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Luo & D. W. Hamilton. Trans. ASAE 46(3): 797-803 - P-based land application of swine manure slurry results in under-application of nitrogen (N), while N-based application leads to over-application of P. This study compared three schemes of soluble orthophosphate (ortho-P) reduction from liquid swine nursery manure during batch aeration: (1) solids-liquid separation before aeration (pre-aeration solids-liquid, or PASL, separation), (2) solids-liquid separation in the middle of aeration (mid-aeration solids-liquid, or MASL, separation) and (3) no solids-liquid separation (control).