How is corn seedling yellowing? How to prevent corn yellow leaves, corn is a zinc-sensitive crop, white zinc seedlings appear in zinc deficiency, and it looks like corn seedling yellow. Generally, zinc fertilizer is better for base application; if zinc deficiency is found during the growth period, it will appear to be long and the leaves are small. If the seeding is too shallow, it will not be easy to emerge. If it is too deep, the seedlings will be weak and the seedlings will be yellow. The sowing depth should be controlled at 3-5 cm. When planting, a certain amount of fertilizer will be applied to promote the growth of seedlings, such as per acre when planting. 3 kg of diammonium phosphate can effectively prevent yellowing of corn seedlings.
Recently, Pingle Village, a farmer's technology demonstration model phone, reflects that his family's corn seedlings are yellow and not long, I don't know why. After receiving the call, the agricultural technology station arranged the technicians to contact the masses to check the cornfields. The corn fields reflected by the masses, the upper sorghum wheat were irrigated with the Zhongzhou canal water. After the corn was planted, the water was not poured. Five leaves, but the stems and leaves are purple, and the heart leaves are yellow, which is obviously shorter than other corn in the surrounding fields;
Looking at the land knot, the wheel rolling marks are obvious. Some corn seeds remain on the surface and grow corn short; some corn in the field has no seedlings, and it can hardly pull out, only the corn stems are pulled out, and the corn roots cannot be pulled out.
In summary, the reason is that there is no cultivating in flood irrigation in spring, when the wheat is harvested, the land is relatively wet, mechanically rolled, and mechanical milling is carried out when the corn is planted, resulting in serious soil compaction in the corn field, poor soil permeability and permeability, resulting in growth of the root growth of the corn seedling. The seedlings are yellow, the stems and leaves are purple, and the plants are short.
Remedy: First cultivating the loose soil, breaking the soil compaction, so that the roots can breathe normally and promote root growth. Second, pick up the seedling fertilizer, combined with cultivating, apply 20 kg of compound fertilizer per acre. Trifoliate spray fertilizer, sprayed with 0.2% potassium dihydrogen phosphate solution, sprayed 23 times, each time 7 days apart.
What other factors will cause the yellow pages of corn seedlings?
Inter-miao, fixed seedlings are not timely
After the emergence of corn, the seedlings should be planted in 3-4 leaves of corn, and the seedlings should be fixed at 6-7 leaves to avoid crowding of seedlings, competing for each other, fighting for water and glory, forming weak seedlings, diseased seedlings and yellow seedlings; The number should be flexibly controlled according to the variety, and the seedlings should be fixed according to the density required by the cultivar.
Insufficient watering
Before the planting of corn or after sowing, the water is not enough, and the seed does not get enough water, which affects the normal germination and emergence. The unearthed time is too long, resulting in weak seedlings and yellowing at the seedling stage.
Disease
If the seedling period encounters long-term low temperature and rainy weather, it will cause the occurrence and prevalence of corn seedling blight. The seedling blight began to develop in the second and third leaves. The leaves of the seedlings were yellow and dry, and the edges were scorched. The leaves gradually turned yellow and dry from bottom to top; the root hairs were less, and the roots became brown and poorly developed, resulting in weak seedlings.
Waterlogged seedling
The water-stained seedlings are often in the rainy season, and the low-lying land is poorly drained or the water is accumulated in the rolling water when the wheat is harvested, resulting in yellowing.
Herbicide hazard
Inappropriate use of herbicides A small number of farmers arbitrarily increase the amount of herbicides; blindly mixed with other pesticides; the concentration of the drug is too high; sprayer interoperability; the impact of counterfeit and herbicides on the post-production will cause corn yellow seedlings.
Pest
The main insect pests of maize seedlings are cotton bollworm, golden worm, aphid, armyworm, thrips, swiss squid, ground tiger, stalked stalk, etc. The nymphs and female adults are concentrated in the base of the near-stem of corn seedlings. In the roots and sheaths, the juice is absorbed, causing the damaged corn leaf sheath to first turn yellow and dry.
This article URL: How is corn seedling yellowing how to prevent corn yellow leaves [Figure]
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