Wheat is deficient in nitrogen, plants are slender, erect, leaves are sparse, yellowish until dry or dead. The stem is purple-green, with few tillers, small ears and few grains. It can be applied with urea, and 10 kg of seedling fertilizer should be applied during the regreening period. After the top dressing stage, the appropriate amount of the attacking fertilizer should be applied, or the 2% urea solution should be sprayed twice in time, at intervals of 7 days. Then apply 20 kg of ammonium bicarbonate or urea 7-8 kg per acre.
Wheat is deficient in phosphorus, leaves are green, and are slightly purple, with slow growth and few tillers. The stems are short and slender, with delayed heading and maturity, and fewer spikes and small grains. It can be used for foliar application of 30 kg of water with 200 g of potassium dihydrogen phosphate.
The wheat is deficient in potassium, the leaves are blue-green, the leaves are weak, curled, and the tip and edge of the old leaves turn yellow or even dry, like a scorched look. The stems are weak, short, short between nodes, with few spikes and easy to fall. Must be timely, fertilization and remedy, can apply 10 kg of potassium sulphate as the base fertilizer, or seedling stage combined with top dressing or foliar spray 1% potassium chloride aqueous solution or 0.2% potassium dihydrogen phosphate aqueous solution, or in the rhizosphere strip Apply potassium sulphate 5 to 7 kg per mu.
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