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Genetic Improvement Rates of Short-Season Soybean Increase with Plant Population

Agric. & Agri-Food Canada, Eastern Cereal & Oilseed Res. Ctr., Bldg. 110, Ottawa, ON, Canada, K1A 0C6

View larger version (23K): [in a new window]   Fig. 1. Mean seed yield over plant populations derived from a) 42 cultivars (Exp. 1), and b) seven soybean cultivars (Exp. 2) released from 1934 to 1993, from trials grown at Ottawa, ON. LSD 0.05 for Exp. 1 in 1998 on clay loam and sandy loam are 58 and 85 and for 1999 on clay loam and sandy loam are 82 and 111; and for Exp. 2 for 1999 on clay loam and sandy loam are 207 and 214 and for 2000 on clay loam and sandy loam are 225 and 195, respectively.

View larger version (22K): [in a new window]   Fig. 2. Seed yield of seven short-season soybean cultivars and their year of release over a series of seeding rates (Exp. 2) from trials grown on a) clay loam and b) sandy loam in 1999; and c) clay loam and d) sandy loam in 2000 at Ottawa, ON. Least Significant Differences (0.05) between any two cultivar by seeding rate means for 1999 clay loam and sandy loam are 548 and 567 and for 2000 clay loam and sandy loam are 596 and 516, respectively.

View larger version (23K): [in a new window]   Fig. 3. Mean genetic improvement rates as influenced by plant population derived from a) 42 cultivars (Exp. 1), and b) seven soybean cultivars (Exp. 2) released from 1934 to 1993, from trials grown at Ottawa, ON. Standard errors of means for Exp. 1 in 1998 on clay loam and sandy loam are 2.5 and 2.4 and for 1999 on clay loam and sandy loam are 3.2 and 2.9; and for Exp. 2 for 1999 on clay loam and sandy loam are 4.3 and 4.1 and for 2000 on clay loam and sandy loam are 4.8 and 5.9, respectively.