When normal wheat seedlings grow to 3-5 leaves, yellow seedlings often appear in different degrees in winter. According to the field survey, the main factors leading to wheat yellowing are caused by the incompatibility of water, fertilizer, acid and alkali, and the effects of diseases, and should be controlled.
1. For waterlogged soils with high soil moisture content, yellow seedlings caused by dyspnea in wheat roots, drainage in rational trenches, loose soil in cultivator, combined with 60 kilograms of plant ash per acre to promote growth and development.
2. Due to poor sowing of seeds, lack of soil moisture, emergence of seedlings, poor growth and development led to yellow wheat seedlings, mainly due to local conditions. Reasonably irrigated.
3. Due to the lack of nutrients in fertilizers that cause yellow seedlings, NPK fertilizers must be applied in a timely manner. 15 kg of urea per mu should be applied to dilute waste water, and 0.5 kg of potassium dihydrogen phosphate per acre should be used. 2 times, prompting the wheat seed to change color in time.
4. For the yellow seedlings caused by the acidity and lack of trace elements in the soil, 25 kg of lime are used per acre, and 1200 kg of water is irrigated. It is also possible to use 20 kg of ammonium nitrite to spray 70 kg of foliar spray.
5. Salt-to-ground yellow seedlings for viscous heavy-duty, superphosphate 20 to 30 kg per mu, soaking 40 kg of water for 5 hours, diluting with 60 kg of water, and taking clear liquid to root. You can also use diluted manure water and vinegar 2 kg per mu.
6. For yellow seedlings that are damaged by leaf rust and stripe rust, triadimefon should be used to prevent and control water spray and yellow seedlings should be controlled.
7. Yellow seedlings caused by damage to red spider mites and wheat aphids can be formulated with 40% omethoate EC plus ash powder to achieve targeted spray control. The control effect is better.
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