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棉花是喜钾作物,钾肥在棉花生长发育过程中起着重要的作用。它能加速棉花对氮的吸收,协调营养生长和生殖生长,增进光合作用,增强抗逆性,改善纤维品质,提高产量。长江流域棉区土壤速效钾含量为126ppm(含钾量在150ppm以下为棉花施钾有效区域),属缺钾棉区。 缺钾的原因是:①重施氮肥轻施钾肥;②棉区产量不断提高,需钾量不断增加;③棉花连作,施钾跟不上,土壤中含钾量逐渐下降;④棉花现蕾开花期需钾量最大,约占全生育期的
Cotton is a hi potassium crop, which plays an important role in cotton growth and development. It can speed up cotton’s absorption of nitrogen, coordinate nutrition growth and reproductive growth, enhance photosynthesis, enhance resistance, improve fiber quality and increase yield. The soil available K in the cotton area of the Yangtze River Basin is 126ppm (potassium is less than 150ppm for cotton potassium effective area), is a kapok area. Potassium deficiency is due to: ① heavy application of nitrogen fertilizer K fertilizer lightly; ② cotton yield continued to increase, increasing the amount of potassium required; ③ cotton continuous cropping, potassium can not keep up, soil potassium content gradually decreased; ④ cotton buds flowering The maximum amount of potassium required, accounting for the entire growth period