Appropriate amount of fertilizer should be avoided to cause fertilizer damage

How can it be harmed?

To answer this question, you must first understand how the crops absorb water.

The crop is a protruding part of the root hair epidermal cells that absorbs water through osmosis. An infiltration system is formed between the root hair cell solution of the crop and the soil solution around the root. Under normal conditions, the concentration of root hair cells is greater than that of the soil solution, and the water will permeate from the soil through the root cell protoplasm to the cytosol, so that the crop forms normal physiological absorption and metabolism. Conversely, if the concentration of soil solution is higher than the concentration of the cell fluid, the water inside the cell will diffuse out of the cell to form a reverse osmosis effect, which will cause the dehydration of the cell protoplasm and the cell wall to separate, causing the cells to dry up and stopping their life activities, leading to the death of the plants.

If the fertilization concentration is too high, especially when the concentration of fertilizers is too high in dry weather, the concentration of soil solution is likely to be greater than the concentration of the root cell fluid, causing the cells to lose water and causing cytoplasm and wall separation, so that the stems and leaves wither, especially at the seedling stage of the crop. The concentration of cell fluid is even lower. When the concentration of fertilizer is too large, it is more likely to produce fertilizer.

Therefore, fertilization should pay attention to see the sky, see seedlings, see the rational use of fertilizer, adhere to the principle should be light should not be concentrated, to prevent crops produce fertilizer damage.

What is the performance of fertilizer?

Water-based fertilizer damage due to excessive application of fertilizer, or application of excessive concentration, or lack of soil moisture, fertilization after fertilization, soil nutrient concentration, resulting in reverse osmosis of water within the crop cells, resulting in dehydration of crops, often make crops appear wilt, like The same as frosted or boiled water, the light affects the normal growth and development of the crop, causing death in severe cases. Such as paddy rice seedlings nursery, rice seedlings two leaves when the heart, about 2 kg of urea per square meter, there will be reverse osmosis and burning root, and then cause the plants yellow, if not take timely remedial measures, it will cause dead seedlings.

Fertilizers with burn-related fertilizers, such as ammonium bicarbonate applied at relatively high temperatures, are prone to produce large amounts of ammonia. Burned crop leaves, lighter crops have yellow tips on the lower part of the crop, and heavy plants all have yellow and wilted leaves. As mentioned above, when applying urea or other fast-acting fertilizers on dry nursery beds, the agricultural film is covered with dewdrops on the membranes. Because of the large concentration of fertilizers, they drip on the leaves of rice seedlings, and a small drop of water forms a burn-like leaf. spot.

Poisonous fertilizers Some fertilizers, such as lime nitrogen, are converted in the soil if applied directly. During the decomposition process, a toxic substance is produced that poisons the roots of the crop. Another example is the application of excessive ammonium sulfate in rice fields, rice roots will become black due to hydrogen sulfide poisoning, causing crop damage and even death.

Other fertilizer damage phenomena use urea as a seed fertilizer or seed dressing, because urea is a high-concentration fertilizer, but also contains a certain amount of biuret. After contact with seeds, it will affect its germination, and even cause it to lose its germination power. Another example is superphosphate seed dressing, if too much, it will also affect the seed germination. According to the test, soybean seeds soaked with 1% boron fertilizer were sown after 4 hours and they did not germinate at all. Excessive chlorination can harm chlorine-sensitive crops.

In order to prevent the occurrence of fertilizer damage, chemical fertilizers should be applied scientifically, and it is best to deepen them; urea should not be used as a seed fertilizer; the amount of superphosphate seed dressing should not be excessive; the topdressing of chemical fertilizers should not be excessive, and it is better to apply water or soil to the soil. Ammonium bicarbonate should not be applied at high temperatures; lime nitrogen can not be applied directly, mixed with fine soil or farmyard manure, the accumulation of tanning, until after the disappearance of toxins.

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