This study compared N, P, and K concentrations in soils that received injected dairy manure and broadcast inorganic fertilizers for 3 years. Nitrogen from manure and inorganic fertilizer was applied at approximately 84, 168, and 252 kg N ha** minus **1yr** minus **1 in 1982 through 1984. Inorganic P and K fertilizers were applied to match the application rates for expected available P and K in the manure. Corn (Zea mays L. ) was grown on treatment plots in 1982 through 1985 at three locations in south-central Wisconsin. Silage and grain yield, nutrient uptake, and soil N, P, and K concentrations were determined. More total inorganic N in the soil profile and faster downward movement were found under the fertilizer treatments than the manure treatments. Greater loss of manure N from denitrification is suggested for this difference. The additional organic nutrient components of the manure resulted in more total N, P, and K applied than that applied from the inorganic fertilizer. Additional study results are discussed.
|Original language||English (US)|
|Number of pages||6|
|Journal||Transactions of the American Society of Agricultural Engineers|
|State||Published - Sep 1 1987|
ASJC Scopus subject areas
- Agricultural and Biological Sciences (miscellaneous)