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First, zinc deficiency symptoms of zinc deficiency in rice, the masses call it "dwarf disease", "loud seedlings", "red seedlings", etc., usually occur 2-4 weeks after transplanting. At the beginning of the occurrence, the base of the new leaves was chlorotic and whitish. Later, the middle and lower leaves showed irregular brown spots on both sides of the ribs. In severe cases, the brown spots spread to the leaf sheaths and stems; the lower old leaves were brittle, draped, and easily broken. Short and narrow, the stem section is shortened, the upper leaf sheath overlaps, and the leaf pillows are juxtaposed. The masses call it "leaf pendulum"; the root system is aging, and the new root is less.
Second, zinc deficiency conditions 1, planted rice varieties are sensitive to zinc reactions. 2. Soil conditions. The following soils are prone to zinc deficiency: leaching of strong sandy soil; calcareous soil, zinc in the soil is often fixed and cannot be absorbed by crops; soil with high organic matter or soil with poor organic matter; poor tillage, root growth is affected by Limit the soil. 3. Fertilization. A large amount of phosphate fertilizer will induce zinc deficiency, and the general use of more than 50 kg of mu will induce zinc deficiency. 4. Weather conditions. In low temperature years, crops are prone to zinc deficiency, while in high temperature years, zinc is not easily deficient. Rainy can cause effective zinc leaching in soil.
Third, prevention and control measures. For the soil zinc deficiency field, it can be applied with 1-2 kg of zinc sulfate per mu before the transplanting of rice (cannot be mixed with super-calcium, otherwise it has antagonistic effect), or 0.3-0.5% sulfuric acid for transplanting. Mud slurry roots. For rice fields with symptoms of zinc deficiency after transplanting, the soil can be applied with 1 kg of zinc sulfate mixed with dew water, and the leaves are treated with Green Fenway No. 4 800-1000 times or “Ray Li†2000 Liquid Fertilizer 1000 times. Spraying, normal growth can be resumed 7 days after the usual administration.
Diagnosis and control of zinc deficiency in rice
Zinc is an essential trace element for crop growth and development. The national crop zinc deficiency is about 729 million mu, which is the first in the absence of zinc. In the past ten years, zinc deficiency in rice has become widespread and has been increasing year by year, posing a serious threat to food growth. In order to accurately diagnose the lack of zinc, the symptoms and prevention methods of zinc deficiency in rice are introduced as follows.
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