8 kinds of fertilizer greenhouse vegetables can not be used
1, do not use large amounts of vegetables in greenhouses without decomposed cake fertilizer
Because the cake has a small carbon to nitrogen ratio and a fast decomposition, it is easy to produce high temperature and high concentration of ammonia and organic acid, which is easy to burn. The cake fat should be broken, soaked in human dung and urine for about 3 weeks, and then used after high-temperature fermentation.
2. Do not apply ammonium sulfate in vegetable greenhouses in winter, and prohibit the application of ammonium bicarbonate.
Ammonium sulfate is a physiologically acidic fertilizer that increases the acidity of the soil and destroys the soil structure after application. After the application of ammonium bicarbonate, a large amount of ammonia gas is volatilized, which is unfavorable for vegetable growth.
3. Do not apply chlorine-containing fertilizers in vegetable greenhouses.
Chloride ion can reduce the starch and sugar content of vegetables, make the quality of vegetables worse, the yield is reduced, and the chloride ions remain in the soil, which can lead to acidification of the soil and easily cause decalcification of the soil.
4, greenhouse vegetables should not be fertilized under drought conditions
Vegetables are water-loving crops that fertilize when the soil is dry. Not only can the fertilizer not be fully exerted, but the concentration of the soil solution will suddenly increase, making it easy for the vegetables to burn.
Therefore, the application of 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.
5. Do not apply more diammonium phosphate in vegetable greenhouses in winter.
Vegetables require large amounts of nitrogen and potassium and require 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, vegetable greenhouses are not suitable for late application of potash
Vegetables generally require more potassium before and after flowering, and should be gradually reduced in the future.
7. It is not suitable for the application of phosphate fertilizer in vegetable greenhouses.
Phosphorus is easily absorbed and solidified by the soil, losing fertility. Therefore, phosphate fertilizer is suitable as a base fertilizer or concentrated in the root layer dense soil layer in the early stage of vegetables.
8, in the winter in the vegetable greenhouse is not suitable for the application of phosphate fertilizer, zinc fertilizer
When zinc is deficient in vegetables, it can be sprayed on the foliage with 0.05%-0.2% zinc sulfate solution.
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