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1. Seedling stage: cotyledons become smaller, petiole is longer, leaves are thicker, color becomes darker, brittle and easy to fold, wilting and drooping is "a" shape (normal "Y" on the leaves); Stagnant, axillary buds sprout, forming a long, small leaf deformity seedlings. The cotton plant with short onset is short-branched and compact.
2. Bud stage: When the boron is deficient, the petiole is longer, the young bud is yellow, and the temporal lobe is open. It seems to be wormed and easily detached. The middle and lower buds are few or even buds, and the upper buds grow with the buds. Also fell off one after another. Boron deficiency in cotton is susceptible to verticillium wilt.
3. Flowering and bolling period: less flowering, small flower shape, weak growth, the petals can not be fully unfolded, the corolla is covered by the leaves, the pollen grains are poorly viable, easy to abort, the pollen is small and long after pollination, the tip is sharp and curved, the bell The base is dark brown, cracking is poor at maturity, and the vomiting is not smooth.
Boron-boron technology for boron-deficient soil (effective boron in soil is less than 0.5 mg/kg) and potential boron-deficient soil (effective boron in soil is less than 0.8 mg/kg), and boron fertilizer can be used to increase yield.
1. Base fertilizer: Before cotton planting, it can be combined with land preparation. The borax is about 0.5 kilograms per mu. It can be mixed with nitrogen, phosphorus, potassium and other fertilizers evenly. It can also be applied after mixing fine soil.
2. Fertilizer: When the cotton is planted, apply the boron fertilizer strip to the seeding ditch, use about 0.5 kg of borax, and mix well with the fine dry soil. Pay special attention to avoid contact between boron fertilizer and seeds, and do not use boron fertilizer for seed dressing.
3. Foliar application: The advantage of spraying is that boron is not easy to transfer from old tissue to new tissue in plant. Spraying boron can meet the needs of new tissue in time, and second, it can save labor with medicine and fertilizer. When the boron is severely deficient, it can be sprayed once every 10 days from the beginning of the bud, and sprayed 4-6 times in total, which can receive better yield increase effect. When the boron is slightly deficient, it can be sprayed once in the cotton bud stage, the initial flowering stage, and the flowering and bolling stage. Spraying the concentration with 0.2% borax solution is better. The amount of liquid spray: 30-40 kg per mu in the bud period, 40-50 kg per mu in the initial flowering period, and about 60 kg per mu in the flowering and ringing period.
Huaxian County Agricultural Inspection Center Zhang Yan
Symptoms of boron deficiency in cotton When the cotton is deficient in boron, the leaves are curled and shrunk, the top growth is blocked, the lateral branches are more, clustered, the buds, flowers, and bells are not normal, the cotton nectar is deformed, the vascular bundles of stems and petioles are damaged, and green belts appear. Will cause buds instead of flowers, flowers and not bells.
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