中文摘要：

田间条件下,在半干旱地区,通过对不同耐旱型大豆品种进行灌溉,探讨品种和灌溉对大豆生理性状及产量的影响。结果表明：灌溉提高了同一品种的LAI、株高、地上部生物产量、叶绿素含量,但却降低了根冠比值。同一处理,各时期地上部生物量表现为：R6〉R4〉R2,根冠比值表现为：R2〉R4〉R6。灌溉与品种均显著影响大豆产量的形成,且灌溉效应大于品种效应。灌溉提高了同一大豆品种的产量,但辽豆21产量提高的更多。同一灌溉条件下,辽豆14产量优于辽豆21。灌溉提高了大豆植株的株高、主茎节数、节间长度。同一灌溉条件下,辽豆14的株高、主茎节数高于辽豆21,但节间长度却低于辽豆21。

英文摘要：

A field experiment is conducted to investigate the effects of two irrigation regimes （irrigation and no irrigation） and two cultivars （Liaodoul4 and Liaodou21 ） on physiological characteristics and yield of soybean. The results indicate that irrigation increases LAI, plant height, shoot biomass and SPAD value but decreases the ratio of root to shoot of the same cultivar ; the shoot biomass of the same treatment in different growth stages shows the order of R6〉R4〉R2, while the root to shoot ratio shows the order of R2〉R4〉R6 ; both irrigation and culhave significant effects on soybean yield, while irrigation has more effects than cuhivar; irrigation enhances the yield of the same soybean variety and the Liaodou21 increases more yield than Liaodou14; Liaodou 14 has higher yield than Liaodou 21 under the same irrigation condition; irrigation also increases plant height, node number, internode length of the same soybean cultivar; under the same irrigation condition, Liaodou 14 has higher plant height and main stem node number, and lower intemode length than Liaodou 21.