磷钾肥和多效唑对高羊茅越夏性的影响研究 Ⅲ·高温对高羊茅叶片中N、P、K含量的影响

The effects of different phosphorus、potassium and plant growth retardant application rates on the heat-resistance of Festuca arundinacea Ⅲ. The influence of high temperature on the contents of N,P,K in the leaves of Festuca arundinacea

采用三因素三水平裂裂区试验设计,2004年夏季在草坪试验基地研究磷钾肥和多效唑对高羊茅Fes-tuca arundinacea越夏性的影响。结果表明:叶片中N、P、K含量的变化均达到了极显著差异。在A2B3C2(磷:60 kg/hm2,钾:140 kg/hm2,多效唑:250 mg/L)处理下,高羊茅叶片细胞中N、P、K含量相对较高,说明肥料和化控的较优搭配能促进N、P、K素营养在高羊茅草坪草中的大量积累,为高羊茅顺利越夏提供营养基础。

The split-split plot design with three factors and three levels was employed to study the influence of different treatments with different phoshorus, potassium, plant growth retardant （PP333） applicated rates on heat resistance of Festuca arundinecea cv. Huntdog. 5 were conducted in Summer season, 2004 in Fuzhou. The results showed that the contents of N.P.K in leaves of tall festuca were significantly affected by the treatment of phoshorus, potassium and PP333, and the contents of N,P, K in the leaves of tall festuca under the treatment of A2B3C2 （A=60 kg P2O5 hm^2,B= 140 kg K2O hm^2 ,C=250 mg/L）were the highest, which appeared to improve its physiological status and in turn to promote its safe overaestivation.