At present, some wheat varieties have been found to have yellowed leaves and dead seedlings after returning green. The following reasons may cause the yellowing of wheat leaves and its treatment measures are recommended as follows:
First of all, last year's wheat planting time in our province was late, and the wheat was generally more seeded. As a result, the density of some wheat was too large, which directly affected the photosynthesis of wheat, and the supply of nutrients was insufficient. Especially the lack of nutrition such as sugar in leaves exposed to space led to The yellow leaves appeared; after the wheat was frozen, the lower leaves appeared yellow. The third is the yellowing of leaves caused by insufficient fertilizer. The fourth is drug poisoning. The main cause of poisoning in wheat seedlings is herbicides. Based on the above situation, the following management measures are proposed:
The first is to strengthen fertilizer and water management according to the situation. If the base fertilizer is adequate, water has been poured after the year. The fields are not very dry and should be dominated by ploughing, which promotes the growth of wheat seedlings. If the base fertilizer is insufficient, there will be no watering after the year and severe drought in the field. The management of fertilizer and water shall be strengthened in a timely manner. Fertilizer is applied before watering, and quick-acting fertilizers such as ammonium bicarbonate and ammonium sulfate are mainly used, and urea is not suitable for slow conversion at low temperatures. Appropriate fertilizer potassium fertilizer to promote the growth of wheat seedlings.
The second is to use a wheat-specific regulator, McGiurgi, before the wheat returning season, wheat jointing. Maijujin has the effect of promoting the rooting and strengthening of wheat, shortening the internodes, enhancing disease resistance and preventing lodging, etc. It is only needed once in wheat for life, which is simple and convenient, and can achieve a multiplier effect;
The third is to pay attention to pest control.
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