Effects of chemical fertilizer reduction combined with organic fertilizer application on soil biological characteristics,yield and quality of cherry tomato
The effects of chemical fertilizer reduction combined with organic fertilizer on soil enzymes and microorganisms,growth,yield and quality of cherry tomato were studied,in order to clarify the response of cherry tomato to fertilizer reduction combined with organic fertilizer in yellow soil in southern China,and to provide reference for high yield and quality production technology of cherry tomato and soil fertilizer cultivation.Taking cherry tomato'feijiao'as the research object,six treatments were set up on the basis of 5.0 t/hm2 organic fertilizer application,namely CK(conventional fertilization),T1(10％reduction of chemical fertilizer),T2(20％reduction of chemical fertilizer),T3(30％reduction of chemical fertilizer),T4(40％reduction of chemical fertilizer)and T5(50％reduction of chemical fertilizer).The results showed that the activities of acid phosphatase,sucrase and cellulase in soil were increased by 8.8％,14.6％and 31.9％with chemical fertilizer reduction combined with organic fertilizer,respectively,and catalase activities were decreased by 14.9％,while the activities of urease were decreased by excessive reduction of chemical fertilizer(T4,T5).The chemical fertilizer reduced by 10％-50％,the number of fruits per panicle increased by 20.8％,18.3％,17.3％,12.9％and 12.7％,respectively,and the yield increased by 10.6％,10.5％,8.4％,0.6％and 0.2％,respectively.The quality of cherry tomato was improved,the soluble sugar content was increased by 0.9％-8.2％,the soluble solid content was increased by 4.7％-11.3％,the vitamin C content was increased by 1.3％-3.5％,the content of edible acid was decreased by 8.5％-12.8％,and the sugar-acid ratio was increased by 1.0％-2.5％.Therefore,the most suitable nutrient management strategy was to reduce the amount of conventional chemical fertilizer by 20％-30％and apply moderate organic fertilizer by 5.0 t/hm2.
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