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Mao Guofang(Shanghai Agrotechnology Extension Service Center,Shanghai 201103 )Chu Jinhai(Soil and Fertilizer Station of Minhang District of Shanghai,Shanghai 201109)  
From the point of view of soil ecological environment concerning retention ofsoil basal fertility,conversion of farmland nutrients,absorption of nutrients by rice plants andeffect of increasing rice output,four types of paddy soils in Shanghai suburbs were selected assampling points in orientation tests for investigating the evolution of soil ecologicalenvironment in zero-tillage and shallow-ploughing rice fields after wheat cropping. Throughthe analyses of soil chemical and physical characteristics,microorganism composition,enzymeactivites,oxidizing and reducing materials,Eh value and nutrient absorption by rice plants,the preliminary investigation was completed. The results of 3-year tests showed that thetrend of changes in soil fertility was the same in the shallow-ploughing treatments and zerotillage treatments; the soil total microorganisms, enzyme activity and the Eh value in ricefields during irrigation period were all markedly higher in the shallow-ploughing treatmentsthan in the zero-tillage treatments ;the amounts of N,P,K absorbed by rice plants and theeffect in increasing rice output were also higher in the shallow-ploughing treatments than inthe zero-tillage treatments,which indicated that the shallow ploughing should give a bettereffect on conversion and supply of soil nutrients in rice fields as compared to the zero tillage.Therefore,in rice procudtion in Shanghai the zero tillage should only be taken as a kind ofsupplementary cultivation measure and practiced rationally. In rice cultivation management,the irrigation and drainage system in zero-tillage rice fields should be kept unblocked, inorder to enhance the drainage ability of soil. The environments of water, air and heat intillage layer should be improved by rational water regulation during irrigation and drainingperiods for promoting rice growth,meanwhile it is necessary to increase the application rateof organic manure and improve the soil granular structure in tillage layer.
【Fund】: 上海市农委1994年科技兴农攻关课题!“水稻现代农艺规范化栽培模式研究与开发”
【CateGory Index】: S34
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