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Abstract
The establishment of valid relationships between parameters of the physical environment and various crop parameters, both agronomic and physiological, forms a basis for crop management practices and possible crop simulation studies. It is essential, therefore, that any published relationships (generally regression equations) have general validity at least on a meso–scale.
Work on wheat in Canterbury, carried out at Lincoln College in 1971, putting forward relationships between ear water potential and soil moisture, solar radiation, and dew is, I believe, erroneous in the conclusions reached, and it would be unfortunate to have such conclusions perpetuated.