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Long-Term Evaluation of Poultry Litter as a Source of Nitrogen for Cotton and Corn

^a Dep. Agron. & Soils, Auburn Univ., Auburn, AL 36849
^b Soil and Plant Nutrition Dep., Central China Agric. Univ., Wuhan 430070, China

View larger version (20K): [in a new window]   Fig. 1. Effect of total N rates as broiler litter (BL) and ammonium nitrate (AN) and a growth regulator (Pix) on the height of cotton plants at Tennessee Valley Research and Extension Center in 1990. Error bar is standard error of the means.

View larger version (26K): [in a new window]   Fig. 2. Effect of total N rate applied either as ammonium nitrate or broiler litter on crop yield increases above the no-N treatment in experiments at a Tennessee Valley and a Coastal Plain site from 1990 to 2002. Stepwise regression was performed on least squares year x treatment means to arrive at the best-fitted model based on the coefficient of determination. Because the response variable was yield increase above the zero N treatment, all regressions were modeled without an intercept term. Numbers to the right of regression lines refer to the corresponding equation given in Table 4.

View larger version (31K): [in a new window]   Fig. 3. Residual effect of broiler litter (BL) at three rates on corn grain yield (1995–1997) and cotton lint yield (1998–2002) at three total N rates on a Coastal Plain soil. Residual effects were measured the year after application.

View larger version (22K): [in a new window]   Fig. 4. Precipitation during the growing season at the Coastal Plain site on yield relative to the no-N control treatment from 1991 to 2002. AN, ammonium nitrate; BL, broiler litter.

View larger version (21K): [in a new window]   Fig. 5. The regression relationship between relative N availability factor and N rates. BL, broiler litter; AN, ammonium nitrate.