Abstract: In order to supply references to ameliorating dry land, water-saving agricultural cultivation and choosing resistant varieties, the paper analyzed ??13C variance of two maize variet ies ( Zhengdan 958 and Ludan 981) and water treatments in LSD, and carried on a qualitative analysis on its relationship with leaf weight, water use efficiency and yield. The study found that Ludan 981 had a faster growth, higher plant height and worse lodging resistance than Zhengdan 958, but the yield of the former was higher than the latter. The difference of ??13C value of leaves between the two variances was not obvious. Different varieties of the same water treatment lead to different ??13 C values as a result of genet ic factors, and the same variety of different water treatment resulted in different ??13C values due to environmental factors.The ??13C values of the two varieties showed a consistent trend of negative correlat ion with yield, but a opposite trend with leaf weight and water use efficiency.Among them, with emphasis on the relevance of leaf weight, the Zhengdan 958 showed positive correlation, but Ludan 981 showed negative correlat ion;with emphasis on the relevance of water use efficiency, the Zhengdan 958 was a negative correlation trend, but Ludan 981 was a positive correlation trend.

Key words: Summer maize, ??13C value of leaves, Water use efficiency, Yield

CLC Number: 

• S73