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Effect of Drought on Growth, Carbohydrates, and Soil Water Use by Perennial Ryegrass, Tall Fescue, and White Clover

^a Agronomy Dep., 116 A.S.I. Building, The Pennsylvania State Univ., University Park, PA 16802
^b Dep. of Plants, Soils, and Biometerology, Utah State Univ., Logan, UT 84322-4820

View larger version (70K): [in a new window]   Fig. 1. (A) Total leaf dry mass per pot; (B) Ratio of leaf dry mass; droughted:irrigated plants. Wi indicates when irrigated plants (controls) were watered. Wd indicates when droughted plants were watered. Bars represent + S.E. Different bold letters (a, b, and c) indicate species means that were significantly different (P < 0.05) within each harvest date. Different italicized letters (a and b) indicate species means that were significantly different (P < 0.1) within each harvest date

View larger version (65K): [in a new window]   Fig. 2. (A) Stem base or stolon dry mass; (B) Ratio of stolon and stem base dry mass; droughted:irrigated plants. Wi indicates when irrigated plants (controls) were watered. Wd indicates when droughted plants were watered. Bars represent + S.E. Different bold letters (a and b) were significantly different within each harvest date, at P < 0.05. Different italicized letters (a and b) were significantly different within each harvest date at P < 0.1

View larger version (70K): [in a new window]   Fig. 3. (A) Storage carbohydrate concentrations, fructan plus starch; (B) Ratio of storage carbohydrates, fructan plus starch; droughted:irrigated plants. Wi indicates when irrigated plants (controls) were watered. Wd indicates when droughted plants were watered. Bars represent + S.E. Different bold letters (a and b) indicate means that were significantly different (P < 0.05) within each harvest date. Different italicized letters (a and b) indicate means that were significantly different (P < 0.1) within each harvest date

View larger version (31K): [in a new window]   Fig. 4. Degree of polymerization of fructans. Bars represent + S.E. Wi indiacates when irrigated plants (controls) were watered. Wd indicates when droughted plants were watered

View larger version (61K): [in a new window]   Fig. 5. (A) Total simple sugars concentrations, glucose and fructose; (B) Ratio of simple sugars; droughted:irrigated plants. Wi indicates when irrigated plants (controls) were watered. Wd indicates when droughted plants were watered. Bars represent + S.E. Different bold letters (a and b) indicate means that were significantly different (P < 0.05) within each harvest date