Nitrogen, phosphorus, and potassium are three kinds of nutrients that are necessary for the growth and development of wheat and require a large amount of nutrients. 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 to 8 kg of urea per acre, or 20 to 25 kg of ammonium bicarbonate, or 600 to 700 kg of human waste, in the inter-row furrow or watering; 2% urea later Solution foliar spray.
Phosphorus deficiency Phosphorus in wheat, the root development of wheat is poor, the secondary roots are weak and weak, and do not stretch, do not go down in the jointing stage and appear as "chicken claws"; the plants are thin, the delivery period is delayed, the number of tillers is reduced, and even the pods are not distributed. The leaf color is dark green and slightly purple; in particular, the tip and leaf sheath are purple, and gradually develop from the tip of the leaf to the base, from the old leaf to the young leaf; the cold resistance of the plant is decreased, and it is susceptible to freezing, heading and flowering. Delayed maturity and lack of grouting, and reduced grain weight.
Remedial measures: Phosphorus deficiency at the seedling stage, using 20-30 kg of superphosphate per mu, pouring or applying water between rows, or applying 150-200 g of monopotassium phosphate per acre, spraying 75 kg of water; In the later period, it is sprayed with 2% to 3% of superphosphate leaching solution or 0.2% to 0.3% of potassium dihydrogen phosphate solution.
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 per mu with 15 kg of potassium sulfate, or 100 kg of plant ash, followed by ditching between rows, followed by 1%-2% potassium sulfate solution or 0.2%-0.3% potassium dihydrogen phosphate solution Or 5% to 10% of the ash leaching liquid foliar spray.
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