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Fig. 4. Net rice grain yield as affected by N rate and N source for research trials conducted on five silt loam soils using actual urea-N rates (
101 kg N ha–1) and fresh and pelleted litter N rates (270 kg total-N ha–1) (Fig. 4A) and a comparison of actual urea-N rates (101 kg N ha–1) with poultry litter total-N rates adjusted to urea-N fertilizer equivalents (Fig. 4B). For Fig. 4A, mean net grain yields for each site-year are shown as 
for urea, 
for pelleted litter, and 
for fresh litter.
