The Systematic Evaluation Of The Continous Cropping Patterns Of Strawberry-rice In Greenhouse

Recently, the protected cultivation of strawberry is gradually arisen in our country, and the planting area is in expansion. But strawberry can not be continuously cropped, it leads to contradiction between exchange land for rotation and fixed facilities, and continuous cropping obstacle becomes obvious. These problems seriously affect the yield and quality of strawberry, and become main factors that restrict mass production of strawberry. Therefore, studying on effective ways of solving continuous cropping obstacle of strawberry and improving benifits of protected cultivation have important realistic meanings. This paper, based in greenhouse planting for strawberry in College students Pioneering Park in Xingeng, Wangting, Suzhou city and reached on two patterns of summer sowing rice in greenhouse and conventional planting strawberry after summer fallow, studied on defining the continous cropping pattern of strawberry-rice in greenhouse effecting on soil nutrient, crop yield, economic and environmental benefit with the different input of inorganic fertilizer and organic fertilizer by setting net planting rice, and put forward to main technical specifications of the continous cropping pattern of strawberry-rice in greenhouse. Meanwhile, it provides some dicision-making basis for net planting rice. The main achievements are as following:(1) Variation characteristics of physical and chemical properties of soil. Compared with soil in summer fallow, the physical and chemical properties of soil become obvious after planting rice. After planting rice in summer, the soil nutrient is decreased. Different fertilization treatments during rice growing period have different effects on change of soil nutrient content in which phosphorus and potassium are obvious. Meanwhile, total salt content in soil is obviously decreased and pH value and EC value are improved after planting rice. Continous planting rice effects more obvious. So, net planting rice in strawberry in greenhouse has better regulation effect on maintaining balance in accumulation of nutrient, slowdown soil acidification and regulation effect of secondary salinization. But planting rice increases the emission of greenhouse gases. Planting rice in greenhouse in summer decreases soil available nutrient. It means that some measures should be taken to improve fertilization of strawberry. To improve the yield of strawberry, the amount of fertilizer should be increased.(2) Yield and benefits. The yield of net planting rice after strawberry is lower than common planting. And applying inorganic fertilizer has more yield than organic fertilizer. So, under the protected cultivation, improving the yield of net planting rice is a effective way. Planting rice in strawberry has some effects on the growth of strawberry. Because of the delay of transplanting-time, the vegetative growth of strawberry is affected and the yield decreases12.0%. But the quality improves. Sugar acid ratio in rice stubble is38.7%more than in common greenhouse and Vc content increases by31.7%.(3) Strawberry-rice in greenhouse is a multiple cropping pattern of economic crop and grain crop. It has good ecological, economic and social synergism. It’s a effective way to develop organic farming and ensure food safety with net planting rice. In the mode of configuration, such as, choosing a shorter growth duration and higher yield of variety to adapt the demand of crops for rotation of strawberry.