Nitrogen deficiency symptoms and correction techniques. In the absence of nitrogen in wheat, the plants are slender, upright, and leaves are sparse, yellow until dry or dead. Purple green stems, few tillers, small ears, small grains. Wheat nitrogen deficiency can be topdressed with urea. In the returning green period, 10 kg of seedlings can be collected. After top-dressing and booting, attention should be paid to timely and appropriate top-dressing attack. Or timely spraying 2% urea solution twice, each time interval of 7 days, and immediately followed by 20 kg of ammonium bicarbonate or urea 7 kg to 8 kg per acre.
Phosphorus deficiency symptoms and correction techniques. In the absence of phosphorus in wheat, the leaves are green and purplish, and they grow slowly, with very few tillers. Stem dwarfs are slender, heading and maturity are delayed, and spikelets are small. After the symptoms of phosphorus deficiency were found in wheat, 200 grams of potassium dihydrogen phosphate could be used to spray 30 kilograms of water on leaves.
K deficiency symptoms and correction techniques. When wheat lacks potassium, the leaves are blue-green, and the leaves are soft and curly. The tips and edges of the old leaves turn yellow so that they are dry and burnt. The stalks are weak, dwarf, short in internodes, less in spikes, and easy to lodging. After the wheat has been found to have potassium deficiency symptoms, it usually applies 10 kg of potassium sulphate as a base fertilizer or a combination of top dressing at the seedling stage or foliar spraying with 1% potassium chloride aqueous solution or 0.2% potassium dihydrogen phosphate aqueous solution, or in the rhizosphere Apply potassium sulfate 5-7 kg per mu.
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