Landscape Management, November 2016
key eT Evapotranspiration eTo Reference ET for a short crop usually clipped grass kv Factor for vegetation type kd Factor for plant density ks Factor for plant water stress ke Factor for evaporation from wet surfaces both soil and plant kmc Factor for microclimate THE PREMIER CHOICE WIL GRO A Dry Fertilizer ili Leading di Line i Up WIL GRO is a premier product line of dry granular nutritional products designed specifically for professional turf and ornamental markets WIL GRO contains uniformly sized materials which can be blended with other controlled release nutrients micronutrients value added and plant vigor ingredients in a process that includes screening and dust reduction to meet quality assurance standards Contact your local Wilbur Ellis representative and ask how WIL GRO fertilizer can help your operation thrive November 2016 LANDSCAPeMANAGeMeNT NeT 43 the shading area of the ground The value which can be measured directly will range from 0 to 1 with 1 being when 70 to 80 percent or more of the ground is shaded at midday 4 Factor For Plant Water StreSS Ks This component is determined by the amount of soil moisture depletion so youll need to determine the root zone depth plant available water per inch depth and the fraction of water that can be extracted without plant stress p The p variable ranges slightly from 04 annuals and cool season turfgrass to 06 trees and shrubs Heres how to determine Ks TAW total available water depletion root zone 1 p x TAW 5 Factor For evaPoration Ke This number can jump to 135 following wetting events both rain and irrigation Roots typically grow during the spring so dont short them of water during that season Adjust the watering amounts slowly so the roots dont get stressed Also dont just increase irrigation runtimes and frequencies to fix problems That approach can increase evaporation from wet surfaces and make more gallons necessary to avoid stress Instead you need to identify and implement the correct solution for the specific landscape Remember Whatever level you water to will become your new root zone 6 Factor For MicrocliMate Kmc It will increase during harsh conditions like direct sunlight near pavement reflective windows and windy conditions Shade being shielded from wind and areas away from hot or dry surfaces will decrease this factor This factor needs to be adjusted to match the sites conditions Dowdle is a freelance writer based in Nashville pro wilburellis com For information only Not a label Prior to use always read and follow the product label directions WILBUR ELLIS logo Ideas to Grow With and WIL GRO are registered trademarks of Wilbur Ellis Company LLC K 0916 065
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