Give nitrogen, phosphorus, potassium and zinc to wheat

The nitrogen deficiency of nitrogen supplemented wheat showed that the plants were short and thin, with slow growth, narrow leaves, and light green leaves. In severe cases, the leaves turned yellow from the base upwards, the tip was dry and dead, there were few tillers, the number of secondary roots was small, and the stems were weak. Corrective techniques: Nitrogen deficiency at the seedling stage, can be applied to urea; return to the green period of nitrogen deficiency, can be applied 5 kg of urea per acre, and then apply 10-15 kilograms at the jointing stage. Phosphorus and phosphorus deficiency performance: wheat seedlings grow slowly, leaf color appears dark green, dull, new leaves blue-green, purple tips, stalks are weak, fewer tillers, poor root development, heading Yanghua delayed. The empty rate of wheat increased and the grain weight decreased. Corrective techniques: Phosphorus deficiency at seedling stage, 35-40 kg of superphosphate per acre; phosphorus deficiency at middle and later stages, 1.5-2 kg of superphosphate per acre in the earliest stages of booting and flowering, or 200 mg of potassium dihydrogen phosphate per acre. - 250 grams of water and 50 kg of foliar spray. The application method is 7-10 days interval, spray 2-3 times. Potassium deficiency potassium performance: wheat seedlings in the lower leaves of the old leaf tip, leaf edge first yellow, and then gradually become brown, leaf edge is still green, far like a fire-like, when the whole dry leaves, small stalks, easy to lodging . Corrective technique: Apply 10 kg of potassium chloride or 50 kg of plant ash per acre during the seedling stage, and also spray 50 kg of a 0.2%-0.3% aqueous solution of potassium dihydrogen phosphate in the middle and late stages of wheat growth. The interval between each application is 7-10 days, even spray 2 or 3 times. Zinc deficiency zinc performance: wheat seedling leaves chlorosis, heart whitening, mid and late plant dwarf, small and brittle leaves, roots become black, more empty grains, low grain weight. Corrective technique: In the seedling stage and jointing stage, 150-200 g of zinc sulfate is used to spray 50 kg of foliar water.

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