Symptoms 1. Nitrogen-deficient shoots are dwarfed, thin, and yellow-green leaves; leaves turn yellow from the tip of the leaf, develop along the midrib of the leaf, forming a "V"-shaped yellowing part; causing whole plant yellowing and withering at the lower tip. And the edges are yellow-green; nitrogen deficiency is severe or lacks nitrogen in the key phase, the ear is small, the top grain is not full, and the protein content is low. 2. Phosphorus-deficient strains are sensitive and the plants are dwarfed; leaf tips and leaf margins are purplish red, and the posterior leaf ends are dead or turn dark purple-brown; roots are underdeveloped, the pollination of the ear is blocked, the grain is not full, and the ear is small or distort. 3. The tip and leaf margin of the lower potassium deficiency leaves are yellow or red and scorch, and the late plants are easy to fall down, the ear is small, and the top is not well developed. 4. The upper leaves of the magnesium-deficit seedlings are yellow. Yellow and white chlorotic stripes appear between the veins, and the tips and edges of the lower old leaves are purple; those with severe magnesium deficiency are dead, and yellow veins and green stripes appear or dwarf the whole plant veins. Five, severe zinc deficiency seedlings manifested disease within 2 weeks after unearthing, the leaves had light white stripes, an albino broadband tissue area appeared on both sides of the posterior midvein, and the midrib and the edge were still green, sometimes the leaf margins and sheaths were brown or red. Sixth, sulfur-deficient plants dwarf, yellow leaves, mature delay, and nitrogen deficiency symptoms are similar. Seven, iron deficiency between the upper leaf veins appear light green to white or full leaf discoloration. 8. Irregular white spots appear between veins deficient in boron and young leaves, and spots can be fused into white stripes; severe internode elongation is inhibited or can not be drawn and spit. Nine, calcium deficiency When the soil lacks calcium, the leaves of the seedlings can not be extracted or not expanded, and some of the tips of the seedlings stick together to form a ladder, and the plants are slightly yellowish green or cause dwarfing. Ten, manganese-deficit young veins ask the organization to slowly turn yellow, forming yellow and green stripes, the leaves under the curve, unlike the lack of magnesium.

First, nitrogen deficiency is due to low organic matter content, low temperature or flooding, especially in the medium-term drought or heavy rain prone to nitrogen deficiency. Second, phosphorus deficiency, low soil moisture is conducive to disease, acidic soil, red soil, yellow soil susceptible to lack of available phosphorus. Third, the lack of potassium generally sandy soil contains low potassium, such as the former as a high potassium demand crops, prone to potassium deficiency, sand, fertilizer, soil, damp or bentonite easy to disease. 4. Magnesium-deficient soils have high soil acidity or are vulnerable to magnesium deficiency due to heavy rain. The high potassium content or the reduced magnesium content caused by the use of lime reduces soil susceptibility to disease. 5. The zinc-deficient soil or fertilizer contains too much phosphorus. Soils with high pH, ​​low temperature, high humidity, or low organic fertilizer are prone to zinc deficiency. Sixth, the lack of sulfuric acid sandy soil, organic matter content is small or cold damp soil susceptible to disease. Seven, iron deficiency in alkaline soil easy to iron deficiency. VIII. Boron-deficient drought, high soil acidity, or sandy soil prone to boron deficiency. Nine, calcium deficiency is due to soil acidity is too low or mineral soil, pH5.5 below, soil organic matter below 48mg/kg or potassium, magnesium content is prone to calcium deficiency. 10. Manganese is susceptible to leaching when lime-minimized soils with a manganese pH greater than 7 or near a river block are missing. The excessive application of lime in production can also lead to deficiency of manganese.

The etiological control methods (1) should be correctly diagnosed based on the plant analysis and soil test results and the lack of disease symptoms. (2) Promote the use of compost or decomposed organic fertilizer made from Japanese enzyme bacteria. The use of formula fertilization technology, according to the amount of corn supplement fertilizer deficiency. (3) Leaf fertilizer can also be sprayed symptomatically on the leaves in the early stage of the disease. Huimanfeng multi-element composite organic active liquid fertilizer 210-240ml, 300-400 times diluted with water or promote Fengpo active liquid fertilizer E-600-800 times liquid, multi-functional high-efficiency liquid fertilizer Wanwanbao 500-600 times liquid.

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