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Tillage and Poultry Litter Application Effects on Cotton Growth and Yield

^a Dep. of Plant and Soil Sci., Alabama A&M Univ., Normal, AL 35762
^b USDA-ARS, J. Phil Campbell Sr. Nat. Resour. Conserv. Cent., Watkinsville, GA 30677

View larger version (24K): [in a new window]   Fig. 1. Yearly and cumulative biomass yields of winter rye cover crop as influenced by ammonium nitrate (AN) and poultry litter (PL) N sources applied to cotton, Belle Mina AL, 1997 to 2001. (Means of yearly biomass for N treatments with the same letter are not significantly different at the 5% level.)

View larger version (41K): [in a new window]   Fig. 2. Cotton plant height as influenced by conventional tillage (CT) and no-tillage (NT) systems and 100 kg N ha–1 in the form of ammonium nitrate (100AN) or poultry litter (100PL), Belle Mina AL, 1997 to 2001. (Means of tillage systems and N treatments for each year with the same letter are not significantly different at the 5% level.)

View larger version (35K): [in a new window]   Fig. 3. Leaf area index of cotton as influenced by cotton followed by winter fallow (WF) and cotton followed by winter rye (WR) cropping systems in conventional tillage (CT) and no-tillage (NT) systems and as influenced by 100 kg N ha–1 in the form of ammonium nitrate (100AN) or poultry litter (100PL), Belle Mina AL, 1997 to 2001. (Means of WF and WR cropping systems within a tillage system and means of N treatments for each year with the same letter are not significantly different at the 5% level.)

View larger version (32K): [in a new window]   Fig. 4. Number of cotton bolls per plant as influenced by cotton followed by winter fallow (WF) and cotton followed by winter rye (WR) cropping systems in conventional tillage (CT) and no-tillage (NT) systems; 100 kg N ha–1 in the form of ammonium nitrate (100AN) or poultry litter (100PL) treatments in CT, mulch tillage (MT), and NT; and CT and NT systems in 1997, 1998, and 2001, Belle Mina AL. (Means of WF and WR cropping systems within a tillage system, means of N treatments within a tillage system, and means of tillage systems for each year with the same letter are not significantly different at the 5% level.)