Some fertilizers applied to vegetables can improve their quality and yield. However, some fertilizers can increase the yield after they are applied to vegetables, but they can cause pollution to vegetables and poison consumers.
Ammonium nitrate and other nitrate fertilizers are generally not suitable for use in vegetables. When nitrate nitrogen fertilizer is applied to the vegetable field, the nitrate content in the vegetables will increase exponentially. Nitrate is easily restored to nitrite in the human body. Nitrite is a highly toxic substance and has great damage to the human body.
Ammonium chloride, potassium chloride and other chlorinated fertilizers should not be applied to tomatoes and potatoes. After the chlorine-containing fertilizer is decomposed in the soil, the ammonium or potassium ions are absorbed by the soil or absorbed by the vegetables. When the concentration reaches a certain level, the root system of the vegetable will be poisonous, and the vegetables will be seriously dead.
Leaf vegetable vegetables avoid spraying foliar nitrogen fertilizer. When the vegetable leaves are sprayed with nitrogenous fertilizers, ammonium ions are easily absorbed into the leaves after they are contacted with air. In addition, the growing period of leafy vegetables is short, and it is easy to accumulate nitrates in the leaves. Therefore, avoid spraying nitrogen fertilizer on leaves of vegetable vegetables.
The use of micro-fertilizer in vegetables can increase the quality and yield of vegetables, but the demand for microelements in vegetables is very small. Excessive application of trace element fertilizer not only causes waste, but also produces poisoning to the crops and pollutes the environment. The amount of ferrous sulfate per mu cannot exceed 3.25 kg. The consumption of manganese sulfate and manganese chloride per month cannot exceed 2.05 kg. Copper sulfate cannot exceed 2 kg per mu. The amount of borax and boric acid per mu cannot exceed 1.25 kg.
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