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1. Avoid applying nitrate nitrogen fertilizer. The application of nitrate-nitrogen fertilizer to vegetables will increase the nitrate content of vegetables by a multiple. Vegetables with high nitrate content are easily degenerated by human hemoglobin after being eaten by humans, and the brain, heart and other organs are deprived of oxygen. Therefore, in the cultivation of vegetables, it is not allowed to apply nitrate nitrogen fertilizer, and ammonium nitrogen fertilizer can be selected.
2. Avoid applying chlorine fertilizer. Chlorine-containing fertilizers are applied to vegetable fields. When ammonium or potassium ions are absorbed by soil or absorbed by crops, chloride ions remain in the soil. When the concentration reaches a certain level, it will poison the crop roots, reduce the starch and sugar content of the vegetables, and even lead to plant death.
3. Avoid applying fresh manure. Fresh manure and urine that have not been piled up and rotted contain ascaris eggs. Ascaris eggs have strong living ability in the outside world and generally survive for 3 to 6 months. When people eat vegetables contaminated with mites, they become infected with tsutsugamushi. Therefore, human excrement must be suffocated by high temperature before application, so that it is fully decomposed.
4. Avoid drought fertilization. Vegetables are hi-water crops. When the soil is dry, fertilization can not only fully exert the fertilizer effect, but also cause the rooting phenomenon when the concentration of the soil solution suddenly rises.
Among the many vegetable topdressing techniques, foliar topdressing is a kind of cultivation technology that is economical, quick-acting, high-yield and improved in vegetable production. It can promote the growth of vegetables, prevent premature aging and prolong the growth period.
In the production, we should choose the right fertilizer according to the different growth period of different kinds of vegetables. Fruits, melons, and legumes should be applied with phosphate, potassium, zinc, and molybdenum fertilizers during the development of the seedlings. In the expansion period of potato vegetables, the fertilizers rich in phosphorus and potassium should be sprayed on the leaves; the leafy vegetables should be applied with fertilizers with high nitrogen content in the appropriate amount of leaves at the appropriate time.
In terms of concentration and use. The concentration of the sprayed fertilizer solution should be light in the early stage, and should be concentrated in the middle and late stages; the amount of the acre used is less in the early stage and more in the middle and late stages.
At the same time, foliar spray fertilizer should be carried out on a windless sunny day.
Vegetable fertilization taboos and points
To ensure the safety of vegetable production, there must be a "four bogey" concept in the process of fertilization.
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