Fig. 3. Tillage effects on leaf area index (LAI) over the growing season for cotton cv Stoneville 453 on a Gigger silt loam in 1991, 1992, and 1994. Tillage treatments had been in place since 1987. Error bars represent LSD 0.05 unless subtended by (LSD 0.10). Differences between points at a given time not having an error bar are NS.