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1. Do not overdo the application of unfertilized farmyard manure. Farmhouse manure and other farmyard manure should be fertilized at high temperature before application to avoid burning vegetable seedlings due to the application of unfertilized farmyard manure, resulting in reduced production.
2. Do not apply ammonium bicarbonate. After the application of ammonium bicarbonate, a large amount of ammonia gas will be volatilized, which is unfavorable for the growth of vegetables, and is easy to produce ammonia damage. It is preferable to use urea with long fertilizer efficiency.
3. Do not apply chlorine-containing fertilizers. Chloride ion can reduce the starch and sugar content of vegetables, and reduce the yield and quality of vegetables. Moreover, chloride ions remain in the soil, which can lead to acidification of the soil, causing decalcification of the soil and causing soil compaction.
4. Do not apply too much diammonium phosphate. Vegetables require a lot of nitrogen and potassium fertilizers, and require less phosphate fertilizer. Diammonium phosphate only accounts for 18% of nitrogen, does not contain potassium, and has a high specific gravity of phosphorus. Therefore, it is not suitable to apply diammonium phosphate in greenhouses. If the land is deficient in phosphorus, the phosphate fertilizer can be used as the base fertilizer or concentrated in the root layer dense soil layer in the early stage of vegetable growth. It is best not to disperse the application to prevent the soil from being absorbed and solidified and losing fertilizer efficiency.
5. It is not suitable to apply potassium fertilizer in the late growth stage of vegetables. Vegetables generally require more potassium fertilizer before and after flowering, and then gradually decrease. If potassium fertilizer is applied later in the growth period, there is not much potential for increasing yield.
6, the application of zinc, iron fertilizer should be appropriate. Foliar application of 0.05%-0.20% zinc sulphate solution for vegetable zinc deficiency, but not excessive application, to avoid burning the leaves, affecting the growth of vegetables. Do not apply iron fertilizer to the soil, because iron is easily converted into poorly soluble compounds by soil and loses fertilizer efficiency. It should be sprayed with foliar spray. It can be sprayed evenly on vegetable leaves with 0.1%-0.3% ferrous sulfate solution. Face.
7. Do not apply rare earth micro-fertilizer directly into the soil. The correct way is to spray 0.06% rare earth micro-fertilizer solution on the vegetable leaf surface, and spray 50 kg of solution per acre.
Scientific and rational fertilization of greenhouse vegetables
Greenhouse vegetables can be fertilized scientifically and reasonably to obtain high yield and high efficiency. However, some greenhouse vegetables are poorly fertilized by vegetable farmers. Although many fertilizers are used, they cause crop failures. So, what fertilization techniques should be paid attention to during the production of greenhouse vegetables?
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