Yellowing of winter wheat seedlings: classified control is key

When wheat seedlings turn yellow because the sowing soil moisture is poor, soil water is insufficient, emergence is uneven, and growth and development are poor, irrigation should be suited to the soil and applied rationally.

When seedlings turn yellow due to a lack of fertilizer nutrients, nitrogen, phosphorus, and potassium fertilizers must be applied promptly; apply 15 kg of urea per mu mixed with dilute manure water, and at the same time use 0.5 kg of monopotassium phosphate per mu, diluted with water and sprayed on the leaves 1 to 2 times, to prompt the wheat seedlings to regain color in time.

For wheat seedlings turning yellow due to heavy, compacted saline-alkali land, use 20 to 30 kg of superphosphate per mu, soak it in 40 kg of water for 5 hours, then dilute with another 60 kg of water, and take the clear liquid to drench the roots. Dilute manure water plus 2 kg of vinegar per mu can also be applied as a topdressing.

For yellow seedlings damaged by leaf rust and stripe rust, promptly use triadimefon diluted with water for spray control. For yellow seedlings caused by damage from red spiders and wheat aphids, a mixed liquid prepared from 40% omethoate emulsifiable concentrate plus aphid powder can be used for targeted spray control.

For waterlogged fields where the soil water content is too high, @#@245@#@ and yellow seedlings are caused by difficulty in root respiration, open ditches to drain water, carry out intertillage to loosen the soil, and combine this with broadcasting 60 kg of plant ash per mu to promote growth and development.

For yellow seedlings caused by soil that is too acidic and lacks trace elements, use 25 kg of quicklime per mu, diluted in 1200 kg of water to drench the roots; alternatively, use 20 g of ammonium molybdate diluted in 70 kg of water for leaf spraying.