Effects of Different Fertilization Treatments on Soil Microbial Biomass, Soil Enzyme Activities and Related Nutrients in Continuous-cropping Sugarcane Field
[Objective] This study was conducted to expound the fertility improvement effect in continuous-cropping sugarcane field and provide reference for establishment of rational sugarcane fertilization system and improvement of soil quality in continuous-cropping sugarcane field.[Method] The soil in the experimental region is latosolic red soil which was planted with sugarcane for 11 years continuously,and 8 treatments including sole application of chemical fertilizers,sole application of organic fertilizer,and combined application of organic fertilizer and chemical fertilizers were designed according to different fertilization measures.The effects of different fertilization treatments on soil microbial biomass,soil enzyme activities and related fertility factors were determined.[Result] Different fertilization treatments all showed soil microbial biomass N,C and P and activities of soil acid phosphatase,catalase,sucrase and urease higher than the CK.Soil microbial biomass N increased by 5.56％-67.13％,soil microbial biomass C increased by 4.01％-20.40％,and soil microbial biomass P increased by 6.39％-67.02％.The activity of acid phosphatase was improved by 12.96％-35.19％,the activity of catalase was improved by 18.24％ -78.93％,the activity of sucrase was improved by 3.00％-42.00％,and the activity of urease was improved by 1.21％-23.43％.However,the soil nutrients of different fertilization treatments increased non-significantly (P＞0.05).Soil microbial biomass N,C and P and activities of acid phosphatase,catalase and urease were in significant (P＜0.05) or very significant correlation (P＜0.01) with contents of soil rapidly available P,rapidly available K and total N.[Conclusion] The evaluation of improvement of soil fertility in continuous-cropping sugarcane field using soil microbial biomass and enzyme activities as indexes is more comprehensive and sensitive.
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NSTL
万方数据
维普
