Watered with fertilizer, returned to green wheat for sputum or yellow

Nowadays, the wheat is in the greening period, which is the best time to return the green water to return to the green fertilizer. However, some fields have temporarily returned to green after watering and fertilizing, and then continue to yellow. What is the reason for this? The following analysis of wheat yellowing caused by different reasons, hope to prescribe the right medicine.

One of the reasons: the amount of watering is too large, and the terrain is low, causing salt, and the relative waterlogging state is more than 5 days. The decomposition of organic matter is slow, and nutrients cannot be absorbed in time, resulting in yellowing of leaves, slow growth, blocked root development, and shallow rooting.

Remedial measures: Watering a small amount of low-lying fields, with the easy removal of the wheat seedlings, the drainage of the fields that have been over-watered should be ditched and deepened to clear the drainage ditch.

The second reason: lack of potassium yellow seedlings, and a large amount of nitrogen. Unlike the nitrogen-deficient seedlings, the lack of potassium and yellowing of wheat seedlings often occurs in sandy soil fields, and the edge of the wheat is heavier than the sorghum. The yellowing wheat seedlings generally start from the tip of the leaf and then extend down the edge of the leaf. The boundary between the macula and the normal part is obvious, and it becomes inlaid yellowing. The yellow leaves tend to soften and stick to the ground later.

Remedial measures: Potassium-deficient wheat fields can be applied with 5 to 10 kg of potash per acre. Because of the previous application of nitrogen fertilizer, nitrogen or nitrogen and potassium fertilizers can no longer be applied, or combined with pest control, foliar application with 2% potassium dihydrogen phosphate.

The third reason: lack of magnesium or copper deficiency, the lower leaves of the magnesium-deficient wheat are chlorotic, and the residual green spots are in a string. The copper-deficient wheat leaves are yellowed, thinned, and twisted into apical yellowing disease. The old leaves are bent, the tip of the leaves is swollen into a spiral, and the lower part of the leaf sheath has gray spots.

Remedial measures: Re-application of nitrogen fertilizer will cause absorption of trace elements, reduce the amount of nitrogen fertilizer, 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 at the seedling stage is accompanied by leaf spots. Root rot in the late stage of wheat can cause premature senescence of wheat, excessive mites, ear rot, and rye embryos, which will reduce production in severe cases.

Remedy: A large number of pathogens accumulate in the soil of wheat continuous cropping field and will be turned over once in the next season. The higher the seed carrier rate, the higher the seedling incidence and disease index. When planting, use triazolone or Likexiu coating to treat it. In the greening stage, combine with watering, and use root mold or nail cream to irrigate the roots.

The fifth reason: wheat infection with yellow dwarf disease. The new leaves begin to yellow from the tip of the leaves, the leaves are golden yellow to bright yellow, and the yellowed parts account for 30% to 50% of the whole leaves.

Remedial measures: The incidence of wheat yellow dwarf disease is high in the warm winter and cold season, mainly to control the wheat fork and planthopper, especially near the roadside and ditch.

The sixth reason: encounter cold spring, no watering caused by low temperature freezing damage. Wheat encounters a low temperature of -5 °C ~ -8 °C before jointing, and a low temperature of about 0 °C after jointing is likely to cause freezing damage.

Remedial measures: Water the dry wheat fields in time before the cold current arrives to ensure sufficient moisture to reduce the cold damage. After the cold flow of the damaged field without watering, it should be poured again in time, and it should be poured thoroughly.

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