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Nighttime Evapotranspiration from Alfalfa and Cotton in a Semiarid Climate

USDA-ARS, Conservation and Production Research Lab., P.O. Drawer 10, Bushland, TX 79012

View larger version (25K): [in a new window]   Fig. 1. The mean nightly micrometeorological parameters of (A) vapor pressure deficit (VPD), (B) wind speed, (C) sensible heat flux, and (D) 2-m air temperature (Ta) for 1998 during the alfalfa growing season as measured at the SE lysimeter. The solid line represents the seasonal mean, and the dotted lines ±1 standard deviation.

View larger version (25K): [in a new window]   Fig. 2. The mean nightly micrometeorological parameters of (A) vapor pressure deficit (VPD), (B) wind speed, (C) sensible heat flux, and (D) 2-m air temperature (Ta) for 2001 during the cotton growing season as measured at the SE lysimeter. The solid line represents the seasonal mean, and the dotted lines ±1 standard deviation.

View larger version (20K): [in a new window]   Fig. 3. Measured nighttime evapotranspiration (ETN) of alfalfa measured at the NE and SE lysimeters which received the same irrigation amounts.

View larger version (23K): [in a new window]   Fig. 4. The measured nighttime evapotranspiration (ETN) of the NE (deficit-irrigated), SE (fully irrigated), NW (dryland), and SW(dryland) cotton crops.

View larger version (21K): [in a new window]   Fig. 5. The relationship of vapor pressure deficit (VPD) and nighttime evapotranspiration (ETN) for (A) alfalfa, (B) deficit-irrigated cotton on the NE lysimeter, (C) fully irrigated cotton on the SE lysimeter, and (D) dryland cotton on the west lysimeters.

View larger version (17K): [in a new window]   Fig. 6. The decoupling factor calculated for the alfalfa on the SE lysimeter, indicating values for nights with and without equilibrium evapotranspiration (ETeq) calculated using the McNaughton–Jarvis model.

View larger version (19K): [in a new window]   Fig. 7. The decoupling factor calculated for the fully irrigated cotton on the SE lysimeter, indicating values for nights with and without equilibrium evapotranspiration (ETeq) calculated using the McNaughton–Jarvis model.