Current Status Of Nutrient Input And Soil Nutrient Content Change Characteristics In Solar-greenhouse In Quwo County

By surveying the present situation of fertilizer in solar-greenhouses which have been cultivated for 1～10 years, we found the change regularity of the soil nutrient and found out the problems of the fertilizer. We selected 90 solar-greenhouses for soil samples and analyzed soil samples in the laboratory. This paper studies the variation of nutrient in the solar-greenhouses soil in different years of cultivation. The paper got four main results by analyzing data.(1)Many kinds of fertilizers were applied. The quality of fertilizer was excessive. Kinds of fertilizers were more than 17 in base fertilizer and more than 85 in topdressing under cultivating 1-10 years solar-greenhouses. The quality of organic fertilizer was ranged from258.1 t/hm2to368.lt/hm2. As solar-greenhouses cultivation time growth the quality of organic fertilizer was reducing, by contrast, the quality of inorganic fertilizer was increasing.(2)The qualities of inputted nutrient in the solar-greenhouse in different years of cultivation were excessive. With the planting years increasing in the greenhouse, the quality of fertilizer and nutrient were increasing. The qualities of N, P, K in solar-greenhouse in different planting years were 2287.8kg/hm2～4621.1kg/hm2,1092.6kg/hm2～1401kg/hm2, 2438. 1kg/hm2～4689.2kg/hm2, respectively.(3)Because of applied lots of fertilizer, the nutrient was accumulated in the top layer of soil. The contents of N03--N were excessive in planting 3,6 and 9 years solar-greenhouse. The contents of NO3--N were 101.81mg/kg, 74.7mg/kg,126.95mg/kg in the soil layer of 0～20cm, respectively. With the using time of greenhouses increasing, the contents of N03--N were increasing in the soil, and the result showed the NO3--N accumulation and elution were obvious on upper and lower soil layer. (4)Because of heavy dressing, organic matter, total nitrogen, effective phosphorus and available potassium were accumulated in the top layer of soil, and with planting years increasing in the greenhouse, the contents of organic matter, total nitrogen, effective phosphorus and available potassium were accumulating. Soil pH in the greenhouse showed a declining tendency in the greenhouse.