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Fig. 1. Predicted aboveground dry matter accumulation of rice at the midtillering stage as affected by Zn fertilizer source and application rate during 2000 at the Pine Tree Branch Station (PTBS) and Rice Research Extension Center (RREC). For reference, the mean dry matter accumulations for the unfertilized controls (0 kg Zn ha–1) are shown as 
. For the RREC, mean dry matter values are shown as • for zinc sulfate 31% Zn (ZnSul31), 
for zinc lignosulfonate 10% Zn (ZnLig10), 
for zinc oxysulfate 20% Zn (ZnOxy20), and 
for zinc oxysulfate 36% Zn (ZnOxy36). For the PTBS, standard errors were 20.1 for intercept and 1.8 for linear coefficient. For the RREC, standard errors were 38.4 for intercept, 9.6 for linear coefficient, and 0.47 for the quadratic coefficient.
