Countermeasures For Soil Obstacle Of Continuous Vegetable Cropping In Plastic Green House In Wenzhou

With the development of Cultivation in plastic green house, large-scale vegetable production become popular while soil obstacle of continuous vegetable cropping become more and more serious. The obstacle limited the growth of crops and damage the economic benefits of farmers. The stable vegetable production, as well as sustainable development of Wenzhou was greatly restricted. Any single correction can not solve the problems of continuous vegetable cropping obstacles, and there are not any systematic analysis and research of countermeasures at present. It made sense to develop a integrated countermeasures of low-cost and high efficiency according to the planting structure and soil climate characteristics of Wenzhou.Properties of soil obstacle was analysed for continuous vegetable cropping in plastic green house in Wenzhou.(1) Soil salt content in green house used for different number of years was2to5times higher than that in the open air. Green houses of3to5years have an average soil EC of1.1mS/cm while those of8to9years have an average soil Ec of1.46mS/cm.(2) Soil adification caused by continous cropping are especially obvious in the green house soil of central plain in Wenzhou with an average pH4.91.(3) Green house soil which had been used for over5years had excessive P and N and low Ca、Mg、B content and the physiological diseases caused by unbalanced nutrient were very common.(4) Blight, as well as bacterial wilt, was the most popular soil-diffused disease in Wenzhou central plain.Based on the above research, varieties of countermeasures for soilobstacle of continuous vegetable cropping in plastic green house in Wenzhou were studied. The results showed:The special fertilizer for obstacle was especially effective in controlling soil Acidification, reducing salt content, reforming soil Physical Characteristics and improving plant growth.The compositive countermeasure was researched and an effective general mode was advanced. Using the special fertilizer for obstacle, combined with other countermeasures such as orgnic fertilizer, disinfecting seeding period, covering soil with thin film, etc. had good result.