Liquid swine manure application to forage soil: effect on soil carbon and economic returns
Hog production has been on the increase in Saskatchewan for the past several years. This has lead to an increase in the environmental interest surrounding the application of liquid hog manure. The expected increase in swine production operations will lead to an increase in demand for suitable land area to properly dispose of this effluent within the economic transport distance of the collection site. Soil injection of liquid swine effluent into forage crops will produce two types of benefits: increased forage crop production and an increase in soil carbon. A three-year study was conducted to determine the effects on injecting different rates of swine effluent into three types of forage crops: alfalfa, Russian Wild Rye and brome-alfalfa The effluent treated plots were sampled to determine if there has been any significant increases in soil carbon compared to untreated control plots. The economic distance which hog manure can be transported depends on the cost of transport and application and the short-term returns to be realized from the additional yield produced by the fertilizing effect of the manure. Results showed that the yearly application of the low rate of liquid hog manure into the brome/alfalfa forage crop produced the greatest net return to the forage grower.
soil organic carbon
light fraction organic carbon
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