Abstract:

The objective of this study was to explore the mechanism of high yield via analyzing related parameters. Soybean cultivars, Zhonghuang 35 and Xindadou 1 (CK) were grown in a randomized block design with three replications in 2006 and 2007. The physiological and ecological parameters associated with yield were determined. The results showed that for Zhonghuang 35 and Xindadou 1, the highest leaf area index reached 4.31 and 3.64, respectively, the green duration of leaf weight (LAI > 3) was 50 d and 36 d, total leaf area duration (LAD) at growing season was 2 766 375 and 2 385 645 m² d hm^-2, and the harvest index (ratio of seed weight to total plant dry weight) was 37.9% and 33.7%, respectively. Compared with Xindadou 1, the duration of maximum LAI of Zhonghuang 35 was long, the total LAD at growing season and the photosynthetic rate at the late stage were high. The theoretical yields of the two cultivars were 5 521.5 kg ha^-1and 4 666.5 kg ha^-1. Zhonghuang 35 showed good adaptability to the farmland ecology of the Xinjiang oasis, and gave a seed yield of 5 577 kg ha^-1.

Key words: Zhonghuang35, Super high-yield, Physiological parameter