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What are the control methods for soybean nutrient deficiency?

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Soybean micronutrient deficiency shows as follows: in spring soybeans, nitrogen deficiency causes the true leaves to turn yellow, and yellowing can spread from bottom to top; on the compound leaves there are parallel continuous or discontinuous iron-colored patches along the veins, and chlorosis spreads from the leaf tip toward the base until the whole leaf is pale yellow and the veins also lose green; the leaves are small and thin and fall off easily, the stems are slender, and the lower leaves of the plant are dark green, thick, uneven, and long; when sulfur deficiency is severe, the veins are yellowish-brown, and later the whole leaf turns yellow. Potassium deficiency causes leaf yellowing, with symptoms developing from the lower leaves to the upper leaves; chlorotic spots first appear at the leaf margins, then

Soybean micronutrient deficiency shows as follows: in spring soybeans, nitrogen deficiency causes the true leaves to turn yellow, and yellowing can spread from bottom to top; on the compound leaves there are parallel continuous or discontinuous iron-colored patches along the veins, and chlorosis spreads from the leaf tip toward the base until the whole leaf is pale yellow and the veins also lose green; the leaves are small and thin and fall off easily, the stems are slender, and the lower leaves of the plant are dark green, thick, uneven, and long; when sulfur deficiency is severe, the veins are yellowish-brown, and later the whole leaf turns yellow. Potassium deficiency causes leaf yellowing, with symptoms developing from the lower leaves to the upper leaves; chlorotic spots first appear at the leaf margins, enlarge into patches, and the patches join together and spread toward the leaf center, until finally only the area around the veins remains green. The yellowing is also difficult to reverse, and the leaves are thin and fall off easily.

Calcium deficiency shows as leaf yellowing with small brown spots, starting first from the middle of the leaf and the leaf tip, while the leaf margins and veins remain green; the leaf margins droop and twist, and the leaves are small, long, and have a pointed hook-like tip. Magnesium deficiency causes the upper leaves to be pale, with the main and lateral veins even paler; continuous yellow patches appear between the lateral veins, the leaf tip loses green easily, and later the yellow patches deepen to light brown; some leaves are uneven and distorted, and some have white streaks in the center of the veins.

Control methods

(1) Apply more organic fertilizer. Applying 1000-2000 kg per mu of compost fermented with effective microorganisms or decomposed organic fertilizer can prevent various mineral element deficiencies in soybeans and is also one of the important measures for increasing yield.

(2) Keep the soil moist during the soybean flowering period. However, when irrigating the field, prevent large-scale channel irrigation and flood irrigation to avoid the loss of soil nutrients.

(3) In soybean production areas with insufficient organic fertilizer, supplementing chemical fertilizers and trace elements can control soybean nutrient deficiency.

① At the flowering stage, apply 3-5 kg of urea per mu as a topdressing, or spray 50 kg of 1% urea per mu, which can prevent or correct nitrogen deficiency in soybeans;

② Apply 15-25 kg of superphosphate per mu as a basal application, which can prevent phosphorus and sulfur deficiency in soybeans;

③ Apply 5 kg of potassium sulfate per mu, or 80 kg of plant ash or kiln ash potassium fertilizer, or after potassium deficiency symptoms appear, spray 50 kg of 0.5% potassium sulfate solution, which can control potassium deficiency in soybeans;

④ Apply 75 kg per mu of lime rich in magnesium, which can control calcium and magnesium deficiency in soybeans;

⑤ Spray 50 kg per mu of 0.3%-0.5% ferrous sulfate, which can control iron deficiency in soybeans;

⑥ Spray 50 kg per mu of 0.5% manganese sulfate, zinc sulfate, or ammonium molybdate, which can control manganese, zinc, and molybdenum deficiency in soybeans;

⑦ Spray 50 kg per mu of 0.1% copper sulfate, which can control copper deficiency in soybeans;

⑧ Apply 0.3 kg of boric acid per mu or treat seeds with 0.1% borax, which can control boron deficiency in soybeans.

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