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Clipping Management and Nitrogen Fertilization of Turfgrass

Growth, Nitrogen Utilization, and Quality

^a Dep. of Plants, Soils, and Biometeorology, Utah State Univ., 4820 Old Main Hill, Logan, UT 84322-4820
^b Dep. of Plant Science, Univ. of Connecticut, 1376 Storrs Road, U-4067, Storrs, CT 06269-4067

View larger version (30K): [in a new window]   Fig. 1. Dry matter yield (A, B), N uptake (C, D), apparent N recovery (E, F), and N use efficiency (G, H) responses across N rates at the Research Farm and Spring Manor Farm sites. Vertical bars represent standard errors of the means.

View larger version (46K): [in a new window]   Fig. 2. Tissue N concentration response of turfgrass during five harvest periods at the Research Farm 1998 (A, B) and 1999 (C, D), and Spring Manor Farm 1998 (E, F) and 1999 (G, H). Harvest periods correspond approximately to months (1 = May/June, 5 = Oct.). Arrows indicate dates of fertilization. The first fertilization occurred before the first harvest period.

View larger version (42K): [in a new window]   Fig. 3. Quality response of turfgrass during seven different rating periods (monthly) at the Research Farm 1998 (A, B) and 1999 (C, D), and Spring Manor Farm 1998 (E, F) and 1999 (G, H). Rating periods correspond to months (1 = May, 7 = Nov.) and arrows indicate dates of fertilization. Dashed lines indicate the acceptable quality rating of 6.