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Short-Season Soybean Yield Compensation in Response to Population and Water Regime

^a Univ. of Saskatchewan, Dep. of Plant Sciences, 51 Campus Drive, Saskatoon, SK S7N 5A8, Canada
^b Univ. of Arkansas, Dep. of Crop, Soil, and Environmental Sciences, 276 Altheimer Drive, Fayetteville, AR 72704 USA
^c Univ. of Arkansas, Dep. of Biological and Agricultural Engineering, Northeast Research and Extension Center, P.O. Box 48, Keiser, AR 72351 USA

View larger version (20K): [in a new window]   Fig. 1 Yield per plant as a response to plant population for irrigated and nonirrigated A4922 in 1997 (A). Yield per area as a response to plant population for irrigated and nonirrigated A4922 in 1997 (B)

View larger version (25K): [in a new window]   Fig. 2 Yield versus harvest index in 1997 and 1998 for irrigated and nonirrigated treatments of A4922 and Manokin soybean over plants populations ranging from 6 to 134 plants m-2 (A). Yield versus biomass in 1997 and 1998 for the same treatments described in panel A (B). Data are the means of four replications for irrigation regime x cultivar x population combination. Yield was harvested by a plot combine, harvest index was from a separate end-of-season, six-plant subsample

View larger version (30K): [in a new window]   Fig. 3 Relationship between seed number per square meter and (A) the ratio of crop growth rate (CGR) to seed growth rate (SGR) and (B) the ratio of plant growth rate (PGR) to seed growth rate. Data are the means of four replications for year x irrigation regime x cultivar x population combination. In 1997 the low population was 22 plants m-2, the high population was 134 plants m-2; in 1998 the low population was 20 plants m-2, the high population was 91 plants m-2