A New Curve of Critical Nitrogen Concentration Based on Spike Dry Matter for Winter Wheat in Eastern China
Fig 5
Comprehensive validation of the spike Nc curve using the independent data set from the experiment conducted during 2007–2008.
Data points (□) and (△) represent N-limiting and non-N-limiting treatments, respectively. The solid line in the middle represents the critical N curve (Nc = 2.85×SDM-0.17) that describes the relationship between the critical N concentration and spike dry matter of rice. The data points (●) and (○) that were not used for establishing the parameters of the allometric function (2009–2011) were used to develop two limit curves (--------): minimum limit curve (Nmin = 1.86×SDM-0.41) and maximum limit curve (Nmax = 3.57×SDM-0.12).