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Genetic Improvement in Short Season Soybeans

I. Dry Matter Accumulation, Partitioning, and Leaf Area Duration

^a Plant Science Dep., Rutgers Univ., 125 Lake Oswego Rd., Chatsworth, NJ 08055
^b Office of Research, Univ. of Guelph/Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA), 1 Stone Road West, Guelph, ON, Canada N1G 4Y2
^c Dep. of Plant Agriculture, Univ. of Guelph, Guelph, ON, Canada N1G 2W1

View larger version (33K): [in a new window]   Fig. 1. Yield of two old and two modern soybean cultivars (see Table 1) averaged over 2 yr and grouped as early and late-maturing cultivars (yield adjusted for 14% moisture content). Columns with the same letter are not significantly different at the 5% level

View larger version (18K): [in a new window]   Fig. 2. Total plant dry weight (stems, pods and non senescent leaves) 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

View larger version (19K): [in a new window]   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

View larger version (22K): [in a new window]   Fig. 4. Vegetative (stems and non senescent leaves) tissue (solid lines) and pod tissue (dashed lines) dry weights 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 ** and *** indicate significant differences (P = 0.01 and 0.001, respectively) in vegetative tissue dry weights between the old and the new cultivars for the sampling date. The symbols ,, and indicates significant differences (P = 0.05, 0.01, and 0.001, respectively) in pod tissue dry weights between the old and the new cultivars for the sampling date