These 10 kinds of fertilizer greenhouse vegetables can not be used! Must know
1. Don't apply large quantities of unripe cake fertilizer to the vegetables in the greenhouse
Because the carbon-to-nitrogen ratio of the cake fertilizer is small and decomposes quickly, it is easy to produce high temperatures and high concentrations of ammonia and organic acids locally, and it is easy to burn roots. The cake fertilizer should be broken up, soaked with human feces and urine for about 3 weeks, and then used after high temperature fermentation.
2. Do not apply ammonium sulphate in vegetable greenhouses in winter, and prohibit the application of ammonium bicarbonate
Ammonium sulphate is a physiologically acidic fertilizer. After application, it will increase the acidity of the soil and destroy the soil structure. After application of ammonium bicarbonate, a large amount of ammonia gas is volatilized, which is detrimental to 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, deteriorate the quality of vegetables and reduce the yield, and the residual chloride ion in the soil can cause acidification of the soil and easily cause decalcification of the soil.
4. Don't fertilize the vegetables in the greenhouse
Vegetables are water-loving crops. Fertilizing when the soil is dry, not only can the fertilizer effect not be fully exerted, but also the concentration of the soil solution will suddenly increase, and it is easy to burn the vegetables. Therefore, vegetable fertilization should be combined with irrigation, ditch fertilization should be applied, and the fertilizer should be irrigated and then irrigated or fertilized.
5. Don't apply diammonium phosphate in vegetable greenhouses in winter
Vegetables require large amounts of nitrogen and potassium, and less phosphorus. 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 suitable to apply potassium fertilizer in the later period in the vegetable greenhouse
Vegetables generally require more potassium fertilizer before and after flowering, and then gradually decrease.
7. Phosphate fertilizer is not suitable for scattered application in vegetable greenhouses
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 soil layer with dense root system in the early stage of vegetables.
8. It is not suitable to apply more phosphate fertilizer and zinc fertilizer in vegetable greenhouses in winter
When vegetables lack zinc, 0.05%-0.2% zinc sulfate solution can be sprayed on the foliage.
9. Be careful not to apply iron fertilizer into the soil
Because iron is easily fixed by the soil and converted into insoluble compounds and loses its fertility. Iron is not easy to flow on the leaves, it should be sprayed on the leaf surface, and 0.1%-0.3% ferrous sulfate solution can be evenly sprayed on the leaf surface of the vegetables.
10. Don't apply rare earth micro-fertilizer directly into the soil in vegetable greenhouses in winter
You can use 0.05%-0.07% of rare earth micro-fertilizer solution to spray on the vegetable leaf surface, spray 50-60 kg of solution per mu.
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