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Temporal Effects of Compost and Fertilizer Applications on Nitrogen Fertility of Golf Course Turfgrass

Dep. of Plant Pathology, The Ohio State Univ., 2021 Coffey Rd., Columbus, OH 43210

View larger version (30K): [in a new window]   Fig. 1. Effects of inorganic fertilizer treatments on clipping yields. Error bars represent standard error (n = 18). Dashed vertical lines represent dates of compost topdressing applications. Means are averaged across compost topdressing treatments. N fertilizer applied in 1997 for the low (LR), moderate (MR), and high (HR) rate treatments were 96, 192, and 394 kg N ha-1, respectively. N fertilizer applied in 1998 for the LR, MR, and HR treatments were 48, 96, and 192 kg N ha-1, respectively

View larger version (28K): [in a new window]   Fig. 2. Effects of compost topdressings on clipping yields. Error bars represent standard error (n = 18). Dashed vertical lines represent dates of compost topdressing applications. Means are averaged across treatments of inorganic fertilizer

View larger version (22K): [in a new window]   Fig. 3. Effects of inorganic fertilizer treatments on percent foliar N. Error bars represent standard error (n = 18). Dashed vertical lines represent dates of compost topdressing applications. Means are averaged across compost topdressing treatments. Nitrogen fertilizer applied in 1997 for the low (LR), moderate (MR), and high (HR) rate treatments were 96, 192, and 394 kg N ha-1, respectively. N fertilizer applied in 1998 and 1999 for the LR, MR and HR treatments were 48, 96, and 192 kg N ha-1, respectively. Significant inorganic fertilizer x compost topdressing interactions were observed only on 25% of the rating dates over the 3-yr study, and all of these occurred within 50 d after the May topdressing applications

View larger version (22K): [in a new window]   Fig. 4. Effects of compost topdressings on percent foliar N. Error bars represent standard error (n = 18). Dashed vertical lines represent dates of compost topdressing applications. Means are averaged across treatments of inorganic fertilizer. Significant inorganic fertilizer x compost topdressing interactions were observed only on 25% of the rating dates over the 3-yr study, and all of these occurred within 50 d after the May topdressing applications