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Ammonium nitrate and other nitrate-nitrogen fertilizers are generally not suitable for application to vegetables. When nitrate-nitrogen fertilizer is applied to vegetable fields, the nitrate content in vegetables will be multiplied. Nitrate is easily reduced to nitrite and nitrite in human body. It is a highly toxic substance that is extremely harmful to the human body. Ammonium chloride, potassium chloride and other chlorinated fertilizers are not suitable for application to tomatoes. After the chlorine-containing fertilizer is decomposed in the soil, ammonium or potassium ions are adsorbed by the soil or absorbed by the vegetables. When the concentration reaches a certain level, the roots of the vegetables will be Produces poison, which can cause serious vegetable death.
Leafy vegetables should be sprayed with nitrogen fertilizer, and the leaves of the vegetables should be sprayed with nitrogen fertilizer. After the ammonium ions are in contact with the air, they are easily converted into nitrate ions and absorbed by the leaves, and the leafy vegetables have a short growth period, which makes it easy to make nitric acid. Salt accumulates in the leaves, so avoid spraying nitrogen on the foliage of leafy vegetables.
The application of micro-fertilizers in vegetables can promote high-quality and high-yield vegetables, but the demand for trace elements in vegetables is extremely small. Excessive application of micro-fertilizer not only causes economic waste, but also is prone to poisoning and polluting the environment. Under normal circumstances, the amount of ferrous sulfate per acre should not exceed 3.25 kilograms, the monthly dosage of manganese sulfate and manganese chloride should not exceed 2.05 kilograms, the amount of copper sulfate should not exceed 2 kilograms per acre, and the amount of borax and boric acid per acre should not exceed 1.25 kilograms. .
Leafy vegetables should be sprayed with nitrogen fertilizer, and the leaves of the vegetables should be sprayed with nitrogen fertilizer. After the ammonium ions are in contact with the air, they are easily converted into nitrate ions and absorbed by the leaves, and the leafy vegetables have a short growth period, which makes it easy to make nitric acid. Salt accumulates in the leaves, so avoid spraying nitrogen on the foliage of leafy vegetables.
The application of micro-fertilizers in vegetables can promote high-quality and high-yield vegetables, but the demand for trace elements in vegetables is extremely small. Excessive application of micro-fertilizer not only causes economic waste, but also is prone to poisoning and polluting the environment. Under normal circumstances, the amount of ferrous sulfate per acre should not exceed 3.25 kilograms, the monthly dosage of manganese sulfate and manganese chloride should not exceed 2.05 kilograms, the amount of copper sulfate should not exceed 2 kilograms per acre, and the amount of borax and boric acid per acre should not exceed 1.25 kilograms. .
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