One, zinc deficiency. From the first true leaf, the young leaves show a bronze color, and the chlorosis is evident between veins, which becomes thick and brittle and brittle. Leaves curled upward. Between the leaves, the plants are short and plexiform, their growth is hindered, the bell is delayed, and the bells are easy to fall off. Symptoms tend to occur on the old leaves of flowering and bolling stages.
Predisposing conditions: The large amount of phosphate fertilizer and the excessive application of nitrogen fertilizer will lead to insufficient zinc in the soil.
Fertilization method: Mu with zinc sulfate 1 kg mixed with fine dry soil 10 ~ 15 kg in the field before the end of application or seedling stage topdressing (be careful not to mix with urea, and pay attention to avoid the use of magnesium sulfate posing zinc fertilizer); leaf spray Utilizing 70% of UK imported "Kingfolzinc" 3000 times or 25% "Power Zinc" 1000 times, it can be sprayed once at seedling stage and budding stage.
Second, the lack of boron disease. In the seedling stage and bud stage, there are performances, mainly the thickening of the leaves, becoming brittle, dark green and dull colors, the main stem growth point is damaged, axillary buds clustered, the upper leaves atrophy. 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 is a potential lack of boron, there may be links on the petiole. Symptoms are prone to occur on emerging buds and flowering tissues.
Induced conditions: soil with less organic matter, sandy soil, soil with poor fertilizer and water retention, and long-term continuous drought and excessive rainfall, are likely to induce boron deficiency.
Fertilization method: Mu uses 200 grams of "Granubor" imported from the United States as a base. Or use 20.5% of the imported "Solubor" or 20.5% "Power Boron" 1000 times to spray once during the bud, early flowering and flowering periods.
Third, lack of manganese disease. Young leaves first appear in the veins between the 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. Symptoms are prone to occur on the upper part of the bud and the young leaves of the flowering plants.
Induced conditions: PH 7, large sand, low organic matter content of the effective manganese content is low, excessive rain easily lost.
Fertilization method: Use 0.2% manganese sulfate, 800 times potassium permanganate, or 600 times the "chlorophyllin" and other manganese (Mn) foliar fertilizer, spray once at the seedling stage, early flowering stage, flowering boll stage .
Fourth, lack of 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. Symptoms are prone to occur at the seedling stage to budding plant tissue.
Inducing conditions: a large number of application of phosphate fertilizers, sulfur fertilizers, and excessive application of manganese fertilizers.
Fertilization method: spraying with 0.05% to 0.1% ammonium molybdate solution for 2 to 3 times, and also using foliar fertilizer containing molybdenum (Mo) such as "E lead".
V. Copper deficiency. Plants are dwarf, chlorotic, and sometimes clustered at the top of the plants. When severe, the tops die. Moreover, copper deficiency in cotton is susceptible to various diseases. Symptoms are prone to occur in newborn tissue.
Induced conditions: low organic matter content, alkaline soil, and reduced copper availability; too much nitrogen fertilizer application can also lead to copper deficiency.
Fertilization method: Mu with copper sulfate 0.2 ~ 1 kg mixed with dry soil 10 ~ 15 kg evenly spread before tillage; foliar spray, available 0.02% copper sulfate, or 600 times the "green revolution" and other copper ( Cu) foliar fertilizers were sprayed once at the seedling stage and before flowering.
Six, iron deficiency disease. The phenomenon of "chlormia deficiency" or "mutancy of chlorosis" begins with chlorosis between young leaves and veins, 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. Symptoms tend to occur in newborn leaves.
Induced conditions: soil phosphorus, zinc, manganese, copper content is too high, potassium content is too low, soil viscosity, high water saturation, use of nitrate nitrogen fertilizer, will increase the iron deficiency.
Fertilization method: Mu 5 to 10 kg of ferrous sulfate at the end of application, 600 times the leaf can be sprayed with "chlorophyll" and other iron (Fe) leaf fertilizer.
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