Nitrogen and potassium are two kinds of nutrients necessary for the growth and development of wheat, but also require a large amount; once a certain element is lacking, it will show the corresponding deficiency symptoms through the external shape of the plant. Production is often used as a diagnostic defect. And the basis for taking remedial measures.
Nitrogen deficiency When wheat is deficient in nitrogen, the plant growth is poor, the seedlings are thin and upright, the tillers are small, the leaves are narrow and short, and the base leaves start from the tip of the leaf and gradually turn yellow and dry, and gradually develop upward.
Remedial measures: nitrogen deficiency at seedling stage, 7-8 kg of urea per acre, or 20-25 kg of ammonium bicarbonate, or 600-700 kg of human waste, in the inter-row ditch or pouring water; late use of 2% urea Solution foliar spray.
Potassium deficient disease When potassium is deficient in potassium, the plants grow slowly, the roots develop poorly, and they are perishable. The stems are short and the leaves are dark green or blue-green. The leaves are covered with soft undergrowth. The tips and edges of the plants are brown, and then brown and scorch, but the veins remain. It is green, and when it is severe, the entire leaf withers, the plants are wilting, easy lodging, premature aging, and the spikes are small and light, and the quality is deteriorated.
Remedial measures: Potassium deficiency at seedling stage, 15 kg of potassium sulfate per mu, or 100 kg of vegetation ash, topdressing between rows, followed by 1%-2% potassium sulfate solution or 0.2%-0.3% potassium dihydrogen phosphate solution Or 5% -10% of ash leaching liquid foliar spray.
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