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Improving Effects of Crop Rotation and Fallowing on Continuous Cucumber Cropping Soil in Solar Greenhouse

WU Huan-tao,WEI Min,YANG Feng-juan,WANG Xiu-feng(College of Horticulture Science and Engineering,Shandong Agricultural University/State Key Laboratory of Crop Biology,Taian 271018,China)  
The pot experiment was carried out to study the effects of crop rotation of several vegetable crops with cucumber and fallowing on continuous cucumber cropping soil in solar greenhouse.The results indicated that compared with continuous cropping,crop rotation could reduce the bulk density and increase the porosity of soil,while fallowing could increase the bulk density and reduce the porosity of soil;crop rotation and fallowing could increase soil pH,decrease EC and balance soil nutrients,therefore they improved soil physical and chemical properties and reduced soil secondary salinization and acidifying;crop rotation and fallowing were beneficial to improving soil microbial flora and enhancing the soil enzyme activity,so the amounts of bacteria and actinomyces increased,the amount of fungi decreased,meanwhile the amounts of ammonifier and nitrifier significantly increased.Among the different systems,crop rotations of scallion-cucumber and maize-cucumber were the optimum patterns for soil improving.
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