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一、土壤营养条件。建造大棚时,应选择土层深厚、肥沃、松软的沙壤地块,浇水方便,排水顺畅,以满足多种蔬菜生产发育的需要。如因条件限制,可通过精耕细作,改良土壤,培肥地力的办法创造优越条件。 二、土壤营养障碍。①土壤溶液浓度高。由于不注意底肥的多少,盲目施肥造成的。易使土壤溶液浓度升高的肥料有:硝酸钾、氯化钾、硫酸镁等。②土壤含盐浓度高。塑料大棚长期处于覆盖条件下,养分很少随雨水流失,每年又
First, soil nutrient conditions. When building greenhouses, should choose deep, fertile, soft sandy soil plots, easy watering, drainage and smooth to meet the needs of a variety of vegetable production and development. As a result of conditional restrictions, we can create superior conditions through intensive cultivation, soil improvement and soil fertility cultivation. Second, soil nutrition disorders. ① high concentration of soil solution. Due to not pay attention to the amount of base fertilizer, blindly caused by fertilization. Fertilizers easy to increase the concentration of soil solution are: potassium nitrate, potassium chloride, magnesium sulfate and so on. ② soil salt concentration. Long-term plastic covers in the coverage conditions, nutrient loss with the rain rarely, every year