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Do not apply ammonium sulfate and ammonium bicarbonate. It is a physiological acid fertilizer. After application, it will increase the acidity of the soil and destroy the soil structure. After the application of ammonium bicarbonate, a large amount of ammonia gas is volatilized, which is unfavorable for vegetable growth.
Do not apply chlorine-containing fertilizer chloride ions to reduce the starch and sugar content of vegetables, so that the quality of vegetables is deteriorated, the yield is reduced, and chloride ions remain in the soil, which can lead to acidification of the soil and easily cause decalcification of the soil.
Do not fertilize vegetables under drought conditions. It is a water-loving crop. When the soil is dry, fertilization will not only give full play to the fertilizer effect, but also increase the concentration of the soil solution, which will easily cause the vegetables to burn. Vegetable fertilization should be combined with irrigation, and it is necessary to ditch and fertilize, and then fertilize the fertilizer after it is buried, or topdress with water.
Do not apply more diammonium phosphate vegetables to a large amount of nitrogen and potassium, and require less phosphorus. Even if the phosphate fertilizer is replenished, the diammonium phosphate should not be mixed with an alkaline fertilizer such as grass ash to avoid ammonia volatilization, which may cause ammonia damage.
Do not apply potassium fertilizer in the late growth stage. Generally, potassium fertilizer is needed before and after flowering, and then gradually decreases. Moreover, phosphorus is easily absorbed and solidified by the soil and loses its fertilizer effect. Therefore, phosphate fertilizer is suitable as a base fertilizer or concentrated in the root layer dense soil layer in the early stage of vegetables.
Do not apply iron and rare earth fertilizers to the soil. Iron ions are easily converted into poorly soluble compounds by the soil and lose their fertilizer efficiency. Therefore, iron fertilizer should not be applied to the soil. Iron is not easy to flow on the blade, it should be sprayed on the foliar surface. It can be sprayed evenly on the vegetable leaf surface with 0.1%-0.3% ferrous sulfate solution, or 0.05%-0.07% rare earth micro-fertilizer solution in vegetable leaves. Spray on the surface, spray 50-60 kg of solution per acre.
Seven in the greenhouse
Do not apply cake fertilizer as a whole because the cake has a small carbon to nitrogen ratio and quick decomposition, and it is easy to produce high temperature and high concentration of ammonia and organic acid, which is easy to burn. The cake fertilizer should be broken, soaked in human feces and urine for about 3 weeks, and then applied after high-temperature fermentation.
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