钾营养对水培棉花生长发育的影响

通过营养液培养研究钾营养对棉花生长发育的影响,结果表明:与对照相比,适当提高营养液中K的浓度.能明显促进棉花生长,其株高、叶面积均增高、增大;棉花株高的生长呈"S"形曲线生长即初期慢.中期快,后期又慢,直至稳定生长,棉花主茎平均日增长量呈单峰曲线动态变化.充足的K营养也促进了棉花根系的发育.提高了根系活力、根系总吸收面积及活跃吸收面积,但品种的不同,其表现也不同.新陆早13的低钾处理优于高钾和对照处理,中棉36随K浓度增加表现更优.与此同时提高营养液中K的水平.也能明显提高叶片中chla、chlb和叶绿素含量,但K过高不利于叶绿素的合成,试验的两个品种在此范围内表现一致,低钾处理>高钾处理>对照处理.

Effects of Potassium nutrition on Growth of Cotton on Liquid Foster

This experiment is conducted to study effects of potassium nutrition on growth of cotton through water culturing. The main results were as follows:.compared with CK, the growth of cotton was promoted obviously, and stem height , the leaf area were all increased because of boosting of K concentration in nutrient properly. Under this trial conditions, a cotton high growth assumes "S" the shape curve growth is the initial period slow, intermediate stage quick, later period also is slow, until stops growing. The velocity of stem growth assumes the single apex curve variety.The sufficient K nutrition also promoted the cotton root system growth, the activity of roots, the total absorption and active absorption area were increased, but there is discrepancy in difference varieties, low potassium surpasses high potassium and CK about "XinLuzao 13" , "ZhongMian36" is more superior along with the K concentration increasing.The content of Chla, Chlb and Chl were all increased with the improving of K in nutrient,but high potassium was not propitious to the synthesis of chlorophyll, two varieties cottons display consistently, the content of chlorophyll of low potassium is more than that of high potassium,which is more than that of CK in this experiment.