Corn is one of the main economic crops in China, and the distribution of corn in China is particularly wide. How to make corn high-yield and harvest is a common concern of many farmers. Many farmers think that fertilizing corn will produce high yield and good harvest, but too much Fertilizing corn can also cause a lot of damage to corn. Corn fertilizer is caused by excessive or improper application of chemical fertilizers. Physiological or morphological abnormalities of corn plants can inhibit seed germination or seedling death. Residual seedlings are dwarfed, and seedling leaves turn yellow until they die. The following factors will promote corn. Fat damage occurred.
1 biuret exceeded
In the process of melting, if urea is treated at high temperature (133 ° C under normal pressure), biuret will be produced. When the biuret content exceeds 2%, it will have toxic effects on crop seeds and seedlings. In recent years, with the change of the production process of compound fertilizer, “biuret†is easy to produce in the granulation process such as high tower melting spray, oil cooling and drum spray, but the national standard of compound fertilizer It is not required to detect "biuret" and make the surface "qualified" compound fertilizer into the market, posing a potential threat to corn production.
2 fertilizer formula is not reasonable
In the traditional compound fertilizer formula, the nitrogen content generally does not exceed 15%, and some of the compound fertilizers currently have a nitrogen content of more than 20%. When the nitrogen content is increased, the corresponding fertilization method should be changed accordingly (for example, the amount of fertilization is correspondingly reduced or the fertilization point is farther away from the root of the crop, etc.), otherwise the salt concentration is too high and the rooting and rotting roots are caused.
3 unfertilized organic fertilizer directly to the ground
Once the organic fertilizer that is not decomposed or incompletely matured is applied to the soil, it will produce a large amount of organic acids and heat during the decomposition process, which may easily cause root burning.
4 corn seedlings have more precipitation
The soil has a good water content and the fertilizer melts quickly. The rotary tillage for many years makes the bottom layer hard and shallow, and the root growth is limited. The local soil solution is always in a high concentration state, resulting in insufficient water supply, slow growth of the seedlings, and serious in vivo. Backflow, the plant loses water and gradually dies. On the other hand, due to the hard bottom of the soil plow, the chemical fertilizer melts down slowly and spreads horizontally on the plow bottom layer, so that the roots are exposed to high-concentration fertilizer solution, and it is easy to burn.
Fertilizer treatment measures
1 irrigation water field
In most cases, watering the fields can quickly reduce the damage.
2 A large number of elements caused by excess fertilizer
Excessive nitrogen can be applied by spraying appropriate amount of plant growth regulators (such as ketamine, paclobutrazol, etc.); if phosphorus is excessive, nitrogen, potassium, zinc and other micro-fertilizers can be added to adjust the reasonable ratio between elements.
3 biuret exceeded the standard caused by fat
It can be mixed with micro-fertilizers such as boron, molybdenum and magnesium, and foliar fertilizers such as potassium dihydrogen phosphate or ammonium phosphate which are sprayed at a lower concentration. At the same time, watering and rinsing can also reduce the concentration in the soil, thereby reducing The extent of the damage. (Source: Agricultural Technology)
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