Fig. 1 Early (<1000 GDD, solid bars), late (>1000 GDD, open bars), and total (solid and open bars combined) forage production in the spring of 1990, 1992, and 1993 for small grain cultivars interseeded into bermudagrass sod. Bars containing or followed by the same letter are not significantly different (P < 0.05) according to Duncan's test. Root mean square errors for early, late, and total production, respectively, were 0.24, 0.39, and 0.51 for 1990; 0.07, 0.29, and 0.33 for 1992; and 0.03, 0.52, and 0.53 for 1993