Manure-Phosphorus in Soil: Detection and Mobility of Phytate
January 1, 1996
Annual swine effluent application in western Oklahoma for 11 consecutive years did not lead to significant accumulation of soil phosphorus. Similar trend was shown in a century-old field experiment...
Reduction of odor and volatile substances in pig slurries by using pit additives
January 1, 1996
The effects of five commercial pit additive products on the release of odour nuisance and volatile compounds from swine manure were examined. The changes of pH, volatile fatty acids, total solids,...
An Integrated Index of Electrical Energy Use in Canadian Agriculture with Implications for Greenhouse Gas Emissions
January 1, 1996By J.A. Dyer
Electricity is fundamental to many farm chores. In this paper quantitative indices of electrical energy use were developed which reflect direct on-farm decisions for measures that farmers can adopt...
Evaluating the use of straw and other floating materials to control odor and gases from pig manure storage units
January 1, 1996
The use of various floating covers on commercial manure storage units to control odour and H2S emissions was evaluated and the management requirements to maintain the covers were identified. When...
Removal of nitrogen from swine manure wastewaters by ammonia stripping
January 1, 1995
Laboratory-scale experiments were undertaken to investigate aeration and air stripping as methods for removing ammonia from swine waste waters with high nitrogen contents. The effects of temperature,...
Effects of swine lagoon effluent relative to commercial fertilizer applications on warm-season forage nutritive value
January 1, 1995By A. Adeli
Two field experiments were conducted to evaluate the effects of comparable rates of swine lagoon effluent and commercial fertilizer at different harvest dates on dry matter yield and nutritive value...
Evaluation of nitrogen isotopes as indicators of nitrate contamination sources in an agricultural watershed
January 1, 1995
Determining the relative contributions of nitrate contamination in agricultural watersheds characterized by applications of both mineral and animal waste nitrogen to fields is important in...
Mathematical Modeling of Phosphorus Losses from Land Application of Hog and Cattle Manure
January 1, 1995By R. F. Grant
Mathematical models may provide a means to estimate phosphorus (P) losses from land application of manure. Phosphorus losses typically occur during brief episodes of runoff and erosion. Models must...
Modeling the effects of diet formulation on nitrogen and phosphorus excretion in swine waste
January 1, 1995
Two weight classes of growing-finishing swine were fed corn-soybean diets lower in protein and phosphorus to determine the reduction in nitrogen (N) and phosphorus (P) in swine waste when compared to...
Simulated and measured effect of rectangular obstructions on carbon dioxide gas dispersion in a scaled swine building
January 1, 1995By S. J. Hoff
Gas dispersion from shallow manure storage pits was experimentally measured and mathematically modeled in a 1:6-scale ventilation chamber. The chamber represents a geometrically scaled model of a...
