Some wheat varieties will have such a situation after returning to green. The leaves of wheat will appear yellow and dead for no reason, so that the wheat growers will be wondering. How can they grow well and suddenly this happens? In fact, there are reasons for the yellowing of wheat. The specific reasons can be summarized as follows:
1. The excessive seeding density of wheat means that this will result in insufficient photosynthesis of wheat, resulting in insufficient nutrients for wheat absorption, resulting in yellowing of the leaves.
2, the second reason is the occurrence of freezing damage caused by the cold spring. When the wheat is frozen, it will show yellowing of the lower leaves, and the disease resistance of the wheat will also decrease.
3. The third reason is the lack of fertilizer and water, especially when the nitrogen fertilizer for wheat supply is insufficient, the wheat seedlings will appear thin and yellow, and the yellowing degree is uneven.
4. The fourth reason is that the yellowing of wheat leaves caused by herbicides may cause phytotoxicity when the application of herbicides is slightly inadvertent, and there is no way to save the dead wheat seedlings produced by herbicides.
Control measures for yellowing of wheat leaves:
1. Strengthen the management of fertilizer and water. If the bottom fertilizer is sufficient, the water has been poured after the Spring Festival, and the field is not too dry. It should be dominated by ploughing and ploughing to promote the growth of wheat seedlings. If the bottom fertilizer is insufficient, there will be no water after the Spring Festival, and the drought in the field is serious. The management of fertilizer and water should be strengthened in time. Before the watering, the fertilizer is applied, and the quick-acting fertilizers such as ammonium bicarbonate and ammonium sulfate are the main ones. The slow conversion of urea at low temperature is not suitable. Appropriate application of potassium fertilizer to promote the growth of wheat seedlings.
2, the use of wheat conditioner: Once the phenomenon of yellowing and dead seedlings of wheat leaves is found, use wheat conditioner once.
3. Control pests and diseases: pests such as wheat aphids and spider mites should be treated in time.
The above is the reason for the yellowing of wheat leaves and the prevention and control measures. If there is such a situation in the wheat planted by everyone, it is necessary to take timely measures to prevent it.
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Hangzhou DIAN Biotechnology Co., Ltd. , https://www.dianbiotech.com