Investigation On Protected Vegetable Planting Pattern And The Application Of Ecological And Effective Crop Rotation

In order to realize the sustainable development of vegetable production in Minhang District,and provide technical support for the production of high quality,yield and efficiency,in the study,we investigated different cropping pattern of the vegetable planting in different base in Minhang District,and studied on the integration and demonstration of some leading technology,including new varieties,green prevention and control,water saving technology and shading net.We also chose two eco-effective cropping pattern for the study on soil conservation technology.The results are as follows:1.Through the experiment,we chose 12 eco-effective cropping patterns whose Mu output value over 15000 yuan with reasonable rotation and multiple crop index.The cropping patterns include tomato-cowpeacauliflower,cucumber-cowpea-alfalfa,tomato-celery-winter vegetables,tomato-cucumber-green vegetable,tomato-green vegetable-cucumber,cucumber-cowpea-radish,pepper-cucumber-celery,tomato-mixian-lace lettuce,eggplant-Chinese little greens-heat resistant greens,cherry tomato-green vegetable-celery,cucumber-green vegetable-celery,green vegetable-cowpea-green vegetable.2.The researches showed that,the rotation of the solanaceous fruits vegetables requiring more phosphorus and the leaf vegetables requiring more nitrogen,and the rotation of deep and shallow root vegetable were more reasonable.The soil with above cropping patterns,there was a little change on the Soil p H value,which was suitable forvegetable production.The total salt and nitrate content were maintained in a reasonable range,did not show a phenomenon of secondary salinization.Content of N,P,K in soil showed no significant difference3.The researches showed that,the content of N,P,K in soil affected the yield and quality of cucumber.The research results showed that,the commendation amount of N,P,K fertilizer were 18kg/667m~2,6kg/667m~2 and 25kg/667m~2 respectively under protected cultivation in Shanghai area.Different couplings of water and fertilizer have different effects on the production of cucumber.The effect order is amount of fertilizer application>irrigation amount> fertilizer ratio>irrigation period.4.The best economic program of application of water and fertilizer for cucumber was the program T5.The application amount of N,P,K fertilizer were 15.65?6.2?15.5kg/mu respectively,under application of 1.5tons per mu organic base fertilizer.The irrigation water amount of the whole growing period was 145m~3/ mu.