Forage characteristics, steer performance, and water quality from bermudagrass pastures fertilized with two levels of nitrogen from swine lagoon effluent
January 1, 1996
Four 0.8-ha pastures of bermudagrass (Cynodon dactylon [L.] Pers.) were fertilized with either 456 or 873 kg/ha of nitrogen (N) from swine lagoon effluent (two replicates per treatment) and grazed by...
N-management and crop rotation effects on yield and residual soil nitrate levels
January 1, 1996
Swine production facilities are becoming more concentrated in Iowa, and public is concerned about the impact of using swine manure for crop production on soil and water quality. This field study was...
Environment - Air
Liquid balance model for swine waste management systems using single-stage anaerobic lagoons
January 1, 1996By Hector J. Cumba
The most important wastewater operation for farmers using lagoons to treat swine waste is maintaining the liquid level within the operational levels to avoid overflows and to satisfy the water demand...
Nitrification options for pig wastewater treatment
January 1, 1996By A. A. Szogi
Nitrification is a necessary and often limiting process in animal waste treatment for removal of nitrogen as N-2 through biological nitrification/denitrification systems. We evaluated three...
Environment - Manure Storage / Application
Manure incorporation equipment effects on odor, residue cover, and crop yield
January 1, 1996By H. M. Hanna
Field experiments in undisturbed (no-till) soyabean and maize residue were conducted to evaluate six liquid swine manure application/incorporation methods. The methods were injection with a...
A Simple Design and Operation for the Anaerobic Treatment of Highly Concentrated Swine Waste in the Tropics
January 1, 1995By P. Y. Yang
In order to develop a simple operation for an anaerobic treatment process for highly concentrated pig wastewater for small producers, a three-stage anaerobic treatment process was investigated. The...
Environment - Water Usage / Conservation
A method to evaluate appropriate nipple drinker flow rates for pigs
January 1, 1995By Peter A. Phillips
A method was developed for measuring how different water flow rates from nipple drinkers affect the actual rates of water intake and spillage by pigs. A combination of video and electronic techniques...
Removal of airborne swine dust by electrostatic precipitation
January 1, 1995
An electrostatic precipitator used in conjunction with a recirculation duct was developed to remove airborne pig dust from an environmental chamber. The collection efficiency of the precipitator was...
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...
