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Using Growing Degree Days to Predict Nitrogen Availability from Livestock Manures

^a Univ. of Maine, 495 College Ave., Orono, ME 04473-1294 USA
^b USDA-ARS, New England Plant Soil and Water Lab, Univ. of Maine, Orono, ME 04469-5753 USA

View larger version (23K): [in a new window]   Fig. 1 Effect of temperature on NO3 accumulation in soil amended with dairy manure as a single exponential function of (A) time and (B) growing degree days (GDD). Data points are mean of three observations; t is time in days after incorporation, and s.e.k is the standard error of regression parameter k

View larger version (23K): [in a new window]   Fig. 2 Nitrate accumulation in soil amended with beef, dairy, poultry, and swine manure as a function of growing degree days (GDD). Data points are mean of three observations; t is time in GDD after incorporation, and s.e.k is the standard error of regression parameter k

View larger version (20K): [in a new window]   Fig. 3 Effect of temperature on disappearance of NH4 in soil amended with dairy manure as a linear function of (A) time and (B) growing degree days (GDD). Data points are mean of three observations

View larger version (18K): [in a new window]   Fig. 4 Ammonium disappearance in soil amended with dairy, poultry, and swine manure as a function of growing degree days (GDD). Poultry and swine treatments are represented by combined regression. Data points are mean of three observations

View larger version (18K): [in a new window]   Fig. 5 Disappearance of manure NH4, as a percentage of manure NH4 input, from soil amended with dairy, poultry, and swine manure, as a function of growing degree days (GDD). Data points are mean of three observations

View larger version (15K): [in a new window]   Fig. 6 Organic N mineralized from swine manure at different temperatures, as a function of growing degree days. Data points are mean of three observations

View larger version (18K): [in a new window]   Fig. 7 Changes in inorganic N content (NO3 + NH4) in soil amended with swine manure between 0 and 600 growing degree days (GDD). Data points are mean of three observations