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Radiation Use Efficiency and Biomass Production in Soybean at Different Plant Population Densities

^a Dep. of Crop, Soil, and Environmental Sciences, Univ. of Arkansas, 1366 W. Altheimer Drive, Fayetteville, AR 72704
^b Univ. of Saskatchewan, Dep. of Plant Sciences, 51 Campus Drive, Saskatoon, SK 5A8 S7N, Canada
^c Dep. of Biological and Agricultural Engineering, Univ. of Arkansas, Northeast Research and Extension Center, P.O. Box 48, Keiser, AR 72351

View larger version (22K): [in a new window]   Fig. 1. Incident PAR vs. day of year at Keiser, AR, in 1999.

View larger version (25K): [in a new window]   Fig. 2. Fraction of light intercepted at 11, 22, and 46 d after emergence (DAE) was regressed against population density for ‘Manokin’ soybean at Fayetteville, AR, in 1999, using a monomolecular model . The a coefficient was 0.42, 0.88, and 0.99, and the b coefficent was 0.015, 0.062, and 0.90 for 11, 22, and 46 DAE, respectively.

View larger version (38K): [in a new window]   Fig. 3. Shoot biomass at crop maturity vs. cumulated PAR from emergence to the beginning of the R6 developmental stage. Data for individual cultivars are shown for Exp. 1 and 2 at Fayetteville, AR (1999), and for early-sown and late-sown experiments at Keiser, AR (1999).