One of the reasons is that the amount of watering is too large, and the low-lying topography results in salting, and the state of relative waterlogging is more than 5 days. Slow decomposition of organic matter, nutrients can not be absorbed in time, resulting in leaf yellow wheat seedlings, slow growth, root development is blocked, take root shallow, severe roots will also appear dead phenomenon.
Remedial measures: A small amount of water is poured on the low-lying land, and the easy removal of the wheat seedlings is required. For fields that have been over-watered, drainage should be carried out to deepen the dredging of the field drains.
The second reason is the lack of potassium yellow seedlings and the large amount of nitrogen applied. Different from the deficiency of nitrogen-deficient shoots, wheat seedlings often suffer from potassium deficiency and yellowing in the sandy soil, and the sorghum is heavier than the sorghum. The yellow-haired seedlings generally start from the tip of the leaf and then extend downward along the leaf edge. The boundary between the macula and the normal part is obvious, becoming mosaic yellow, yellow leaves tend to soften, and later attached to the ground.
Remedial measures: potassium deficiency wheat field can generally apply 5 to 10 kg of potassium per acre. Due to the previous application of nitrogen fertilizer, nitrogen or nitrogen and potassium fertilizers can no longer be topdressed, or combined with pest control, with 2% potassium dihydrogen phosphate for foliar spray.
The third reason: lack of magnesium or copper deficiency, magnesium deficiency in the lower position of the veins in the wheat chlorosis, residual green spots in a string. The copper-deficient wheat was yellowed, thinned, distorted and draped into the top yellowing disease. The old leaves were bent, the tip shrivelled into a spiral, and the lower part of the leaf sheath had gray spots.
Remedial measures: Reapplying nitrogenous fertilizers will cause the absorption of trace elements, and should reduce the amount of nitrogen fertilizers, and pay attention to the application of trace elements.
The fourth reason: wheat is infected with root rot. Wheat root rot is prone to occur during the growth period, and root rot during seedlings is accompanied by the appearance of leaf spots. Root rot in late wheat can cause premature aging of wheat, pods, ear rot, and rye germs, which can reduce yields in severe cases.
Remedial measures: Accumulation of a large number of pathogens in the soil of wheat continuous cropping fields, deep turning once in the next season. The higher the rate of seed colonization, the higher the incidence and disease index of seedlings. When sowing, it is treated with triadimefon or Likook Xiu, and the water is returned to the green period and the roots are fed with orrographin or amyrosulfuron.
The fifth reason: Wheat is infected with yellow dwarf disease. The new leaves begin to yellow from the tips of the leaves. The color of the leaves is golden yellow to bright yellow, and the yellow part accounts for 30% to 50% of the entire leaves.
Remedy: Wheat yellow dwarf disease has a high chance of occurring during the winter and cold winter seasons. It is mainly responsible for the prevention and treatment of wheat fork and earthworms, especially near the roadside and ditch-side wheat fields.
The sixth reason is that the weather is cold and cold, and there is no permeable water that causes freezing damage. Before the jointing of wheat, the low temperature of -5°C to -8°C is encountered. After the jointing, low temperature of around 0°C can easily cause frost damage.
Remedial measures: Watering of dry wheat fields in time before the cold current arrives to ensure adequate waterlogging and reduce freezing damage. After the cold fields that have not been irrigated, after the cold has flowed, they should be poured in a timely manner.
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