WHAT IS “HEAT SUMMATION”, WHY IS IT IMPORTANT & HOW DO I CALCULATE MY “HEAT INDEX” OR “HEAT SUMMATIONS UNITS” (HSU)?
The length of the growing season (as discussed above) is not the only important measure of a potential site. Of equal importance is the overall heat index which accumulates during the growing season. Since the rate of metabolism & growth of a vine will be generally faster under warmer conditions, it is not only necessary for a vine to be planted in a site with an appropriately long growing season, but the accumulation of heat throughout that season must be enough to allow the vine to ripen. The “heat summation units” for a site is obtained by totaling the number of degrees above 50F (10C) for the entire growing season. It can be calculated (on the F scale) for your location as follows: 1. Contact the National Weather Service reporting station closest to your vineyard (it is probably at the nearest large airport). 2. Ask them for the average low & high temperature for each month (if you are really neurotic about this stuff [like me] you can get the info _by day_, but monthly figures wil
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