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Summer Root Decline

Production and Mortality for Four Cultivars of Creeping Bentgrass

Dep. of Plant Sci. Rutgers Univ., New Brunswick, NJ 08901

View larger version (30K): [in a new window]   Fig. 1. Daily soil temperature at the 5-cm soil depth from June to October in 1997 and 1998. The dotted line indicates the optimal temperature for root growth (18°C).

View larger version (23K): [in a new window]   Fig. 2. Total root length for ‘L-93’, ‘Providence’, ‘Penncross’, and ‘Crenshaw’ in 1997 and 1998. Vertical bars on the bottom of the figure are LSD values (P = 0.05) for cultivar comparisons at a given day. The bar on the right side is for comparisons among dates for all four cultivars.

View larger version (23K): [in a new window]   Fig. 3. Total root number for ‘L-93’, ‘Providence’, ‘Penncross’, and ‘Crenshaw’ in 1997 and 1998. Vertical bars on the top of the figure are LSD values (P = 0.05) for cultivar comparisons at a given day. The bar on the right side is for comparisons among dates for all four cultivars.

View larger version (25K): [in a new window]   Fig. 4. Length of newly produced roots for ‘L-93’, ‘Providence’, ‘Penncross’, and ‘Crenshaw’ in 1997 and 1998. Vertical bars on the top or bottom of the figure are LSD values (P = 0.05) for cultivar comparisons at a given day. The bar on the right side is for comparisons among dates for all four cultivars.

View larger version (25K): [in a new window]   Fig. 5. Number of newly produced roots for ‘L-93’, ‘Providence’, ‘Penncross’, and ‘Crenshaw’ in 1997 and 1998. Vertical bars on the top of the figure are LSD values (P = 0.05) for cultivar comparisons at a given day. The bar on the right side is for comparisons among dates for all four cultivars.

View larger version (23K): [in a new window]   Fig. 6. Length of dead roots for ‘L-93’, ‘Providence’, ‘Penncross’, and ‘Crenshaw’ in 1997 and 1998. Vertical bars on the top of the figure are LSD values (P = 0.05) for cultivar comparisons at a given day. The bar on the right side is for comparisons among dates for all four cultivars.

View larger version (24K): [in a new window]   Fig. 7. Number of dead roots for ‘L-93’, ‘Providence’, ‘Penncross’, and ‘Crenshaw’ in 1997 and 1998. Vertical bars on the top of the figure are LSD values (P = 0.05) for cultivar comparisons at a given day. The bar on the right side is for comparisons among dates for all four cultivars.

View larger version (23K): [in a new window]   Fig. 8. Root mortality in length for ‘L-93’, ‘Providence’, ‘Penncross’, and ‘Crenshaw’ in 1997 and 1998. Vertical bars on the top of the figure are LSD values (P = 0.05) for cultivar comparisons at a given day. The bar on the right side is for comparisons among dates for all four cultivars.

View larger version (25K): [in a new window]   Fig. 9. Root mortality in number for ‘L-93’, ‘Providence’, ‘Penncross’, and ‘Crenshaw’ in 1997 and 1998. Vertical bars on the top of the figure are LSD values (P = 0.05) for cultivar comparisons at a given day. The bar on the right side is for comparisons among dates for all four cultivars.

View larger version (21K): [in a new window]   Fig. 10. Maximum rooting depth for ‘L-93’, ‘Providence’, ‘Penncross’, and ‘Crenshaw’ in 1997 and 1998. Vertical bars on the top are LSD value (P = 0.05) among four cultivars at a given day. The bar on the right side is for comparisons among dates for all four cultivars.