At present, many plots of wheat have been produced, but some plots of wheat seedlings are found to be yellow, thin and weak. What causes it and how to prevent it.
Causes of yellowing of wheat seedlings
There are many reasons for the yellowing of wheat shoots, the most common are the following:
(1) Underground pest damage: underground pests such as grubs, golden needle insects, mole crickets, cutworms, etc. These underground pests mainly harm the rhizomes of wheat. If the control is not thorough, the wheat seedlings will be harmed before and after the wheat emergence, causing the wheat seedlings to turn yellow.
(2) Soil-borne diseases: There are many soil-borne diseases in wheat. The most common diseases in the seedling stage include total erosion, sheath blight, root rot and other underground diseases. These diseases mainly damage the rhizomes of seedlings and also easily cause wheat seedlings to grow. yellow.
(3) Sowing too deep: The suitable sowing depth for wheat is generally 3 to 4 cm. If the seedling is too deep, the seedlings will consume a lot of nutrients during the emergence of the seedlings. If they consume too much nutrients, they will not The method delivers sufficient nutrients to the stems and leaves for normal growth, and the abnormal nutrients can synthesize sufficient chlorophyll, resulting in malnutrition after emergence of wheat seedlings, thin leaves, and slender stems.
(4) Poor soil moisture: before sowing wheat, a large amount of straw is returned to the field, and a large amount of uncomposed straw remains in the soil, causing the root system to appear suspended during the growth process, unable to obtain sufficient water and nutrients, and also cause wheat seedlings yellow.
According to the on-site inspection, the main reason for the yellowing of wheat seedlings is that the seeding is too deep. The growth of seedlings is weak, and the photosynthesis of the stems and leaves are poor, causing the wheat seedlings just unearthed to turn yellow.
The harm of sowing too deep
If the seeds are sown too deeply, the wheat needs to consume a lot of its own nutrients before being unearthed, and the stems will grow longer, which will easily form mid-ground stems. The leaves and stems of the wheat seedlings are thin and weak, which will greatly affect the accumulation of nutrients in the wheat before winter, and even affect the wheat tillers. If there is less rain in winter and the soil is more arid, the wheat seedlings cannot absorb enough water, and the wheat seedlings are easy to absorb. Freezing damage occurred and dead seedlings appeared. The rate of seedling formation is greatly reduced, which ultimately leads to a reduction in production.
Prevention method
(1) Suppress after sowing: If the seeding is too deep, the wheat seedlings will turn yellow. Suppression can be carried out at this time. After suppression, the soil's water retention and fertility retention will be much better. The suppressed wheat seedlings will undergo secondary rooting at the tillering place, which can promote more tillering.
(2) Spraying foliar fertilizer: Before the winter, you can spray 30 kg of potassium dihydrogen phosphate + brassinolide with water evenly, which can quickly replenish foliar nutrition and improve the photosynthesis capacity of the leaves. This weak seedling can also Will slowly become strong seedlings.
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