The effects of sample size, temperature and duration of storage on the soluble nitrogen and phosphorus content of pig slurry were determined. Almost total conversion of soluble nitrogen to ammonia was observed during storage with considerable losses of dissolved ammonia during filtration procedures under alkaline conditions. Phosphorus was associated mainly with the fine particulate matter of the slurry. The interconversion of insoluble to soluble phosphorus appeared to be an anaerobic process. The rates of production of ammonia and soluble phosphorus were increased at higher temperatures. Changes in small storage samples (< 500 cm 3 ) did not reflect the changes likely to occur under normal farm storage conditions.
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McGill et al. (1976) studied this question.