First, the performance and causes of soil deterioration 1. Soil consolidation: due to a large number of chemical fertilizers, ignoring the application of organic fertilizer, soil fertility activity decline, lack of organic matter. Breathability decreases, aerobic microbial activity declines, soil ripening slows, causing soil compaction, vegetable root development, and thus affecting vegetable growth. 2. Increased salinization: As a result of over-application of chemical fertilizers in greenhouses, salt ions increase in the soil, pH value increases, and soil salinization worsens, which prevents normal root water absorption and affects plant growth. 3. Lack of trace elements: Due to the continuous cropping of vegetables in greenhouses, it absorbs trace elements such as zinc, boron, molybdenum, copper, and manganese in the soil, but no supplementary application of trace fertilizers results in declining trace elements in the soil, and even lead to sheds. Room soil is a serious lack of trace elements, affecting the growth and development of vegetables. 4. The shallow layer of living soil becomes shallow: As the vegetables in greenhouses are often intercropped and intercropped, most of them are manually planted, and little or no deep plowing of the cattle plow is used to make the plough layer of the living greenhouse shallow, impeding the root system of vegetables. Under the bar. 5. Diseases and Insects Accumulation: As a result of years of continuous cropping of vegetables in greenhouses, the accumulation of pathogens and diseases in the soil has increased, and the damage has become worse. The root system has thus been damaged and rotted, and even the whole plant has died. Due to serious diseases and insect pests and increased use of pesticides, vegetables are contaminated. Second, the control measures for soil deterioration 1. Rotary crop replacement: In the ground, do not plant one vegetable species every year in the season, and change crops and plant another vegetable species. Such as melons and onions rotation, can reduce the occurrence of pests and diseases, reduce the toxic effects of toxins. 2. Apply Organic Fertilizer: Apply Organic Fertilizer to Improve Soil Aggregate Structure, Increase Soil Air Permeability, Maintain Water and Fertilizer, Regulate Heat, and Spare Soil to Reduce Soil Salinization, Promote Vegetable Root Development, and Improve Its Resistance to Diseases and Resilience . 3. Appropriate leisure: After planting the greenhouse for many years, it is possible to grasp the season and appropriate leisure. For example, in the open air vegetable field, it is possible to use the winter leisure to deepen the soil, freeze the soil, eliminate the disease and insect source, and restore the soil strength. 4, the application of micro-fertilizer: micro-fertilizer can be used as base fertilizer or top-dressing, to supplement the content of the soil, zinc fertilizer for base fertilizer (zinc sulfate) Mushi 1 - 1.50 kg, boron (borax) 0.3 - 0.5 kg, Mo fertilizer (ammonium molybdate) 0.10-0.20 kg, copper fertilizer (copper sulfate) 1-2 kg, manganese fertilizer (manganese sulfate) 2-3 kg. Zinc sulfate outside the root can be used 0.05-0.20% concentration, borax can be used 0.10-0.25% concentration, ammonium molybdate available 0.02-0.05% concentration, available 0.02-0.05% copper sulfate concentration, manganese sulfate available 0.10-0.20% concentration. 5, deep-turning the land: the use of time intervals in each vegetable cultivation, deep plowing, such as the intercropping can not be deep plowing with cattle plow, with digging deep digging the ground, thickening the mature soil layer, enhance the soil water retention fertilizer capacity.
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