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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.
