M. H. Johnson
Agricultural Research Service
30 Papers
261 Citations
M. H. Johnson is an academic researcher from Agricultural Research Service. The author has contributed to research in topics: Wastewater & Coastal plain. The author has an hindex of 16, co-authored 30 publications. Previous affiliations of M. H. Johnson include United States Department of Agriculture.
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Papers
Swine wastewater treatment by marsh–pond–marsh constructed wetlands under varying nitrogen loads
TL;DR: In this paper, the authors investigated the ability of marsh-pond-marsh (m-p-m) constructed wetlands to treat wastewater from a confined swine operation over varying nitrogen loads.
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Flow-proportional, time-composited, and grab sample estimation of nitrogen export from an eastern coastal plain watershed
TL;DR: In this article, the authors compared four methods of assessing stream water quality: time-composite sampling with continuous flow measurements, flow-proportional sampling with independent measurement of flow (FP), grab sampling with instantaneous flow measurements (IG), and grab sampling for quality assurance/quality control checks using daily USGS flow measurements.
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Impact of swine waste application on ground and stream water quality in an eastern Coastal Plain watershed
TL;DR: In this paper, a water quality project was initiated in Duplin County, North Carolina, in the 2044-ha Herrings Marsh Run watershed, where a swine farm within this monitored watershed expanded its operation from 3,300 to more than 14,000 animals.
Dissolved phosphorus retention and release from a coastal plain in-stream wetland.
TL;DR: It is concluded that for a time period, this in-stream wetland did provide DP retention and release, and during other time periods, DP was released due to changes in wetland area, rainfall, and DP concentrations.
Ammonia volatilization from marsh-pond-marsh constructed wetlands treating swine wastewater.
M. E. Poach,Patrick G. Hunt,G. B. Reddy,Kenneth C. Stone,T. A. Matheny,M. H. Johnson,E. J. Sadler +6 more
TL;DR: To minimize NH3 volatilization, continuous marsh systems should be preferred over marsh-pond-marsh systems for the treatment of wastewater from confined animal operations.
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