1. Insect-infested yellow seedlings: The yellow leaves caused by wheat stalks and wheat spiders sucking leaf juice mainly occur around the wintering period. Can use 5% imidacloprid high-chlorine EC 50-75 ml water 30 kg spray control.
Second, disease-induced yellow seedlings: wheat sheath blight damage roots and stems, hinder the transport of nutrients and moisture caused by the yellow wheat leaves. Each can use 12.5% ​​wolfberry fruit 20 grams or 70% thiophanate methyl 100 grams of water 30 kilograms of stem spray control.
Third, the lack of fertilizer to trigger yellow seedlings: nitrogen deficiency from the tip of the leaf gradually expand the whole leaf, small and weak sputum, phosphorus deficiency when the seedlings yellow, slow growth, potassium deficiency when the seedlings are small yellow, slow growth. Remedial measures are for nitrogen deficiency should be returned to green in the three-leaf period or when the second year, each topdressing urea 10 kg, for phosphorus deficiency is superphosphate 30 kg, deep ditching; lack of potassium or trace elements It also needs to make up for it in time. Each mus of 1 kg of urea and 100 grams of eucalyptus and 30 kg of water on the foliar spray can prompt the leaf color to turn green quickly.
Fourth, yellow fertilizer caused by fertilizer damage: due to blind overuse of chemical fertilizers, pesticides, causing wheat leaves and tips yellow. The remedial measures are to water in time, dilute the medicinal fertilizer solution, and slow down the fat and chemical injury.
5. Inadvertent yellow seedlings caused by returning straw to the field: Due to the uneven return of straw, the ploughing is not serious, resulting in the piles of straw buried in the soil, making the soil empty. When the wheat seedlings are rooted, they are not well rooted, so they grow slowly. Leaves yellow. It is necessary to promptly repress, water, and practise the soil and topdressing suitable nitrogen fertilizers such as ammonium bicarbonate.
Sixth, the density is too large to cause yellow seedlings: uneven sowing or excessive sowing, so that the wheat field population density will lead to yellow wheat. The remedial measures are repression in a timely manner, suitable fertilizer and chemical control measures.
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