【摘要】 以严重缺钾土壤(速效钾48. 8ppm)为介质进行玉米盆栽试验,将土壤配成低、中、高3个钾水平,氮、磷等其它肥料施量相同。测定玉米叶片中物质代谢以及产量。结果表明:低钾处理的植株叶片中可溶性糖含量低,尤其是缺钾症状严重的下部叶片外缘可溶性糖含量更低,但淀粉积累。钾能增加叶片中蛋白质含量,但过量施用钾肥则蛋白质含量下降。适量钾肥可使叶片中脯氨酸含量增加,丝氨酸含量下降。过量钾肥使叶片中游离氨含量增加。产量结果是:适量钾肥比低钾增产31. 4%,比高钾增产9. 10%,高量钾比低钾增产20. 5%。更多还原

【Abstract】 The pot culture of maize was undertaken with the K-deficientsoils which involved three K levels but similar content of other elements.The leaf substance metabolism and yield were measured.The results showed that the soluble sugar content in the leaves of plant trated with low K was lower,particularly in the lower leaf marginswith serious K-deficiency symptom,but starch accumulatedo K increased the protein in leaves,but excess K decreased it.Proper amount of K fertilizer increesed the proline,but decreased serine content in the leaves.Excess K caused the free amonia to increase in the leaves.The yields were such:proper K was higer than low K by 31. 4%,and higher than excess K by 9. 10%;excess K was higher than lowkby 20. 5%.更多还原