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Dairy Diet Impacts on Fecal Chemical Properties and Nitrogen Cycling in Soils

^a USDA-ARS U.S. Dairy Forage Research Center, Madison, WI 53706
^b Dep. Dairy Science, Univ. of Wisconsin, Madison, WI 53706
^c Louisiana State Univ. Agric. Center Southeast Research Station, Franklinton, LA 70438

View larger version (25K): [in a new window]   Fig. 1. Gross soil inorganic N in unamended soils.

View larger version (22K): [in a new window]   Fig. 2. Net inorganic N in soil amended with dairy feces from different diets.

View larger version (25K): [in a new window]   Fig. 3. Net inorganic N in soils amended with feces derived from alfalfa silage (AS), or corn silage (CS) diets fed at low (LP) or high (HP) crude protein levels.

View larger version (18K): [in a new window]   Fig. 4. Net inorganic N in Plano silt loam amended with feces from low (LP) or high (HP) crude protein diets (averaged across levels of AS and CS).

View larger version (24K): [in a new window]   Fig. 5. Net inorganic N in soils amended with feces derived from alfalfa hay (AH), alfalfa silage (AS), or corn silage (CS) diets.

View larger version (19K): [in a new window]   Fig. 6. Nitrogen uptake by sorghum in Plano, Loyal and Rosholt soils amended with feces from three feeding trials (within a soil type, sorghum, or sorghum ratoon, bars with different letters have significantly [P < 0.05] different N uptakes).

View larger version (17K): [in a new window]   Fig. 7. Plant yield and N uptake in soils (averaged across three soil types) amended with feces from alfalfa silage (AS) or corn silage (CS) diets (averaged across levels of dietary CP). (within a forage type, bars with different letters have significantly [P < 0.05] different DM or N uptakes).

View larger version (15K): [in a new window]   Fig. 8. Oat yield and N uptake in soils (averaged across three soil types) amended with feces from low (LCP) or high (HCP) crude protein diets (averaged across levels of dietary fiber). (bars with different letters have significantly [P < 0.05] different DM or N uptake).