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Iron deficiency
The soil is alkaline, too dry or too wet, the ground temperature is low, copper, manganese, phosphorus excess, etc., iron deficiency will occur. Prevention: Keep the soil moist, prevent it from getting too dry or too wet, and reduce the amount of application to alkaline fertilizer. After the iron deficiency, the 0.1-0.5% aqueous solution of ferrous sulfate can be sprayed on the foliar surface in time.
Cause of zinc deficiency
The soil is alkaline, the zinc content is not easy to absorb; the light intensity is high and it is easy to be deficient in zinc; the phosphorus is more than zinc. Prevention: Do not apply excessive phosphorus. If zinc is deficient, 0.1-0.2% zinc sulfate aqueous solution may be sprayed on the foliage.
Copper deficiency
Alkaline soil is prone to copper deficiency. Prevention: Apply acid fertilizer to the soil. When copper is deficient, spray 0,03% copper sulfate aqueous solution on the foliage.
Boron deficiency
Soil drought, alkalinity, hunger, and excessive application of potassium fertilizer will affect the absorption of boron. Prevention: timely watering, adding organic fertilizer, increasing soil fertility, and increasing boron fertilizer. The boron deficiency can be sprayed with 0.12 to 0.25% boric acid or borax aqueous solution.
Molybdenum deficiency
Soil contains active manganese, high iron content, and more sulfur-containing fertilizers (such as phosphorus, sulfur, calcium, etc.), will inhibit the absorption of molybdenum, resulting in the lack of molybdenum. Prevention: Add organic fertilizer and alkaline fertilizer, neutralize the soil, reduce acidification, and molybdenum can be sprayed with 0.01-0.1% molybdic acid aqueous solution.
Cause of manganese deficiency
The soil organic matter content is low, the alkali and salt concentrations are high, and manganese deficiency is prone to occur. Prevention: Scientific application of chemical fertilizers, do not apply chemical fertilizers, resulting in excessive soil concentration, pay attention to the application of organic fertilizers, and activate the soil.
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