The diagnosis and treatment of the deficiency of soybean

Soybean is a crop that requires a large amount of fertilizer. It needs to absorb a large amount of nitrogen, phosphorus, and potassium from the soil during the entire growth period. It also needs trace elements such as calcium, magnesium, boron, manganese, molybdenum, zinc, etc. The lack of species can lead to different symptoms and result in reduced yields.

First, nitrogen-deficient soybean rhizobia can fix the free nitrogen in the atmosphere, but it can only provide 1/2 to 1/3 of the nitrogen needed for soybeans. It is far from meeting the needs of soybeans. When soybeans lack nitrogen, the leaves change. Light green, slow growth, yellow leaves, should be topdressing nitrogen fertilizer, topdressing urea 5 ~ 7.5 kilograms per acre or 1% ~ 2% of urea aqueous solution foliar spray fertilizer, spraying every 7 days or so Once, spray 2 or 3 times.

2. Phosphorus-deficient plants have dark green leaves in their early leaves, followed by a lack of green between the veins of the lower leaves, small plantlets, small, thin leaves, hard stems, and delayed flowering and ripening stages. Phosphate fertilizer should be applied in a timely manner and can be recovered per acre. Apply calcium phosphate 12.5 to 17.5 kilograms or 2% to 4% of calcium superphosphate solution to foliar spray, spraying once every 7 days, spray 2 or 3 times.

Third, the old leaf lacking potassium appears irregular yellow spots from the edge of the leaves and gradually expands. The leaf veins in the middle and other parts of the leaves are still green. The grains often shrink and deform, and potassium chloride 4 to 6 kilograms per acre can be traced. With 0.1% to 0.2% potassium dihydrogen phosphate aqueous foliar spray, spray once every 7 days, a total of 2 or 3 times.

4. In the early days of iron deficiency, the upper leaves are yellow and slightly curled, and the veins remain green. When the iron is severely deficient, the new leaves, including veins, almost turn white, and brown spots quickly appear near the leaf margins. The old leaves turn yellow and fall off, and 0.4% to 0.6% of ferrous sulfate aqueous solution can be used for foliar spray.

V. Manganese-deficient soybeans lack of manganese, growth stagnation, light green to white spots in the veins, and eventually chlorosis, but this time the veins are still green, 0.01% to 0.02% manganese sulfate solution can be used for foliar spray fertilizer .

Sixth, deficiencies in young leaves of chlorosis gradually caused by chlorosis, chlorosis began to occur in the veins, and gradually spread to the entire leaf, and can not see the obvious green veins, 0.1% to 0.2% of zinc sulfate aqueous foliar spray can be used .

VII. Boron deficient reproductive growth, young leaves become light green, leaf deformities, internode shortening, meristem meristem death, can not flowering, 0.1% to 0.2% borax aqueous solution can be sprayed on the foliage.

Eight, lack of molybdenum leaves pale yellow, poor growth, showed symptoms of nitrogen deficiency, severe necrotic veins, leaf deformation, available 0.05% ~ 0.1% ammonium molybdate aqueous foliar spray fertilizer.

The specific time for foliar spraying should be after 4 o'clock in the rainless and windless days.

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