Growing Degree Days
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                                                                                                                                                                    Growing Degree Days is a measurement of the accumulation of heat based on mean daily temperature above 5 C. There is  a correlation between growing degree days and plant maturity. By tracking the feed analysis (Protein, ADF, NDF, Lignin, RFV) and growing degree days we can estimate the optimum harvest date of a forage crop. Growing Degree Days versus Forage Quality 2016                                             Woodstock, Ontario
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Alfalfa Grass Date GDD  Protein ADF NDF Lignin Protein ADF NDF Lignin from  degree C May - 04 90.0 29.2 16.9 20.5 2.8 17.8 21.3 40.8 1.0 May - 08 130.0 28.3 18.9 22.2 3.1 15.3 21.0 40.3 1.1 May - 09 134.0 29.5 19.6 24.1 3.8 18.9 22.9 39.6 1.8 May - 10 137.4 26.5 18.3 21.4 6.6 17.2 24.8 43.0 1.1 May - 12 154.2 28.2 17.8 24.1 4.1 15.2 21.7 42.8 1.4 May - 15 178.0 27.7 20.9 27.6 4.9 19.2 25.3 43.4 2.0 May - 19 197.0 24.1 22.6 26.8 5.3 12.0 28.4 48.9 2.0 May - 20 204.0 27.8 21.7 28.4 4.8 no grass in this field May - 24 247.0 23.2 25.8 31.0 5.0 16.8 30.1 52.7 4.0 May - 24 247.0 23.9 24.2 33.8 4.6 composite sample Listowel area mostly alfalfa 247.0 20.3 23.1 36.2 4.0 composite sample Listowel area grass - alfalfa mix 247.0 24.6 20.4 29.6 5.0 composite sample Seaforth area mostly alfalfa