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Dep. of Soil, Water, and Climate, Univ. of Minnesota, 1991 Upper Buford Circle, St. Paul, MN 55108;
the West Central Exp. Stn., State Hwy. 329, Morris, MN 56267.
* Corresponding author (dginting{at}soils.umn.edu).
ABSTRACT
Application of manure on soils having high P test has raised concerns over the eutrophication of lakes and rivers. The objective of this study was to evaluate the effects of one time application of 164 kg P ha–1 from solid beef (Bos taurus L.) manure on soil Olsen P dynamics, P uptake by corn (Zea mays L.) grain, and P losses as total P (TP), particulate P (PP), and dissolved molybdate reactive P (DMRP) in both snowmelt and rainfall runoff under ridge tillage (RT) and moldboard plow (MP) systems from 1992 to 1994. Soil P was consistently higher in the manure than no manure treated plots (17.9 vs. 12.3 mg kg–1 in 1993 and 23.7 vs. 13.8 mg kg–1 in 1994). Phosphorus uptake was greater from the manure than no manure treated plots (24.5 vs. 19.8 kg ha–1 and 23.5 vs. 18.8 kg ha–1). Annual PP and TP losses were either similar or lower from manure than no manure treated plots. Particulate P losses by rainfall runoff were lower from the RT vs. MP systems (0.25 vs. 1.95 kg ha–1 in 1993 and 0.06 vs. 0.65 kg ha–1 and 1994). The opposite was apparent for DMRP losses in snowmelt, which were higher from the RT than MP system (0.11 vs. 0.01 kg ha–1 and 0.14 vs. 0.03 kg ha–1). The RT system is an environmentally better system than the MP system due to its substantial reduction in annual PP and TP losses.
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