Symptoms and control methods of element deficiency in soybean

Soybean needs a variety of nutrient elements during its growth. once there is a lack of certain elements, it will cause corresponding diseases and affect the normal growth and yield of matching plants. The following editor brings you common symptoms of soybean deficiency and prevention and treatment methods, let's take a look.

1. Nitrogen deficiency

Symptoms: the true leaves of soybean are yellow when they are deficient in nitrogen, yellowing from the bottom up to the new piece at the top, the leaves are small and thin, easy to fall off, the stem will become very thin, and iron patches will appear on the compound leaves.

Prevention and control methods: to apply nitrogen fertilizer in time, foliar spraying can be used with quick effect and good effect. Generally, 5-7.5 kg of urea is applied per mu or 1% Murray 2% urea aqueous solution is sprayed evenly on both leaves. Once every other week, 2-3 times in a row, the plant will return to normal.

2. Phosphorus deficiency

Symptoms: when the soybean is phosphorus deficient, the stem is slender, the lower half of the leaf is dark green, the leaf is thick and long, the leaf surface is uneven, and the leaf vein is yellowish brown in severe cases, until all the leaves turn yellow.

Prevention and control methods: pay attention to the application of phosphate fertilizer when fertilizing, and apply phosphate fertilizer in time when symptoms are found. 12.5-17.5 kg of calcium phosphate can be applied per mu or 4% superphosphate solution of 2% Murray can be used to spray fertilizer on leaves, also once a week, 2-3 times in a row.

3. Potassium deficiency

Symptoms: potassium deficiency is that irregular yellow spots appear on the edge of the leaf, and it will gradually expand with the passage of time, the middle part of the leaf and near the leaf vein is still green, and the grain often shrinks and deforms, forming abnormal beans.

Control method: 4-5 kg potassium chloride can be applied per mu or 0.1% 0.2% potassium dihydrogen phosphate aqueous solution can be used for foliar spraying, the spraying time and times are the same as before.

4. Lack of molybdenum

Symptoms: yellowish leaves, poor plant growth, and nitrogen deficiency symptoms are similar, severe vein necrosis, leaves seriously deformed.

Prevention and control method: 0.05% Mel 0.1% ammonium molybdate aqueous solution can be used for foliar fertilizer spraying, and the effect is good.

5. Iron deficiency

Symptoms: in the early stage, the upper leaves were yellow and somewhat aggrieved, and the veins remained green. In severe cases, the new leaves, including veins, all turned white, and brown spots appeared near the leaf margin, and the old leaves withered and yellow fell off.

Prevention and treatment: 0.5% ferrous sulfate solution can be used for foliar fertilizer spraying, which can alleviate the symptoms of iron deficiency.

6. Boron deficiency

Symptoms: soybean boron deficiency will appear slow growth and development, young leaves will become light green, leaf growth deformity, Internode shortening, stem tip meristem death, can not blossom and bear pods normally, serious will lead to no harvest.

Prevention and control method: 0.5-1 kg of borax per mu can be added to the base fertilizer, and 0.1% 0.2% borax aqueous solution can be used for foliar spraying when boron is deficient in the later stage.

The above is the introduction of soybean deficiency symptoms and prevention and treatment methods, hope to help you, want to know more related knowledge, please follow us.