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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.)
