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Planting Configuration x Cultivar Effects on Soybean Production in Low-Yield Environments

^a 17360 Coit Road, Dallas, TX 75252
^b 1509 Aggie Drive, Beaumont, TX 77713-8530

View larger version (27K): [in a new window]   Fig. 1. Soybean plant circumference as a function of row spacing for six cultivar x seeding rate combinations. Data are averaged across years. With data averaged across cultivar and seeding rate, regression was significant (P = 0.02). PC and RS represent plant circumference and row spacing, respectively.

View larger version (33K): [in a new window]   Fig. 2. Effect of third uppermost trifoliolate leaf size and row spacing (36 vs. 71 cm) on canopy closure of seven small- and seven large-leaf soybean cultivars grown at (A) Dallas, TX, 2000; and (B) Prosper, TX, 2001. Bars indicate LSD (0.05).

View larger version (23K): [in a new window]   Fig. 3. Yield as a function of leaf area (third uppermost trifoliolate) for 14 soybean cultivars grown in 36- and 71-cm rows at two north Texas locations: (A) Dallas, 2000; (B) Prosper, 2001. No significant relationships were found.

View larger version (25K): [in a new window]   Fig. 4. Relationship between yield and plant height of 23 soybean cultivars grown in two row spacings at Beaumont, TX, in (A) 2000 and (B) 2001. No statistically significant relationship was found.

View larger version (32K): [in a new window]   Fig. 5. Relationship between wide-row (76 cm) and narrow-row (18 cm) soybean yield at Beaumont in (A) 2000 and (B) 2001.