氮肥与多效唑对冬小麦叶片生理功能的调控

为解决冬小麦拔节期培育壮苗、后期抗倒伏能力以及追施氮肥导致营养生长过旺之间的矛盾，达到提高冬小麦产量和品质的目的。采用二因素交叉试验设计，研究了不同施氮水平下多效唑对小麦叶片生理功能的影响。结果表明，与对照相比，氮肥与多效唑配合施用不仅提高了小麦的叶面积，显著增加叶片的叶绿素含量和光合速率；同时也增强了冬小麦叶片中超氧化物歧化酶活性，提高了冬小麦的抗逆性。石灰性褐土上冬小麦拔节期氮肥与多效唑的推荐用量分别为N 104.2～156.3 kg/hm2和1.13～1.50 kg/hm2。

Regulation of paclobutrazol and N fertilizer on physiological function of winter wheat leaves

In order to cultivate strong winter wheat spout in the jointing stage, settle the contradiction between the excessive vigor growth resulted form the application of N fertilizer and strengthing the lodging-resist ability of winter wheat in the later period of winter wheat, field experiment was conducted to study the physiological effects of paclobutrazol at different N-application levels on winter wheat leaves. Two-factor-overlapping design was adapted in this study. The results indicated that, compared with the control, the application of paclobutrazol and N not only increased wheat leaf area, but also improved significantly chlorophyll content and photosynthesis rate. Meanwhile, the SOD activities of leaf were increased, and stress resistance was strengthened. The recommended application rates of N and paclobutrazol of winter wheat at the jointing stage were N 104.2–156.3kg/ha and 1.13–1.50 kg/ha，respectively in the lince brown soil.