During the growth and development of wheat, various nutrients are needed. If malnutrition, lack of a certain kind of nutrients, wheat seedlings will show symptoms from the external form. Therefore, in the production can be based on the symptoms of wheat seedlings to determine the type of elements needed to achieve the right medicine, timely supplement fertilizer material to ensure seedling growth and robust.

A. Nitrogen deficiency The plants are short, the leaves are light green, and the tips of the leaves turn yellow from bottom to top, with fewer tillers and stalks. Remedial measures: In the return period of 667 square meters, 5-8 kg of urea is topdressed, and then 10-15 kg of urea is applied at the jointing stage.

2. Phosphorus deficiency plants are small, with less secondary roots, fewer tillers, dark green leaves, purple tips, and purple stems, which can lead to fewer spikelets, less grain, and lower kernel weight. Remedy: Top-up superphosphate, use 20-25kg of superphosphate per 667m2 with water. At the same time, foliar spray 5% superphosphate solution, or 0.2% potassium dihydrogen phosphate solution, spray once every 7-10 days, even spray 2-3 times.

3. Potassium Deficiency Disease The deficiency of potassium in wheat begins with yellowing from the tip and the leaf margin of the lower old leaves, and the leaves are soft, curly, and then gradually brown. The veins are green, the stalks are fine and weak, the tillers are irregular, and the spikes are less, causing the grains to be not uniform and easy to lodging. Remedial measures: 667 square meters of potassium sulfate or potassium chloride 10 kg, and the application of plant ash, 667 square meters Shi 100 kg, should also be spraying 0.2% of potassium dihydrogen phosphate solution, once every 7-10 days, Even spray 2-3 times.

Four, zinc deficiency wheat seedlings deficiencies in leaf chlorosis, leaf bleaching, internode shortening, plant dwarf, premature crushing shrinkage of the middle leaf margin, roots become dark, more empty grains, 1000 grain weight reduction. Remedial measures: Spray 0.3% zinc sulfate solution every 667 m 2 of the jointing stage, spray once every 5-7 days, and spray 2-3 times.

Five, boron deficiency disease Wheat delivery is not normal, leaf sheath is purple brown, sometimes no heading, or only flowering is not strong. Remedy: Spray 0.2% borax solution on the foliage, spray once every 7-10 days, and spray 2-3 times.

Sixth, iron deficiency disease Wheat iron deficiency occurs mainly in the new leaves, yellow leaf tissue, the upper leaves can become yellow-white. Tips and margins will gradually wither and expand inwards. Remedy: Foliar spray 0.2% ferrous sulfate solution, once every 7-10 days, even spray 2-3 times.

7. Molybdenum-deficitosis Wheat lacks molybdenum when it first appears in the front part of leaves, leaves turn brown, and then in the lower part of the heart leaves full-spread leaves, along the veins parallel small yellow and white spots, and gradually connected into a linear, flaky, and finally Leaves the front of the leaves dry and the entire whole leaves dry. Remedy: Spray 0.5% ammonium molybdate solution on the foliage, spray once every 7-10 days, and spray 2-3 times.

VIII. Manganese-deficiency disease When wheat is deficient in manganese, the symptoms are similar to that of molybdenum, but the lesions occur in the middle and posterior parts of the leaves. After the diseased leaves are dry, they curl, and the anterior part of the leaves gradually dry up. Remedy: Spray 0.2% manganese sulfate solution on the leaves, spray once every 5-7 days, and spray 2-3 times.

9. The leaf margins of the middle and lower leaves of magnesium deficiency disease gradually become green and yellow, the veins appear green, the leaf margin curls up or down, and the later leaves wither. Remedy: Spray 0.3% magnesium sulfate solution on the leaves, spray once every 7-10 days, and spray 2-3 times.

Ten, calcium deficiency Calcium deficiency in wheat, the main performance in the new leaves, the upper leaves significantly reduced, yellowing between veins, leaves near the growing point, leaf margin withered, the tip often bent and hook-shaped. Remedy: Spray 0.3% calcium chloride or 1% calcium superphosphate leachate, spray once every 7-10 days, even spray 2-3 times.

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