Environment

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Prairie Swine Centre is an affiliate of the University of Saskatchewan


Prairie Swine Centre is grateful for the assistance of the George Morris Centre in developing the economics portion of Pork Insight.

Financial support for the Enterprise Model Project and Pork Insight has been provided by:



Author(s): Evans, R.O., P.W. Westerman, (1) and M.R. Overcash (2)
Publication Date: January 1, 1984
Reference: Transactions of ASAE. V:27(2): 473-480.
Country: United States

Summary:

The rates used for this experiment are very high and were selected with the idea to verify the long-term effect of manure disposal as opposed to valorization and optimization. In this experiment, the runoff represented less than 1% and the subsurface drainage 25% of the annual water input. The application rates of 325, 650 and 1300 kg N/ha – year represent 1 time, 2 and 4 times the recommended application rate for Coastal bermudagrass. Both the medium and the high rates resulted in nitrate concentration in the water higher than the recommended level of 10 mg/L. P accumulation in the soil resulted from the N application at N recommended rate. Considering N as the element to set the application rate, P recommended rate was exceeded by 3 times. P was fixed by the soil, however by the fifth year of the experiment, higher P concentrations were measured in the runoff. Even if many years are necessary before seeing P leaching, P should be considered to determine the application rates as well as N.

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