Wheat deficiency disease control measures
â– Nitrogen deficiency
The main performance of the plant is poor growth, seedlings are thin and weak, and the tillers are small and weak. The leaves are small and erect, the leaves are yellowish green, the old leaves are dry, and gradually develop into the base leaves yellow, the number of roots is small and short, and the spikes are small and small. In advance, the output is low.
Nutritional regulation: nitrogen deficiency during seedling stage and return to green stage, 7-8 kg of urea can be topdressed per acre, or 20-25 kg of ammonium bicarbonate can be applied between rows or watering; 10-15 kg of urea can be topdressed at jointing stage . For wheat fields with light pale leaves and premature aging of nitrogen deficiency after heading, 0-30 kg of 1%-2% urea solution per acre can be used for foliar spray.
â– Phosphorus deficiency
The wheat seedlings grow slowly, the plants are short, the leaves appear dark green and dull. When the phosphorus is severely deficient, the leaves and sheaths are purple, the secondary roots are few and weak, the tillers are few, the rate of spike formation is low, the earing and flowering period are delayed, the grain weight is reduced, and the quality is poor. .
Nutritional regulation: Phosphorus deficiency at seedling stage, available 35-40 kg of superphosphate per acre, deep-sedimentation; phosphorus deficiency in middle and late stages, 200-250 g of potassium dihydrogen phosphate per acre, 50 kg of foliar per acre Spraying, spray once every 7-10 days, even spray 2-3 times.
â– Potassium deficiency
Generally in the growth of wheat, it is only shown in later stages. When the potassium is severely depleted, the tip and the leaf margin of the lower leaf of the young wheat will turn yellow first and then gradually turn brown. When the whole leaf is dry, the stem is small and delicate, and it is easy to fall down. Premature aging.
Nutrition regulation: 10 kg of potassium chloride or 50 kg of ash per acre is applied during the seedling stage; 50 kg of a 0.2%-0.3% potassium dihydrogen phosphate aqueous solution is sprayed in the middle and late stages of wheat growth, and sprayed once every 7-10 days. Spray 2-3 times.
Zinc deficiency
Inhibition of wheat growth, especially internode growth is severely impeded, showing signs of chlorosis or whitening between the veins of the leaves, generally chlorosis at the base of new leaf, leaf whitening, gradually turning yellow, and initial brown spots on the lower leaves , and then turned into a stripe. In the middle and late period, the zinc-deficient plants are short, empty and numerous grains, and the weight of 1000 grains is low.
Nutritional regulation: spraying with 0.2%-0.3% zinc sulfate solution, spraying 2-3 times.
â– calcium deficiency
Mainly in the new leaves of wheat, the upper leaves were significantly reduced, yellowing between veins, leaves near the growing point, leaf margin dead, often curved bent tip.
Remedy: Spray 0.3% calcium chloride solution or 1% calcium superphosphate leachate on the foliage, spray once every 7-10 days, spray 2-3 times.
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