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Row Width and Maize Grain Yield

^a Dep. de Producción Vegetal, Fac. de Agronomía, Univ. de Buenos Aires, Av. San Martín 4453, Ciudad de Buenos Aires (C1417DSE), Argentina
^b Estación Experimental Agropecuaria Pergamino, Instituto Nacional de Tecnología Agropecuaria, Ruta 32 km 4.5, C.C. 31, Pergamino (B2700WAA), Buenos Aires, Argentina

View larger version (20K): [in a new window]   Fig. 1. (A) Maximum fraction of incident photosynthetic active radiation intercepted (fPAR) by crops cultivated in wide rows (WR) vs. those in narrow rows (NR); and (B) red:far-red ratio (R/FR) reaching the ear leaf layer and the lowermost green leaf layer of crops in WR vs. those in NR. Data points represent the mean values of each treatment (plant population x row spacing x hybrid) in all experiments (Fig. 1A), and in E1 and E2 (Fig. 1B). Black symbols, hybrids of small kernel weight; gray symbols, hybrids of large kernel weight. The solid lines indicate the model fitted to the data set. The dashed line indicates the 1:1 relationship between variables.

View larger version (32K): [in a new window]   Fig. 2. (A) Amount of photosynthetic active radiation intercepted (IPAR) during the period around silking, and (B) during the effective grain filling period by crops cultivated in wide rows (WR) vs. those in narrow rows (NR). Data points represent the mean values of each treatment (plant population x row spacing x hybrid) in all experiments. Black symbols, hybrids of small kernel weight; gray symbols, hybrids of large kernel weight. The solid lines indicate the model fitted to the data set. The dashed line indicates the 1:1 relationship between variables.

View larger version (34K): [in a new window]   Fig. 3. Crop growth (CG) during the effective grain-filling period as a function of (A) the amount of intercepted photosynthetic active radiation (IPAR), and (B) radiation use efficiency (RUE) during this stage. Data points represent the mean values of each treatment (plant population x row spacing x hybrid) in E2, E3, and E4. Black symbols, hybrids of small kernel weight (full symbols crops in narrow rows, NR; empty symbols crops in wide rows, WR); gray symbols, hybrids of large kernel weight (dark gray crops in NR, light gray crops in WR). The lines indicate the model fitted to the data set.

View larger version (31K): [in a new window]   Fig. 4. (A) Relative kernel number per unit land area as a function of the relative amount of intercepted photosynthetic active radiation (IPAR) during the period around silking. Kernel number of each treatment was expressed as a proportion of the maximum kernel number recorded in each experiment (7460, 6053, 4181, and 4557 kernels m–2 for E1, E2, E3, and E4, respectively). The IPAR was also expressed as a proportion of the maximum IPAR registered in each experiment (218.6, 317.2, 343.7, and 357.6 MJ m–2 for E1, E2, E3, and E4, respectively). (B) Kernel number per square meter as a function of crop growth (CG) rate during the period around silking in E2. Data points represent the mean values of each treatment (plant population x row spacing x hybrid). Symbols as in Fig. 3. The solid lines indicate the model fitted to the data set.

View larger version (34K): [in a new window]   Fig. 5. Kernel weight as a function of the amount of photosynthetic active radiation intercepted (IPAR) per kernel (A) and crop growth (CG) per kernel (B), during the effective grain-filling period. Data points represent the mean values of each treatment (plant population x row spacing x hybrid) in all experiments (Fig. 5A), and in E2, E3, and E4 (Fig. 5B). Symbols as in Fig. 3. The solid lines indicate the models fitted to the data set. The dashed line indicates the 1:1 relationship between variables.