Gary; I really do not have a answer. I do know that there is some connection.My son's farm is abot ten miles from a Mesonet site We watchec it very close and our first cutting time out with no irrigation. Now we watched close for the second cutting and when it reached 700 hour units it is being cut a second time at 21 days. Buds show but no flowers. It was irrigated and had rain. After cutting foliar fertilizer will be apply through irrigation. First cutting averaged three & half ton per acre. This cutting looks likr it will be close to that. Here are some links that explain Heat units. gitrig http://www.unce.unr.edu/publications/files/ag/other/fs9971.pdf
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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