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. Evapotranspiration model description The application of ET model relies on the availability of data, which is limited by the measurement equipment, expertise, climate, and historical data. Therefore, models reported in previous studies with fewer inputs and better

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). Early work by Burger et al. (1987 ) and Regan (1997) calculated crop coefficients (Kc) to relate woody plant actual ET A to Penman-Montieth-based reference evapotranspiration. However, these Kcs were based on a fixed value of container surface area

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further developed by the other researchers ( Allen et al., 1998 ; Burman et al., 1980a , 1980b ; Doorenbos and Pruitt, 1977 ). K C is the ratio of the evapotranspiration of the crop (ET C ) to a reference crop (ET O ) ( Allen et al., 1998 ). ET O may

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estimating ET A of container-grown woody ornamental plants as a basis for precision irrigation. Based on the relationships of ET A , potential evapotranspiration (ET O ), and projected canopy area (PCA) of a given species, a water need index (WNI) or plant

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not included in the overall analysis of irrigation and runoff during the two experiments. Irrigation, evapotranspiration, and plant capture factor. Plants were irrigated predawn (usually at 0500 hr ) with either a fixed rate of 1 cm·d −1 of water (1

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Abbreviations: ET, evapotranspiration; ψ, water potential; VPD, vapor pressure deficit. 1 UC Cooperative Extension, 733 County Center III Court, Modesto, CA 95355. This work supported in part by a grant from the California Prune Board. The cost of

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and to quantify how ABA affects the time to wilting. The objectives of the second study were to examine the short-term effects of ABA drenches on g S , E, and P n of tomato. Materials and Methods Evapotranspiration and shelf life. Tomatoes

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water. Meteorological equations such as the modified Food and Agriculture Organization of the United Nations (FAO) Penman-Monteith equation ( Allen et al., 1998 ) are used to schedule irrigation needs by calculating reference evapotranspiration from

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had the highest cumulative volume of effluent compared with the C, PF, and ST treatments. However, no significant differences in leachate volumes were seen among the treatments. Fig. 1. Cumulative volume of effluent ( A ) and evapotranspiration ( B

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The American Horticulture Society (AHS) Heat Zone categories have been developed to categorize ornamental plant adaptability to different air temperature climates. These zones, like the Plant Hardiness map showing plant cold hardiness zones within the United States, are primarily north to south zones. Within the Great Plains region of the United States, the AHS Heat Zone categories provide a basic level of plant adaptability to air temperature, but do not account for plant reaction to variations in wind, relative humidity or sunlight. Daily reference evapotranspiration provides a single number that responds to variations in air temperature, wind, relative humidity and sunlight. In Oklahoma, the Oklahoma Mesonet provides a uniform statewide network of weather monitor towers that can be used to accurately calculate both short and tall American Society of Civil Engineers (ASCE) reference evapotranspiration (ref ET) across the entire state. Accumulated daily ref ET values can be used to provide further refinement in categorizing ornamental plant adaptability.

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