Growing Degree Days
 A & L  Canada  Laboratories Inc.
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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.
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Growing degree days data 2017 Alfalfa Grass Date GDD Protein ADF NDF Lignin Protein ADF NDF Lignin Apr-27 132 28.20 17.10 20.70 3.00 18.60 21.40 35.90 2.20 May-10 175 25.50 17.50 22.00 4.40 12.90 22.40 40.10 1.10 May-15 219 24.20 20.00 26.00 3.90 15.20 25.00 44.40 2.30 May-18 237 24.10 24.20 27.30 3.50 13.70 30.60 49.60 2.00 May-22 276 23.22 24.38 30.33 5.06 13.36 31.02 55.79 2.52 May-25 306 22.35 29.68 36.59 5.54 12.66 33.80 53.52 3.19 May-29 347 22.72 31.29 36.97 5.85 13.81 33.99 54.17 4.25 Jun-01 373 21.15 29.93 39.70 6.00 10.52 34.07 56.08 4.55