The effect of different seeding rates and nitrogen levels on the leaf area of Ischaemum rugosum.

Leaf area data were fitted to an exponential model: l = y0+a×e−bx, where l is the leaf area (cm2 plant−1) at different seed rates (kg ha−1) x, y0 is the minimum leaf area at seed rate 100 kg ha−1, y0+a is the maximum leaf area at seed rate 0 kg ha−1, and b is the slope. Parameter estimates are followed by standard error in parentheses.