Causes and Control Measures of Abnormal Leaf Color in Wheat Seedlings

@#@245@#@After sowing and emergence, various abnormal discolored seedlings often form due to the influence of natural conditions and cultivation practices. To facilitate management according to seedling condition and targeted treatment, they are described separately below. Causes of yellowing of leaves in yellow-leaf seedlings.

First, soil drought. This situation mostly occurs in wheat fields with insufficient subsoil moisture or where moisture escapes through airy soil. Its characteristics are: slow tiller emergence, grayish-green leaf color, short and small central leaves, slow or stagnant growth (which farmers call "shriveled-heart seedlings"), gradual yellowing and withering of the middle and lower leaves, and few and fine roots. Key management points: combined with irrigation, apply 15 kg of ammonium bicarbonate per mu as a topdressing.

Second, nitrogen deficiency. The seedlings are thin and weak, standing upright, with reduced tillering and narrow, short leaves. The lower leaves begin yellowing and withering from the leaf tips and gradually spread to the upper leaves. Key management points: use 7-8 kg of urea per mu, or 20-25 kg of ammonium bicarbonate, or 600-700 kg of human feces and urine, applied in furrows between rows or watered on after dilution.

Third, hardened soil. Because the soil lacks moisture and air, root extension is difficult, causing wheat leaves to be yellow and short, and tillers cannot appear on time. Key management points: first irrigate in time, then carry out deep intertillage and loosening of the soil to break up the hardened layer.