1. Adding fully decomposed organic fertilizer, promoting compound fertilizer and bio-organic fertilizer. Fresh organic farmyard fertilizer can be applied after fully maturity. Adding organic fertilizer can improve soil structure and soil buffering performance, reduce fertilizer dosage and reduce salt. harm.
2. Promote balanced fertilization of organic fertilizers, nitrogen, phosphorus, potassium and trace element fertilizers. Appropriately reduce the amount of NPK fertilizer, supplement potassium fertilizer, and apply trace elements such as boron, zinc and molybdenum. Before the scientific fertilization method of greenhouse vegetables has not been perfected, the fertilizer dosage should be in the mid-range level, and it is not necessary to unilaterally pursue high yield and blindly fertilize.
3, the selection of suitable fertilizer varieties is best to use less chemical fertilizers, do not excessive application of ammonium nitrogen fertilizer and ammonium nitrate fertilizer, advocate the application of low nitrogen high concentration compound fertilizer.
4. Master the principle of thin fertilizer and diligent application. The dosage of chemical fertilizer should not be too much. The ammonium bicarbonate is less than 25 kg/mu, the ammonium sulfate is less than 15 kg/mu, the urea is less than 10 kg/mu, and the superphosphate is less than 25 kg/mu. When topdressing, it should be “less diligently applied†to avoid the use of excessive fertilizer to cause fertilizer damage and the accumulation of salt in the soil.
5. Advocate full-layer deep application of fertilizer or ditch application soil to protect fertilizer, reduce volatilization loss, and reduce direct damage to seedlings. Do not apply chemical fertilizer in the shed. The point should be more than 10 cm away from the crop roots. It is necessary to apply the soil deeply and water it after applying it. Generally, 70%-80% of the total amount of chemical fertilizer is used as a full-scale deep application of the base fertilizer.
6, the implementation of water and drought rotation for simple greenhouses, winter and spring vegetables, summer and autumn rice.
7. When loose soil and air release are found to cause gas damage in the shed, it is necessary to loosen the soil in time to release harmful gases as much as possible. At the same time, it is necessary to strengthen the release of the wind, and the wind should be properly ventilated on the cloudy day. First, the small release in the morning when the shed is released. Second, the large release at noon. The temperature in the shed at the noon is too high. The air release time should be extended as much as possible to minimize the concentration of harmful gases.
8. For vegetable bases and sheds with permanent facilities, other measures can be taken to reduce salt accumulation, summer and autumn combined with drought-resistant irrigation or salt washing; take measures to deepen the soil; covering mulch or straw can reduce soil water evaporation and reduce salt harm.
9, the occurrence of fertilizer damage, timely watering and dilution to solve the fertilizer damage can be sprayed on the surface of 2116 or compound microbial fertilizer 500 times liquid, the effect is better.
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