1. It is not suitable to apply large amounts of uncooked cakes and fat cakes with small carbon-nitrogen ratios, fast decomposition, and easy to produce high temperatures and high concentrations of ammonia and organic acids, which can easily cause burning of roots. The cake fat should be broken, soaked with human waste for about 3 weeks and used after high temperature fermentation. 2. It is not suitable to use ammonium sulfate or ammonium bicarbonate to be a physiological acid fertilizer, which will increase the acidity of the soil after application and damage the soil structure. A large amount of ammonia is volatilized after the ammonium bicarbonate application, which may cause ammonia damage. 3, should not be applied chloride chloride chloride can reduce the starch and sugar content of vegetables, so that the quality of deterioration, reduced output, and chloride ions remain in the soil, can lead to soil acidification, easily lead to soil decalcification, causing compaction. 4, should not be dry and fertilized vegetables are hi water crops, fertilization in the soil when the drought, not only can not fully exert the effect of fertilizer, but also a sudden increase in the concentration of soil solution, easy to cause vegetable root burning. Therefore, the fertilization of vegetables should be combined with irrigation. The fertilization should be carried out strictly, and then the irrigation should be carried out or the fertilizer should be applied along the water. 5, should not be more than diammonium phosphate vegetables need a lot of nitrogen and potassium, 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, phosphorus is 46%, potassium-free, does not meet vegetables. Growing needs. Diammonium phosphate should not be mixed with alkaline fertilizers such as grass ash so as to avoid ammonia volatilization and ammonia damage. 6. It is not advisable to top up the potassium fertilizer in the later period. Before and after flowering, more potassium is needed, and gradually decreases. 7. It is not appropriate to disperse phosphate fertilizers. Phosphorus is easily absorbed and solidified by the soil and loses fertilizer efficiency. Therefore, phosphate fertilizers should be used as basal fertilizers or concentrated in root-dense soil layers in the early stage of vegetables. 8, should not be applied phosphate fertilizer, zinc fertilizer because of phosphorus, zinc does not produce the effect of wolfberry should not be applied every year, can be applied again every 1 to 2 years, vegetables can be used when zinc deficiency 0.05~0.2% zinc sulfate solution foliar spray. 9. It is not appropriate to fertilize iron fertilizer into the soil. Iron can be easily transformed into insoluble compounds and lose its fat. Iron is not easy to flow on the leaves and it should be sprayed with foliar spray. 0.1-0.3% ferrous sulfate solution can be sprayed evenly on the leaves. 10, should not be directly applied to the soil of rare earth fertilizer can be 0.05% ~ 0.07% rare earth fertilizer solution foliar spray, 50-60 kg per mu solution, can be mixed with the application of pesticides. China Agricultural Network Editor
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