The Research Of Continuous Cropping Obstacl Factors And Treatment Technology In Greenhouse Facility Cultivation

In recent years, greenhouse cultivation developed rapidly, but under the pressure from market economy,facility agriculture generally developed towards the scale cultivation and singleness cultivation. Too much attachment of importance to labor productivity while ignoring land productivity,caused a direct result of the facility soil obstacles in continuous cropping , the pH enomenon of declining occurred in production efficiency and product quality deterioration.In some places decline even threaten the continued use of agricultural facilities. Research carried out a series of tests and analysis of soil in greenhouse cultivation continuous cropping in Hui'an County (Huangtang Town, Zishan Town, Luoyang town) of Quanzhou City, Fujian Province.The study showed that:1. After greenhouse cultivation, the nutrients and salt of soil were significantly higher than those in open field.The pH value, the content of nitrate, nitrite, available N, available P and available K showed mostly significant difference between in greenhouse soil and in open field during different years, as well as the content of soil nutrient and salt between different years in greenhouse was also large causing greenhouse soil salinization, soil acidification and other obstacles to continuous cropping. Therefore, accumulation of chemical elements N, P, K, and excessive length of greenhouse cultivation soil were the main obstacles to continuous cropping .2. Through the control of greenhouse soil secondary salinization the results showed that Great washed salt and cabbage buried underground pipe on the yield significantly, an increase of 42.49% and 46.44%. Laying underground pipe was taken as a result of vertical salt water washing method, with a high rate of desalination, water desalination and less deep soil, etc., while the bottom of the plot after washing salt salt also easily picked up, so the laying of underground pipe drainage systerm to wash salt was one of effective measures of solution to secondary salinization in facilities cultivation.3. The comparative results of different ratio of organic fertilizer and inorganic fertilizer of Chinese cabbage cultivation on yield and nitrate content showed that the organic fertilizer and inorganic fertilizer combined application can significantly increase production, increase correspondingly 28.11 percent, 21.87 percent and 9.44 percent more than single application of inorganic fertilizer (control), Ratio 1:2 of organic fertilizer and inorganic fertilizer was the most significant, the application combined both organic fertilizer and inorganic fertilizer can reduce the content of nitrate and nitrite of soil in greenhouse vegetable cultivation.4. The change of soil nitrate N content of chinese cabbage in greenhouse cultivation in different years showed that: With the number of years of cultivation in greenhouses, the soil nitrate content increased by follow, but the corresponding of the open field did not significantly add. The increase of soil nitrate in different years occurred in the entire profile, not only in the surface soil, from 0 ~ 100 cm soil in greenhouses, nitrate content in each soil layer was higher than corresponding soil layer in open field. In some soil layers at the 80 ~ l00 cm depth the nitrate content was even several times more than the surface soil of open fieldi.When greenhouse cultivation of chinese cabbage, the content of nitrate, nitrite was higher than those in open field.With the increase of in greenhouse life, the content of cabbage nitrate, nitrite was significantly increased. But the content of cabbage nitrate, nitrite showed no significant difference while it growed in open field.