Correct Understanding And Prevention Of Cotton Deficiency Factor Can Effectively Increase Cotton Yield.

< p > deficiency is a physiological disease caused by the lack of certain nutrient elements during the growth and development of < a href= "http://cailiao.sjfzxm.com/" > cotton < /a > (19925,10.00,0.05%).

Correct understanding and prevention of < a href= "http://www.91se91.com/news/index_c.asp > cotton deficiency deficiency < /a > can effectively increase cotton yield.

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< p > 1. Nitrogen deficiency.

The growth of cotton plants is slow, the stems are short and thin, the proportion of red stems is increased, fruit branches can not stretch out, and the bud and bell are thin and shedding.

When the cotton plant is deficient in nitrogen, it should be followed up by applying quick acting nitrogen fertilizer or spraying 1%~2% urea solution.

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< p > two, phosphorus deficiency.

The cotton plant grows slowly and dwarf, the stem is thin and crisp, the leaf is small, the leaf color is dark green or the greyish green is not glossy, serious from the tip of the leaf along the leaf edge is grayish dry and has the purple, the stem also becomes purple, now bud, blooms, the boll opening postpones.

It was found that 0.3% potassium dihydrogen phosphate foliar fertilizer should be sprayed in time for cotton plants lacking phosphorus.

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< p > three, potassium deficiency.

Yellow patches appeared on the leaves first, then yellow spots appeared between the veins, and gradually expanded into brown spots. Finally, the whole leaves were reddish brown, the leaves were shrunken, the leaf margins droop, the leaves withered or fell off in advance, the stems were short and thin, the bell was small and hard to spread, the buds and bolls were shedding, and when the potassium deficiency was serious, the plants died early, and the leaves were red and stemmed.

It was found that potassium dihydrogen phosphate could be sprayed 2-3 times continuously when cotton plants were short of potassium.

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< p > four, boron deficiency.

Growth point necrosis, stop growth, only leaves bud growth, plants grow into clusters, plants are short and branched, leaves reverse curl, thick leaves, uneven, petioles appear annulus protuberance, and finally lead to "bud instead of flowers" or "flowers instead of bell", serious reduction.

It was found that 0.2% boron solution or 0.1% boric acid solution should be applied at the bud stage, the first flowering stage and the Bolling stage.

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< p > five, zinc deficiency.

The plants were dwarf, the internodes shortened significantly, the leaves became greenish and yellowish, the bolls and bolls shedding seriously, and the growth period was postponed.

When a href= "http://www.91se91.com/news/index_s.asp" > cotton > /a > zinc deficiency was found, zinc sulfate solution should be applied in cotton bud stage and flower boll stage to spray 2~4 on leaves.

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