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Effects of High Temperature and Drought on a Hybrid Bluegrass Compared with Kentucky Bluegrass and Tall Fescue

Dep. of Horticulture, Forestry & Recreation Resources, 2021 Throckmorton Hall, Kansas State Univ., Manhattan, KS 66506. Contribution no. 07-185-J from the Kansas Agric. Exp. Station

View larger version (22K): [in this window] [in a new window]   Figure 1. Effects on visual quality rated on a scale of 1 to 9 (1 = poorest and 9 = highest) of (A) high temperature, (B) drought, (C) high temperature and drought, and (D) control in Kentucky bluegrass (KBG), hybrid bluegrass (HBG), and tall fescue (TF). Symbols along the abscissa of each graph indicate significant differences (P = 0.05) between HBG and KBG (*), HBG and TF (+), and KBG and TF (x), on a given day after treatment initiation (days of treatment).

View larger version (27K): [in this window] [in a new window]   Figure 2. Effects on cumulative gross photosynthesis (P) of high temperature, drought, high temperature and drought, and control in Kentucky bluegrass (KBG), hybrid bluegrass (HBG), and tall fescue (TF). Means with the same letters were not significantly different (P = 0.05).

View larger version (15K): [in this window] [in a new window]   Figure 3. Effects on gross photosynthesis (P) of high temperature in Kentucky bluegrass (KBG), hybrid bluegrass (HBG), and tall fescue (TF). Symbols along the abscissa indicate significant differences (P = 0.05) between HBG and KBG (*), and HBG and TF (+) on a given day after treatment initiation (days of treatment).

View larger version (22K): [in this window] [in a new window]   Figure 4. Effects on electrolyte leakage (EL) of (A) high temperature, (B) drought, (C) high temperature and drought, and (D) control in Kentucky bluegrass (KBG), hybrid bluegrass (HBG), and tall fescue (TF). Symbols along the abscissa of each graph indicate significant differences (P = 0.05) between HBG and KBG (*), and HBG and TF (+) on a given day after treatment initiation (days of treatment).

View larger version (20K): [in this window] [in a new window]   Figure 5. Effects on cumulative dry matter production of high temperature, drought, high temperature and drought, and control in Kentucky bluegrass (KBG), hybrid bluegrass (HBG), and tall fescue (TF). Means with the same letters were not significantly different (P = 0.05).

View larger version (28K): [in this window] [in a new window]   Figure 6. Effects on (A) cumulative evapotranspiration (ET) (mm); (B) green leaf area index (LAI); and (C) degree-hours at the soil surface in high temperature, drought, high temperature and drought, and control treatments in Kentucky bluegrass (KBG), hybrid bluegrass (HBG), and tall fescue (TF). Means with the same letters in each graph were not significantly different (P = 0.05).