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Sommerfeldt T.G., Chang C., Entz T. Long-term annual manure applications increase soil organic matter and nitrogen, and decrease carbon to nitrogen ratio. Soil Sci. Soc. Am. J. 52:1988;1668-1672.
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(1988)
Soil Sci. Soc. Am. J.
, vol.52
, pp. 1668-1672
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Sommerfeldt, T.G.1
Chang, C.2
Entz, T.3
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