Figure 4. Comprehensive validation of N_c dilution curve using independent data set from experiment conducted in 2007.

Data points (◊) represent N limiting growth conditions, while (□) represent N non-limiting conditions. The solid line in the middle represents the N_c curve (N_c = 2.17W^−0.27) describing the relationship between the N_c and stem dry matter of rice. The data points (Δ) and (○) not engaged for establishing the parameters of allometric function (2010 and 2011) were used to develop two boundary curves, (–•–•–•) minimum limit curve (N_min = 1.19 W^−0.31) and (------) maximum limit curve (N_max = 2.27W^−0.25).