Although greenhouse vegetables have the same features as general vegetable fields and field fertilization, they require more stringent technology. Pay attention to the following points:
To increase the application of organic fertilizer: organic fertilizer can not only improve the soil, but also provide nutrients. Moreover, in the decomposition and utilization, carbon dioxide can be produced and accumulated in the greenhouse, which can increase the application of "gas fertilizer" for vegetables, which is beneficial to increase photosynthesis of vegetables and increase vegetable yield.
Organic fertilizer should be applied after decomposing: Because of fresh pig manure, manure, green manure and crop straw, a large amount of organic acid, ammonia, hydrogen sulfide, nitrogen oxides, etc. will be produced during the decay process. It not only harms the roots of vegetables, but also ammonia, nitrogen oxides, etc. that escape the soil, accumulate in the greenhouse, and cause poison to vegetables. The study found that if the ammonia content in the air in the greenhouse reaches 5ppm and the nitrous acid gas reaches 2.5 to 3ppm, the vegetables will be harmed.
It is necessary to fertilize the soil: commonly used potassium chloride, potassium sulfate, ammonium chloride, ammonium sulfate, etc., after being applied to the soil, the sulfate ion and chloride ion are absorbed and utilized little, and when applied in general vegetable fields and fields, Will leak with the water, reducing the harm. However, in the greenhouse, it is often accumulated in the soil, which increases the acidification of the acidic soil. Therefore, the acidic soil is not suitable for application, and it can be applied to alkaline soil, while the calcium magnesium phosphate fertilizer, lime nitrogen and the like are not suitable for application on alkaline soil, and can be applied. On acidic soil. Generally, greenhouse vegetables are preferably low-toxic, non-residual fertilizers such as urea, ammonium bicarbonate, diammonium phosphate, potassium nitrate or ammonium nitrate. Urea application and ammonium bicarbonate also have the effect of adding "gas fertilizer" to greenhouse vegetables.
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