In the current cotton production, due to the continuous increase in yield, coupled with the widespread presence of nitrogen and phosphorus fertilizer, resulting in the occurrence of micronutrient deficiencies to varying degrees, has a great impact on the yield and quality of cotton. In view of the current actual situation, rational supplementation of micronutrients can have the desired effect of low input and high output. 1. Zinc deficiency: From the first true leaves, the young leaves are clearly bronze in color, with chlorosis between the veins. Leaves curled upward. The leaves are shortened, the plants are short and clustered, the growth is blocked, the bell is delayed, and the bells are easy to fall off. Critical indicator: Effective soil content 1X10E (-6). Predisposing conditions: The large amount of phosphate fertilizer and the excessive application of nitrogen fertilizer will lead to insufficient zinc in the soil. Effect: It can increase the pre-frost cream by 5.1%, slightly increase the length of the cashmere, and increase the yield by 8.2% to 13.3%. Fertilization method: Use 1 kg of zinc sulfate to mix 10-15 kg of fine dry soil before field tilling (be careful not to mix with urea); or spray 0.2% of zinc sulfate solution at the seedling stage and budding stage. Times. 2. Boron deficiency: It has performance in the seedling stage and bud stage, mainly due to thickening of the leaves, becoming brittle, dull green color, impaired growth of the main stem, axillary buds clustering, and atrophy of the upper leaves. To the boll shedding was serious, "buds without flowers", flowering is also difficult to peach, but the disease first appeared on the leaves. When there are potential gaps, there may be links on the petiole. Critical indicator: Soil effective content 0.8xl0E (-6). Induced conditions: soils with low organic matter, soils with poor sand retention, poor soil moisture retention, and long-term persistent drought and excessive rainfall are likely to induce boron deficiency. Effect of use: average increase of 10.3%. Fertilization method: 667 square meters with borax 0.5 kg mixed with fine dry soil 10-15 grams before uniform application in the tillage, or with 0.2% of the shed sand solution in the bud period, early flowering period, flower and spray each spray 1 times. 3. Insufficiency: young leaves first appear in the veins between dark green and light green stripes, the middle of the leaf is more obvious than the tip of the leaf. At the beginning of the tip, it is light green, and some small patches of spotting appear at the same time in the white stripe. Afterwards, the strips of dry tissue are connected and the leaves are split longitudinally. Critical indicator: Effective soil content 100x10E (-6). Induced conditions: pH>7, large sand, low organic matter content of the effective manganese content is low, excessive rain easily lost. Effect of use: The average increase in production is 14.1%. Fertilization method: 667 square meters with manganese sulfate 2 kg mixed with fine dry soil 10-15 kg uniform application before tillage; or with 0.2% manganese sulfate solution in the seedling stage, early flowering period, flowering and spraying each time. 4. Deficiency molybdenum disease: The old leaves are chlorotic, the plants are short, the leaf margins are curled, the leaves are deformed, and they are dry and fall off. Sometimes lead to nitrogen deficiency symptoms, buds, flowers off, premature aging of plants. Critical indicator: Effective soil content 0.15X10E (-6). Inducing conditions: a large number of application of phosphate fertilizers, sulfur fertilizers, and excessive application of manganese fertilizers. Use effect: Increase production by 18.6%~23.2%. Fertilization method: Spray the solution 2-3 times with 0.05% -0.1% lead-acid. 5. Copper deficiency disease: The plants are short and chlorotic. The top of the plant is sometimes clustered. In severe cases, the top of the plant is dead. Moreover, copper deficiency in cotton is susceptible to various diseases. Critical indicator: Effective soil content 0.2X10E (-6). Induction conditions: low organic matter content and alkaline soil. The effectiveness of copper is reduced; too much nitrogen fertilizer can also cause copper deficiency. Effect of use: Increase production by 14.5%-17.3%. Fertilization method: 667 square meters with copper sulfate 0.2-l kg mixed with dry soil 10 ~ 15 kg evenly before sowing; or 0.01%-0.05% of copper sulfate soaking 12-24 hours, after sowing; or A 0.02% copper sulfate solution was sprayed at the seedling stage or before flowering. 6. Iron deficiency: It appears as "chlormia deficiency" or "mutancy of chlorosis." At the beginning, young leaves and veins are chlorosis, and the veins remain green. Afterwards, they are completely chlorotic. Sometimes the entire leaf appears yellowish-white at first. The stems are short and weak, many new leaves are chlorotic, and old leaves can still be green. Critical indicator: Effective soil content 4.5xl0 (-6). Induced conditions: soil phosphorus, zinc, manganese, copper content is too high, potassium content is too low, soil erosion, high water saturation, use of nitrate nitrogen fertilizer, will increase the iron deficiency. Use effect: Use of saline-alkali soil can improve the soil and promote production increase. Fertilization method: 667 square meters with 0.5-l kg of ferrous sulfate as the end of application.
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