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  • Feed-milk-manure nitrogen relationships in global dairy production systems 

    Powell JM; Macleod M; Vellinga TV; Opio C; Falcucci A; Tempio G; Steinfeld H; Gerber P (2013)
    Nitrogen (N) inputs from fertilizer, biologically-fixed N, feed, and animal manure sustain productive agriculture. Agricultural systems are limited however in their ability to incorporate N into products, and environmental ...