1. Vegetable greenhouses do not use large amounts of cooked cake fat. Because the ratio of carbon to nitrogen in the cakes is small, the decomposition is fast, and high temperatures and high concentrations of ammonia and organic acids are easily generated locally, and roots are easily burned. The cake fat should be broken, soaked with human waste for about 3 weeks, and then used after high-temperature fermentation.
2. Do not use ammonium sulfate in the vegetable greenhouse in winter and disable the use of ammonium bicarbonate. Ammonium sulfate is a physiological acid fertilizer that will increase the acidity of the soil and damage the soil structure after application. After the application of ammonium bicarbonate, a large amount of ammonia is volatilized, which is unfavorable for the growth of vegetables.
3. Do not use chlorine-containing fertilizers in vegetable greenhouses. Chloride ion can reduce the starch and sugar content of vegetables, make the quality of vegetables worse, the yield is reduced, and chloride ions remain in the soil, can cause acidification of the soil, easily lead to decalcification of the soil, causing soil compaction. 4. Vegetable greenhouses should not be fertilized under conditions of drought. Vegetables are hi-water crops. Fertilizing when the soil is dry, not only can the fertilizer effect not be fully exerted, but also the concentration of soil solution can suddenly increase, making it easier for the vegetables to burn their roots. Therefore, the fertilization of vegetables should be combined with irrigation, and fertilization should be carried out to fertilize the fertilizer after it is rigorously buried, or to top-dress with water.
5. Do not apply more diammonium phosphate in vegetable greenhouses in winter. Vegetables need a lot of nitrogen and potassium, and they need less phosphorus. For example, the ratio of NPK required by eggplant is 3:1:4, cucumber is 3:1:10, tomato is 6:1:12, and diammonium phosphate is 18% nitrogen and phosphorus is nitrogen 146%. Potassium is contained, so it is not appropriate to use more diammonium phosphate in the greenhouse. In addition, it should be noted that diammonium phosphate should not be mixed with alkaline fertilizers such as grass ash to avoid ammonia volatilization and ammonia damage.
6. It is not appropriate to topdress potassium fertilizer in vegetable greenhouses. Vegetables generally require more potassium before and after flowering and gradually decrease thereafter.
7. It is not suitable to disperse phosphate fertilizers in vegetable greenhouses. Phosphorus is easily absorbed by the soil and loses its effectiveness. Therefore, phosphate fertilizers are suitable as basal fertilizers or concentrated in root-dense soil layers in the early stage of vegetables.
8. It is not appropriate to apply phosphate fertilizer and zinc fertilizer in vegetable greenhouses in winter. When zinc deficiency occurs in vegetables, 0.05%-0.2% zinc sulfate solution can be sprayed on the leaves.
9. Be careful not to apply iron fertilizer into the soil. Because iron is easily converted into insoluble compounds by soil fixation, it loses fat. Iron is not easy to flow in leaves and should be sprayed on the leaves. It can be sprayed on the leaves of vegetables with 0.1%-0.3% ferrous sulfate solution.
Bqf Frozen Flying Squid Cleaned,Bqf Frozen Squid Tube Head Block,Bqf Frozen Squid Tentacle And Tubes
ZHOUSHAN GENHO FOOD CO.,LTD , https://www.genho-food.com