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    Crop water stress index calculator (CWSI)  
    crop=   Red Plume  
     
    Inputs    
       
    Air Temperature degree C , Ta    
    Relative Humidity    
    Plant canopy temperature degree C, Tc    
    Slope of base line degree C kPa-1    
    Intercept of Base line degree C    
    Temperature of upper base line (Tc-Ta) degree C    
     
    Calculations  
    Saturated vapor pressure kPa    
    Vapor pressure deficit , kPa    
    Tc-Ta degree C    
    Tc-Ta -upper base line degree C    
    Uppor temperature- lower base line degree C    
    CWSI= relative distance of measured vs calculated    
    between lower and upper base line  
     
    CROP WATER STRESS INDEX BASE LINE for Selected Crops  
     
    TABLE 1. Results of the linear regression of canopy - air temperature and vapor pressure deficit.  
      Scientific   Slope Intercept  
    Name Name Obs# degree C kPa-1 degree C  
       
     
    Alfalfa Medicago Sativa, L.   -1.93 0.96  
    Pecan Carya illinoensis 27 -0.606 0.429  
    Red Leaf Plum Prunus cerasifera 19 -1.14 1.05  
    Mulberry Morus alba 30 -0.423 0.332  
    Honey Locust Gleditsia triachanthos  
    inermis   26 -0.972 0.947  
    Modesto Ash Fraxinus velutina glabra 12 -2.02 2.36  
    Redbud Cercis canadensis 16 -1.39 1.77  
    Bolleana Poplar Populus alba Pyramidalis' 8 1.98 2.69  
    Vitex Vitex angus-castus 25 -0.96 1.56  
    Salt Cedar Tamarix gallica 29 -0.712 1.55  
    Sycamore Platanus acerifolia 11 -0.772 1.99  
    Ash Fraxinus 29 -0.0712 1.55  
    Aleppo Pine Pinus halepensis 25 -0.949 2.22  
    Rosemary Rosemarinus officinalis 23 -1.41 3.63  
    Mimosa Albizia julibrissin 25 -0.377 1.01  
    Atlas Cedar Cedrus atlantica 30 -0.604 1.6  
    Afghan Pine Pinuse eldarica 23 -0.666 2.47  
    Hollywood Juniper Juniperus chinensis  
      Tolurosa' 30 -0.543 2.02  
    Barberry Berberis mentorensis 19 -0.906 6.61  
     
    The upper base line can be set at 4 degrees C for early summer temperatures  
    and 6 degress C for maximum summer temperatures as the estimate  
    of the temperature of non transpirating vegetation.  
       
       
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