase the economic benefits of planting rice,increase the income of farmers,but also reduced the pollution of water bodies and the eutrophication of rivers and lakes,which was of great significance for protecting the ecological environment and human health[2-4,8].The test results of soil testing and formula testing showed that the available N content in the second rice cropping fields were of fields with significant low-yield.The N content of treatment SVOLwas(-39.533 3±8.025 1)kg/hm2,of treatment SXNKwas(-33.733 3±2.020 7)kg/hm2,and of treatment SFFPwas(-31.400 0±12.124 3)kg/hm2,and the amounts of soil nutrient reduction reached an extremely significant level[9].