First, it is best not to use a large amount of unripe cakes in greenhouses because the ratio of carbon and nitrogen in cakes is small and the decomposition is fast.
Second, do not use ammonium sulfate in greenhouses during the winter season. This will make local areas prone to high temperatures and high concentrations of ammonia and organic acids, making it easier to burn roots. Secondly, the application of ammonium bicarbonate is prohibited. Ammonium sulfate is a physiological acid fertilizer, which will increase the acidity of the soil and damage the soil structure after application. After the application of ammonium bicarbonate, a large amount of ammonia is volatilized, which is unfavorable for the growth of vegetables.
Third, greenhouses do not use chemical fertilizers containing chlorine. Chloride ions can reduce the starch and sugar content of vegetables, which will reduce the yield. Moreover, chloride ions will remain in the soil, which can lead to acidification of the soil and easily cause decalcification of the soil.
4. Dry conditions Greenhouse vegetables should be carefully fertilized. Fertilizing in the absence of sufficient water will not only give full play to the fertilizer effect, but will also cause a sudden increase in the concentration of the soil solution, which will make it easier for the vegetables to burn their roots. Therefore, the fertilization of vegetables should be combined with irrigation, and it is better to fertilize and fertilize the fertilizer after burying the fertilizer.
5. Do not use excessive amounts of diammonium phosphate in greenhouses during the winter to avoid ammonia volatilization and ammonia damage.
Sixth, winter greenhouses are not suitable for topdressing potassium fertilizer in the later period. Vegetables generally require more potash before and after flowering, and late-stage topdressing will lose their effectiveness.
VII. Carefully spread phosphate fertilizers in greenhouses. Phosphate fertilizers are suitable as basal fertilizers or are concentrated in root-dense soil layers in the early stages of vegetables.
VIII. It is not appropriate to apply zinc fertilizer in greenhouses in winter. When zinc deficiency occurs in vegetables, 0.05%-0.2% zinc sulfate solution can be sprayed on the leaves.
9. Be careful not to apply iron fertilizer into the soil. Because iron is easily converted by the soil into poorly soluble compounds, it loses its effectiveness. Iron is not easy to flow on the leaves and can be evenly sprayed on the leaves of vegetables with 0.1%-0.3% ferrous sulfate solution.
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