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Soybean Yield and Biomass Responses to Increasing Plant Population among Diverse Maturity Groups

II. Light Interception and Utilization

^a Dep. of Plant and Soil Sciences, Oklahoma State Univ., 368 Agricultural Hall, Stillwater, OK 74078
^b Dep. of Crop, Soil, and Environmental Sciences, Univ. of Arkansas, 1366 W Altheimer Drive, Fayetteville, AR 72704
^c Dep. of Horticulture, Univ. of Arkansas, Plant Science Building, Fayetteville, AR 72703

View larger version (14K): [in a new window]   Fig. 1. General response curve of yield, biomass, relative yield, and relative biomass (dependent variables) to cumulative intercepted photosynthetically active radiation (CIPAR) from emergence to R6. The asymptote is calculated as the sum of ß0 and coefficients, and ß1 describes the responsiveness of Y to increasing CIPAR.

View larger version (21K): [in a new window]   Fig. 2. Response of harvest index to cumulative intercepted photosynthetically active radiation (CIPAR) from emergence to R6 for MG 00 through VI soybean sown at different population densities at Fayetteville, AR, in 2001, 2002, and 2003.

View larger version (30K): [in a new window]   Fig. 3. Relative above-ground biomass at (A) harvest and (B) relative soybean yield responses to cumulative intercepted photosynthetically active radiation (CIPAR) from emergence to R6 for MG 00 through VI soybean sown at different population densities at Fayetteville, AR, in 2001, 2002, and 2003. Relative values are expressed as a fraction of the highest yielding combination of cultivar and seeding density within a given year.

View larger version (22K): [in a new window]   Fig. 4. Relationship between soybean plant population (PP) and cumulative intercepted photosynthetically active radiation (CIPAR) for soybean requiring 80, 90, 100, or 110 d from emergence to R6 (DTR6). Isolines represent CIPAR predicted by the equation CIPAR = –585 + 2.49(PP) + 16(DTR6) – 0.0027(PP2) – 0.037(DTR62) – 0.0058(PP x DTR6). Horizontal lines indicate CIPAR necessary to obtain 90 and 95% of asymptotic relative yield as described by Eq. [2].