光照和施钾对棉苗生长发育和钾效率的影响

Effect on the Grown of Cotton Seedlings and Efficiency of Potassium under Different Levels of Light and Applying Potassium

以湘农大棉1号为试验材料,通过不同光照和施钾处理,研究了光照和钾营养对棉苗生长发育和钾效率的影响。结果表明:弱光处理株高最高,缩短光照时间对株高无影响;不同光照下叶绿素含量差异显著:正常光照>缩短光照>弱光;缩短光照时间对棉苗地上部鲜重、单株干重无明显影响,但弱光处理对其影响较大。钾处理对株高、叶面积、叶绿素含量、单株干重表现明显差异,均以施钾值大于缺钾值,说明钾肥对棉苗生长具有明显促进作用。B1A1和B1A3处理间单株钾含量和钾积累量差异不显著,但B1A1和B1A2间的单株钾含量和钾积累量差异显著。3种光照处理间钾效率系数差异不显著。

The Xiang Nong Da 1, one mainly cultivated cotton was selected as material, growing under various levels of light and potassium. Results showed that it had highest height in sunshading, decreasing time lighting had no remarkable effect on height; it was significantly different, controlling under discrepant light in chlorophyll content： normal light 〉 reduced light 〉 sun - shading. Sun - shading, however, impacting on fresh weight of aerial part and dry weight of individual remarkably, reduced light had no impact on two characters. There are striking differences in height, leaf square, chlorophyll content and individual dry weight under different potassium levels, and those index applying for K （ ^＋ K） are higher than that in K（^- K）. This indicates that K is important especially for promoting seedlings construction and essential nutrition. It has no differ- enee in individual K content, K accumulation between B1A1 and B1A3; however, between B1A1 and B1A2, had significant difference in individual K content and K accumulation. There is no difference in the efficiency of K in three light styles.