Shed vegetable fertilization "six don't"
Do not apply ammonium sulfate and ammonium bicarbonate ammonium is a physiological acid fertilizer, after application will increase the acidity of the soil and damage the soil structure. After the application of ammonium bicarbonate, a large amount of ammonia is volatilized, which is unfavorable for the growth of vegetables.
Do not use chloride-containing chemical fertilizers. Chloride ions can reduce the starch and sugar content of vegetables. The quality of vegetables will be degraded and the yield will be reduced. Moreover, chloride ions will 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. 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, and vegetables can be easily burned. The fertilization of vegetables should be combined with irrigation, and fertilization should be carried out. After fertilizing the fertilizer, it should be filled with water, or it can be top-dressed with water.
Do not use more diammonium phosphate vegetables need a lot of nitrogen and potassium, you need less phosphorus. Even if additional phosphate fertilizer is applied, diammonium phosphate should not be mixed with alkaline fertilizers such as grass ash to prevent the volatilization of ammonia, thus causing ammonia harm.
Do not topdress potassium fertilizers in the late growth stage. Potassium fertilizers are generally required before and after flowering and gradually decrease afterwards. And 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.
Do not apply iron or rare earth fertilizers to the soil. Iron ions are easily converted into insoluble compounds by the soil and lose their fertility. Therefore, iron fertilizers should not be applied to the soil. Iron is not easy to flow on the leaves and should be sprayed with foliar. It can be evenly sprayed on the leaves of vegetables with 0.1%-0.3% ferrous sulfate solution, or 0.05%-0.07% rare earth fertilizer solution on vegetable leaves. Surface spray, spray 50-60 kg solution per acre.
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