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Maize Radiation Use Efficiency under Optimal Growth Conditions

Dep. of Agron. and Hortic., Univ. of Nebraska–Lincoln, P. O. Box 83095, Lincoln NE 68583-0915

View larger version (22K): [in a new window]   Fig. 1. Observed (symbols and error bars) total aboveground biomass of maize and the best fit of Eq. [1] at Sterling in 1998 through 2002 at Lincoln, NE. Data plotted here are for the greatest-density treatment planted in that year and the M2 fertility treatment.

View larger version (25K): [in a new window]   Fig. 2. Observed (symbols and error bars) leaf area index (LAI) of maize at Sterling in 1998 through 2002 at Lincoln, NE. Data plotted here are for the greatest-density treatment planted in that year and the M2 fertility treatment.

View larger version (16K): [in a new window]   Fig. 3. Seasonal changes in maize canopy light extinction coefficient measured and predicted as a function of a relative phenological development stage (0, emergence; 1, anthesis; 2, physiological maturity).

View larger version (18K): [in a new window]   Fig. 4. Seasonal changes in the fraction intercepted photosynthetically active radiation (PAR) in relation to relative phenological development stage (0, emergence; 1, anthesis; 2, physiological maturity).

View larger version (17K): [in a new window]   Fig. 5. Maize crop growth rate as a function of absorbed photosynthetically active radiation (APAR). Solid symbols represent observations made during the vegetative stage of development (DVS < 1.0), and open symbols represent observations made during reproductive development (1.0 < DVS < 2.0). The equation reports the slope (±SE) of the regression of crop growth rate (CGR) on APAR with a suppressed intercept (since the intercept did not differ from zero). Residual standard error of the regression was 9.98.

View larger version (18K): [in a new window]   Fig. 6. Cumulative maize aboveground biomass as a function of cumulative absorbed photosynthetically active radiation (APAR). Solid symbols represent observations made during the vegetative stage of development (DVS < 1.0), and open symbols represent observations made during reproductive development (1.0 < DVS < 2.0). Note that measurement of APAR was not initiated at emergence. The equation reports the slope (±SE) of the regression of cumulative biomass on APAR with a suppressed intercept (since the intercept did not differ from zero). Residual standard error of the regression was 166.2.