How to apply micro-fertilizer according to the symptoms of wheat leaves
In addition to the large amount of nitrogen, phosphorus, and potassium fertilizers in wheat growth, many trace elements are needed. Therefore, look at the wheat leaves and apply trace elements according to the symptoms.
1. Yellow, white and green shrinking leaves: When wheat grows short of zinc, the internodes are shortened, the leaves are clustered, the leaf margins are wrinkled, and the veins are white and green with white, yellow, white and green stripes, and the heading is late. Small spikes. 1 kg of zinc fertilizer is mixed with nitrogen, phosphorus, and potassium fertilizers. It can also be sprayed with 0.3-0.4% zinc sulphate solution and sprayed continuously for 2-3 times, separated by 5-7 days.
2, purple-brown deformity leaves: when the boron deficiency in wheat, the young leaves deformity, shrinkage, irregular green leaves between the leaves, the sheath was purple brown, the lower old leaves thickened, leaves and stems become brittle, and the growth period is delayed, flowers are not Loose powder, less pollen or deformity, sometimes no pollen, lateral expansion of the ovary, early glume is not closed, withered later. Can use 0.5 kg borax or boric acid 0.3 kg mixed with other fertilizers. Topdressing acres with 0.25 kg of borax and nitrogen fertilizer application, can also be used 150 grams of borax or boric acid 60 grams of water spray 60 kilograms, generally in the wheat seedling period, heading period of each spray 1 times.
3. Yellow and white leaves: The first iron deficiency in wheat occurs on the young leaves. The veins between the veins are chlorotic and clear. The young leaves become yellowish-white when severe. The old leaves show yellowing lesions between leaves and veins. Coking and necrosis occurs. Can use 0.2-0.3% ferrous sulfate solution to spray 2-3 times, separated by 5-7 days.
4, sharp white edge of yellow leaves: wheat lack of copper, the tip of the blade white, yellow-gray edge, new leaves become smaller, blue-green, internode shortening. When it is severe, it does not produce heading, and it does not granulate. It can be sprayed with 0.02% copper sulfate solution for 2-3 consecutive times with 5-7 days apart.
5, pendulous leaves: This disease caused by lack of manganese. First of all, from the beginning of the new leaves, the leaf chlorosis, the leaves between the veins protruding, so that the edge of the leaf wrinkles drooping. In severe cases, small brown spots appear on the leaves and there is burning and the growth stops. Can be mixed with 1 kilogram of manganese sulfate and organic fertilizer application can also be used 0.1% of manganese sulfate solution for spraying 2-3 times.
6, yellow and white spotted leaves: When wheat lacks molybdenum leaf color fade, along the veins appear small yellow-white spots, and gradually contiguous, so that the front of the leaves dry, later lead to poor grouting, grain is not full. In this regard, 0.05%-0.1% ammonium molybdate solution can be used for foliar spray, usually two sprays, separated by 5-7 days.
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