In the process of wheat growth and development, in addition to the large amounts of nitrogen, phosphorus, and potassium, a variety of micro-fertilizers are needed. If a certain trace element is lacking, it cannot grow normally.
1 Zinc deficiency
1.1 Symptoms of zinc deficiency. Twisted or shrunk, the sides of the leaf veins changed from green to yellow to white, with yellow, white and green stripes.
1.2 Remedial measures: â‘ On the basis of applying nitrogen, phosphorus and potassium before the sowing of wheat, apply zinc sulfate kg per 667 m2. â‘¡Spray with 0.3% ~ 0.4% zinc sulfate solution immediately after zinc deficiency is found, spray 2 to 3 times in succession to make the wheat leaves green.
2 Boron deficiency
2.1 Symptoms. The leaf tips are purple-brown, the growth period is delayed, the heading and tillering are carried out, the anthers are not powdered, the pollen is little or deformed, sometimes no pollen, the ovary is laterally enlarged, the glume shell is not closed in the early stage, the late is withered, the ear is not solid.
2.2 Remedial measures. Apply 0.3 kg borax or 0.2 kg boric acid at the bottom of every 667 m2; or use borax 150 ~ 200 g or boric acid 50 ~ 100 g and water 50 ~ 60 kg for foliar spray, spraying 1 in the wheat seedling stage and the first ear stage Times.
3 Iron deficiency
3.1 Symptoms. Iron deficiency manifests as "green deficiency" or "chlorosis". At the beginning, the leaf veins of the young leaves are green and yellow, and the veins remain green. Afterwards, the leaves are completely green, and the entire leaves are yellow and white.
3.2 Remedial measures. Foliar spray with 0.75% ~ 1.0% ferrous sulfate solution, 2-3 consecutive times, the leaves can become green.
4 Copper deficiency
4.1 Symptoms. The tip of the leaf turns white, and the edge of the vein is yellowish gray.
4.2 Remedial measures. â‘ When sowing, use 1 ~ 1.5 kg copper sulfate mixed with phosphate fertilizer as base fertilizer every 667 m2. â‘¡For the symptoms of copper deficiency, foliar spray with 0.03% ~ 0.04% copper sulfate solution.
5 Molybdenum deficiency
5.1 Symptoms. The color of the leaves fades, and small yellow-white spots appear in parallel along the veins of the leaves, and gradually connect into lines and flakes, and finally dry the front end of the leaves.
5.2 Remedial measures. â‘ Mix 50 g of ammonium molybdate with phosphorus and potassium fertilizers every 667 m2 during sowing. â‘¡The symptoms of molybdenum deficiency were found to be sprayed with 0.05% to 0.1% ammonium molybdate solution every 667 m2, and sprayed continuously for 2 to 3 times.
Source: Hebei Rural Science and Technology Network
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