1. Do not use a large amount of undeveloped cake fertilizer in the greenhouse, because cake fertilizer has a small carbon to nitrogen ratio and decomposes quickly.
2. Do not use ammonium sulphate in the greenhouse in winter, as this will cause high temperature and high concentration of ammonia and organic acids in the local area to easily burn roots. Secondly, it is forbidden to use ammonium bicarbonate. Ammonium sulfate is a physiologically acidic 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 emitted, which is unfavorable to the growth of vegetables.
3. Do not use chlorine-containing fertilizers in greenhouses. Chloride ions can reduce the starch and sugar content of vegetables, which will reduce the yield, and the residual chloride ions in the soil can cause soil acidification and easily cause soil decalcification.
4. Greenhouse vegetables under drought conditions
Vegetables should be fertilized carefully. Applying fertilizer under the condition of insufficient water will not only fail to give full play to the fertilizer effect, but will also cause the concentration of the soil solution to rise suddenly, making it easy to burn the roots of vegetables. Therefore, vegetable fertilization should be combined with irrigation, and fertilization should be opened in the furrow, and the fertilizer should be bury tightly before irrigation and topdressing.
5. Do not use too much diammonium phosphate in the greenhouse in winter to avoid the volatilization of ammonia and cause ammonia damage.
6. It is not suitable to apply potassium fertilizer in the later period in the greenhouse in winter. Vegetables generally require a lot of potassium fertilizer before and after flowering, and topdressing will lose fertilizer efficiency.
7. Disperse phosphate fertilizers carefully in the greenhouse. Phosphate fertilizer is suitable as a base fertilizer or concentrated in the soil layer with dense roots in the early stage of vegetables. It is not suitable to apply zinc fertilizer in the greenhouse in winter. When vegetables are deficient in zinc, 0.05%~0.2% zinc sulfate solution can be sprayed on the leaves. Be careful not to apply iron fertilizer to the soil. Because iron is easily converted into insoluble compounds by soil fixation, it loses its fertilizer effect. Iron is not easy to flow on the leaves, you can use 0.1%~0.3% ferrous sulfate solution to spray evenly on vegetable leaves.
8. Do not apply rare earth micro-fertilizers directly into the soil in the greenhouse in winter. You can use 0.05%~0.07% rare earth fertilizer solution to spray on vegetable leaves.
9. In winter, use a large number of element water-soluble fertilizers combined with seaweed water-soluble fertilizers or humic acid-based water-soluble fertilizers to increase the ground temperature, care for the roots, and avoid damaging the roots of crops.
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