| http://www.w3.org/ns/prov#value | - The heat unit or degree-day concept, assuming that the growth or development is a linear function of the average temperature excess above some threshold, is analyzed and is shown to fail around some plant-specific optimum temperature of about 20??C. This is followed by a cursory and qualitative chapter on the possibilities of changing the micro-environment of plants, such as canopy structure a
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