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Light Interception and Yield Potential of Short-Season Maize (Zea mays L.) Hybrids in the Midsouth

^a Dep. of Plant and Soil Sci., Oklahoma State Univ., 368 Agricultural Hall, Stillwater, OK 74078
^b Dep. of Crop, Soil, and Environ. Sci., Univ. of Arkansas, 1366 W Altheimer Drive, Fayetteville, AR 72704
^c USDA-ARS, Portageville, MO 63873

View larger version (21K): [in a new window]   Fig. 1. Mean aboveground biomass at harvest as a function of maize plant population for (A) short-season and (B) full-season hybrids at Fayetteville, AR, in 2001, 2002, and 2003 and Keiser, AR, in 2002 and 2003. Data points are the mean value for each environment by hybrid by seeded population combination. Both linear and nonlinear regression were nonsignificant for full-season hybrids.

View larger version (23K): [in a new window]   Fig. 2. Mean yield as a function of maize plant population for (A) short-season and (B) full-season hybrids at Fayetteville, AR, in 2001, 2002, and 2003 and Keiser, AR, in 2002 and 2003. Data points are the mean value for each environment by hybrid by seeded population combination.

View larger version (28K): [in a new window]   Fig. 3. (A) Average seed mass and (B) maize seed quantity as a function of plant population at Fayetteville, AR, in 2001, 2002, and 2003 and Keiser, AR, in 2002 and 2003. Data points are the mean value for each environment by hybrid by seeded population combination.

View larger version (23K): [in a new window]   Fig. 4. (A) Maize aboveground biomass at harvest and (B) yield as a function of cumulative intercepted photosynthetically active radiation (CIPAR) at Fayetteville, AR, in 2001, 2002, and 2003 and Keiser, AR, in 2002 and 2003. Data points are the mean value for each environment by hybrid by seeded population combination.

View larger version (21K): [in a new window]   Fig. 5. Relationship between maize plant population and cumulative intercepted photosynthetically active radiation (CIPAR) for maize requiring 850, 950, 1050, or 1150°Cd from emergence to black layer as described by the equation CIPAR = –253 + 0.64 (°Cd) + 11 (maize plants m–2). Horizontal lines represent CIPAR necessary to obtain 900, 1000, and 1100 g m–2 of maize yield, respectively.