Reasons for weak seedlings of yellow seedlings The return of wheat straw directly to the field after corn is harvested is consistent with the law of circular agriculture and can also increase the sustainable production capacity of the land. However, if the whole operation technique of returning corn from corn-wheat sowing cannot be put into place according to the standardization requirements, various problems may arise. First of all, it will hinder the emergence of seedlings and seedlings of the main wheat; if farmland soil conservation measures cannot keep up It will also accelerate the loss of “green water†in the cultivated soil, which in turn will be detrimental to the high yield of winter wheat. It can be said that the emergence of this part of the wheat field and the problem of seedling yellowing are due to the nonstandard operation of returning straw to the field and the poor quality of the wheat.
Remedial measures After the rain and snow, we must seize the measures to protect the wheat fields so as to prevent the wheat fields from running. If we keep and keep the "green water" within two meters of deep soil, we will lay the foundation for the spring drought. The principle of dry repression and dampness can be used for the protection. The dry land in high places should be filled with frozen water, and the low-lying wheat fields should be soiled after rain and snow.
Wheat seedlings will advance into a hibernating state when they are weak and have few tillers. If the winter wheat seedlings are covered with rain and snow, they will not be subjected to freezing and drought, and the wheat seedlings will be subjected to a suitable low temperature (referred to as 1°C to 5°C). Sexual exercise helps increase the resistance of weak wheat seedlings to strong seedlings.
After the straw is ploughed, the base fertilizer is still applied to the wheat field in constant amount, and it is necessary to supplement additional accelerated nitrogen fertilizer. Before thawing or early next spring, apply urea, ammonium sulfate, ammonium bicarbonate or ammonium chloride to the soil.
In the coming year, in order to avoid problems such as poor seedling emergence and yellowing of wheat seedlings caused by the return of straw to the field in the coming year, the following recommendations are made for direct returning of straw to the field:
First, the amount of returned straw should be moderate. Calculated from air-dried straw, it should not exceed 1000 kg/mu per mu. Excessive stalks will affect the quality of the sowing. When straw is returned to the field in paddy fields, the organic acids produced during the decomposition of the straw must be prevented from poisoning the root system.
Second, the straw should be chopped with machinery of sufficient horsepower, the length should not exceed 10 cm, and the depth of ploughing should be less than 15 cm. The cover should be covered tightly to prevent the straw from decomposing, without affecting the seedling emergence.
Third, the direct return of straw to the field requires the addition of accelerated nitrogen fertilizer. When grasses such as wheat, corn, and rice are returned directly to the field, the air-dried straw should be added with 3~5 kilograms of pure nitrogen per 100 kilograms of straw to adjust the C/N ratio so as to absorb the soil during microbial decomposition of the straw. Available nitrogen. If no additional nitrogen fertilizers are applied, microorganisms will use the nitrogen applied to the seedlings to cause nitrogen deficiency in the seedlings and yellow seedlings, which will affect the normal growth of the seedlings.
Fourth, turn over time and moisture management. Can be harvested while reaping while harvesting, using more moisture when harvesting, and timely burial is conducive to decomposition. Soil moisture status is an important factor in determining the speed of decomposition of wheat straw. In terms of water management, if soil moisture is poor, irrigation should be performed immediately after ploughing. However, if moisture is good, it should be suppressed and the soil compacted to facilitate decomposition of straw.
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