Fig. 3. Leaf (non senescent) area index taken during the (a) 1996 and (b) 1997 growing seasons. Each point is the average of either two old () or two new () soybean cultivars (Table 1). The symbols *,**,*** indicates significant differences (P = 0.05, 0.01, and 0.001, respectively) between the old and the new cultivars for the sampling date

Return to article