How to Prevent the Greenhouse Soil Aging

Formula fertilization  technology and measuring soil fertilization technology should be widely promoted. Farmers should adopt the scientific fertilization methods, and combined with the basic fertilizer and top-dressing.  The basic fertilizer should be put on the rotten organic fertilizer, together with the phosphate fertilizer and potassic fertilizer. And the top-dressing should be done according to different growth period of the crops, and make sure the times of fertilizing. During the crops growth period, such as roots and tubers swollen, it should be refertilized.  The basic fertilizer is divided into three methods--deep fertilization, layer by layer manuring, and furrow application. All the fertilizaer should be done with water.  To promote the foliar fertilization technology can strictly control the amount of chemical fertilizer, especaially can reduce the amount of nitrogen fertilizer. Farmers should avoid blindly fertilizing and partial to nitrogen.

The nutrient content should be the first factor to the fertilizer which should contain less heavy metals toxic substances but with high purity. Pay more attention to the using of trace element fertilizer and promote the using of nitrogen, phosphorus, and potassium.  The organic fertilizer should be widely used in the greenhouse, especially the rotten processed quality livestock and poultry manure. In the greenhouse amanagement, the comprehensive measures are better choices, such as scientific flood rotation, food grain, melon food crop rotation. The garbage and sewage irrigation are strictly forbidden for the greenhouse.  

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