Grass reference ET is defined as ''the rate of ET from a hypothetical reference crop with an assumed crop height of 0.08-0.12 m, a fixed surface resistance of 70sm~ , and an albedo of 0.23, closely resembling the ET from an extensive surface of green grass of uniform height, actively growing, well-watered, and completely shading the ground.'' In the grass reference ET definition, the grass is specifically defined as the reference crop and this crop is assumed to be free of water stress and diseases.
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