"Three-color" wrinkled leaves: When the wheat is deficient in zinc during the growing season, the leaf margin of the wheat leaves is shrunken or twisted, and the veins are greenish yellow to white on both sides, showing yellow, white, and green stripes, and the heading is late and the ear is Less granules, for this zinc deficiency, immediately sprayed with 0.3% to 0.4% zinc sulphate solution on the leaf surface for 2 to 3 times.
Yellow-leaf leaves: These leaves are caused by iron deficiency. At the beginning, the leaves of young leaves are green and yellow, the veins remain green, and they are completely chlorotic. Sometimes the whole leaves are yellow-white. For this, the surface can be sprayed 2 to 3 times with 0.75% to 0.9% of ferrous sulfate solution.
Yellow leaves with sharp white edges: the tip of the leaves turns white, and the edges are yellow-gray. These leaves are caused by copper deficiency. In severe cases, it is not possible to head at the heading stage. The control method is: foliar spraying with 0.03% to 0.04% copper sulfate solution for 2 to 3 times.
Soft drooping leaves: When wheat is deficient in manganese, the leaves are soft and drooping, and the veins turn from green to yellow. For this purpose, foliar application can be carried out twice with 0.1% manganese sulfate solution.
Yellow-white spotted leaves: When the wheat is deficient in molybdenum, the leaf color becomes lighter, and fine yellow-white spots appear along the veins in parallel, and gradually become linear or flaky, and finally the front part of the leaves is dried up. For the phenomenon caused by such molybdenum deficiency, the prevention and treatment method is: foliar spraying of 2 to 3 times with 0.05% to 0.1% ammonium molybdate solution.
Purple-brown leaves: When the wheat is deficient in boron, the growth period is delayed, and the leaf tips are purple-brown. At the same time, its flowers are not loose powder, pollen is less or deformed, sometimes there is no pollen, the ovary is laterally enlarged, the husk is not closed in the early stage, and it is withered in the later stage. It can be used for foliar application of 50-100 grams of boric acid and 50-60 kilograms of water, usually sprayed once in wheat seedling stage and beginning seeding stage. (Dongping County, City Technical Instructor Wang Guangdong)
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