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Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)

Abstract

Growing-degree units were calculated for the North Central Region by using the so-called National Weather Service Method. This adjusts for maximum temperatures above 86°F and for minimum temperatures below 50°F. Growing-degree units were calculated for five different periods: 14 days before the average planting date to the average fall safe-from-frost date, 7 days before the average planting date to the average fall safe-from-frost date, the average planting date to the average fall safe-from-frost date, 7 days after the average planting date to the average fall safe-from-frost date, and 14 days after the average planting date to the average fall safe-from-frost date. Maps are shown giving the average growing-degree units for each of these periods. Also included are data for computing the number of growing-degree units that will be received with 10 different probability levels.

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