不同温度下施用钾肥对玉米生长及磷钾养分吸收的影响

Effect of Potassium Fertilizers on Growth and Nutrient Uptake of Maize Plants at Low Temperature

在砂培试验中，设置了０、１５、４０ｇ／ｋｇＫ２Ｏ施钾水平，３个施磷水平保持一致（０１０ｇ／ｋｇＰ２Ｏ５），玉米分别在网室（低温）及温室（常温）中生长，待玉米长至５叶期时测定植株的钾磷吸收状况。结果表明，温室及网室中玉米生长因施钾而受到显著影响，以施用１５ｇ／ｋｇＫ２Ｏ最有利于玉米地上部及根的生长，而其中又以网室（低温）中的生长促进效果更为显著。无论是在温室还是在网室中，施用钾肥均使玉米植株比根长显著下降。试验进一步表明，低温下施钾促进了植株对钾的吸收，同时对植株根冠部磷含量均产生显著影响，过量施钾降低了玉米根冠部磷的含量及吸磷总量，降低了单位根长吸磷量。

A pot experiment with 3 potassium application levels,0,1 5 and 4 0 g/kg(K 2O)was conducted at two temperatures to study the effect of potassium fertilizers on the growth and nutrient uptake of maize The results demonstrated that the growth of maize with 1 5 g/kg(K 2O),especially at lower temperature,is better than the other two treatments The results also indicated that,at low temperature,potassium application improved K uptake by plants and too higher potassium application results in decrease of P uptake and content of maize plants