Graduate Thesis Or Dissertation
 

Nutrients in runoff from spray irrigation of swine wastes

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/dr26z080q

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  • Major emphasis of this research study involved the evaluation of nutrient transport by overland flow. Samples gathered at various distances relative to a swine-waste spray irrigation system were used for the nutrient evaluation. As a result of this study, the following conclusions are made: 1. It is improbable that the spray irrigation system contributes to the nutrient content of Oak Creek. 2. In nearly all cases the nutrient concentration at station 2 was nearer that of the two control stations (3 and 4) than to that of the freshly applied waste at station 1. 3. The applied liquid waste for the most part was absorbed by the soil prior to reaching station 2 (150 feet down slope from the nozzles). Only prolonged high-intensity rainfall, in addition to spraying, would cause liquid accumulation behind dam number two (station 2). The only agent causing a reservoir at stations 3 and 4 was rainfall. 4. The soil does not appear to be overloaded since the pasture cover crop flourishes. During the rainy season the grass within the "throw" of the sprinklers is higher than that in the surrounding area, while in summer the same grass is shorter and appears burned. Although growth is somewhat inhibited during the dry season, application of toxic or inhibitory matter has not been great enough to destroy the grass or cause cattle to reject it for grazing.
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  • File scanned at 300 ppi (Monochrome) using Capture Perfect 3.0 on a Canon DR-9050C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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