1. Avoid excessive application of unripe farmhouse shed vegetables when using farmyard fertilizers to fully decompose, because there is no farmyard manure after decomposing bacteria and eggs, after the application of vegetables, it is easy to spread the disease. In addition, if the farmhouse fertilizer is put into a greenhouse and then decomposed, ammonia burning burn vegetable seedlings will be produced.
2. Avoid application of chemical fertilizers such as potassium chloride, potassium sulfate, ammonium sulfate, etc. that are easily applied to increase the concentration of soil solution. Acidic ions, chloride ions, etc. are not easily absorbed by crops and remain in the soil, causing concentration of soil solution. Increased, damage the normal growth of crops. Therefore, fertilization in greenhouses should use ammonium phosphate, diammonium phosphate, urea, calcium superphosphate, ammonium nitrate, and special BB fertilizer.
3. Avoid topsoil application N fertilizer application of topsoil, its more chance of contact with the air, ammonia produced by the volatilization of nitrogen is easy to poison plants, but also reduce the effect of fertilizer. The deep application of chemical fertilizers can reduce the accumulation of nitrate in crops and increase the utilization rate. The method of topdressing is to use deep trenching, followed by soil tightness after application and timely watering to dilute the fertilizer.
4. Avoid excessively chasing chemical fertilizers in the greenhouse to strictly follow the principle of “a small number of times†to prevent excessive fertilization. The excessive use of chemical fertilizers at one time not only causes waste, but also increases the concentration of soil salt and endangers vegetables. The limits for applying fertilizer once per acre for different soils are: 15 kg of ammonium nitrate sandy loam, 18 kg of loam and clay; 10 kg of urea-sand loam, 12 kg of loam or clay; 40 kg of superphosphate-soil loam, 50 kg of loam or clay Diammonium phosphate sand loam 25 kg, loam or clay 35 kg
Sardine Canned In Tomato Sauce
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