Abstract
Sludge derived from cow manure anaerobically digested to produce biogas (methane; CH4) was applied to maize (Zea mays L.) cultivated in a nutrient-low, alkaline, saline soil with electrolytic conductivity 9.4 dS m−1 and pH 9.3. Carbon dioxide (CO2) emission increased 3.1 times when sludge was applied to soil, 1.6 times when cultivated with maize and 3.5 times in sludge-amended maize cultivated soil compared to the unamended uncultivated soil (1.51 mg C kg−1 soil day−1). Nitrous oxide (N2O) emission from unamended soil was -0.0004 μg nitrogen (N) kg−1 soil day−1 and similar from soil cultivated with maize (0.27 μg N kg−1 soil day−1). Application of sludge increased the N2O emission to 4.59 μg N kg−1 soil day−1, but cultivating this soil reduced it to 2.42 μg N kg−1 soil day−1. It was found that application of anaerobic digested cow manure stimulated maize development in an alkaline saline soil and increased emissions of CO2 and N2O.
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