USDA measures coldness regarding plant cultivation by calculating the average absolute annual minimum temperature of a location over a period of time. Instead of this the American Horticulture Society (AHS) measures heat situation by calculating the average number of days per year with temperature above 30 degrees Celsius. Would it be reasonable and may be useful to evaluate heat situation by calculating the average of absolute maximum temperature and vice versa to measure coldness level by calculating the average number of days per year with minimum temperature under zero degree Celsius?
USDA's approach is in the right direction. I am not agreed to AHS approach. Please read my paper entitled "Screening lentil (Lens culinaris) for cold hardiness under controlled conditions"
Asghar Ali, D. L. JOHNSON , C. STUSHNOFF
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The Journal of Agricultural Science 10/1999; 133(03):313 - 319. · 2.88 Impact Factor
Thank you very much Asghar Ali. Could you suggest something for heat evaluation also.
Electrolyte leakage is an easy method of measuring cold hardiness. Its easy, cheap and can be used as the firstline for screening for frost hardiness
Dear David, the question here is what is the best way to measure cold hardiness zones from climatic point of view. Some methods are based on measuring the average extreme minimum of temperature some on the number of days with minimum temperature below zero and so on.
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