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Effect of Defoliation Severity on Regrowth and Nutritive Value of Perennial Ryegrass Dominant Swards

^a Dexcel Limited, Private Bag 3221, Hamilton 2020, New Zealand
^b Tasmanian Inst. of Agric. Res., Univ. of Tasmania, P.O. Box 3523, Burnie 7320, Tasmania, Australia

View larger version (17K): [in this window] [in a new window]   Fig. 1. Total water-soluble carbohydrate (WSC) content remaining in the residual stubble of the (a) plant and (b) individual tiller following defoliation to 20, 40, 60, 80, or 100 mm residual stubble height (RSH) over seven sequential harvests. Data presented are averages from the fourth and seventh harvests (n = 10) for each RSH. The standard error of the difference was (a) 21.8 mg plant–1 and (b) 1.16 mg tiller–1.

View larger version (13K): [in this window] [in a new window]   Fig. 2. The quadratic relationship between water-soluble carbohydrate (WSC) content (mg tiller–1; H4) and subsequent herbage yield (kg DM ha–1; H5) following defoliation to 20 (filled circle), 40 (open circle), 60 (filled triangle), 80 (open square), or 100 mm (filled square) residual stubble height over seven sequential harvests. Each data point indicates an individual replicate. The standard error was 412 kg DM ha–1.