ARS | Publication request: TURNOVER OF DAIRY MANURE N FRACTIONS IN SOIL

Submitted to: American Society of Agronomy Meetings
Publication Type: Abstract Only
Publication Acceptance Date: November 9, 2000
Publication Date: N/A

Technical Abstract: Nitrogen excretion in dairy manure can be divided into three pools: urinary N (UN), fecal endogenous N of microbial and gut origin (FEN), and fecal undigested feed N (FUFN). Each pool of manure N has a different potential to be recycled after its application to crop land. The rate and extent of manure N recycling depends on soil physical and chemical properties and the relative proportion of each manure component. Each of the manure components (UN, FEN, and FUFN) was labeled with 15N and applied in equivalents of 0 and 160 kg/ha of available N to 16 prominent agricultural soils of Wisconsin (four silt loams, four loams, four sandy loams, and four sands) of various fertility levels within a textural class. The soil manure mixtures were incubated at constant temperature and moisture, and sampled at weekly intervals for 24 wk. Data on N mineralization rates (k) and cumulative manure N mineralization (Nmin) of each manure N component were determined and related to soil properties.