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1998
Using nitrogen fertiliser to increase dairy farm profitability, JM, McGrath, JW Penno, KA MacDonald, and WA Carter , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 58, p.117-120, (1998)
1995
Effect of nitrogen fertiliser and summer rotation length on milk production in a dry Waikato summer., JW, Penno, AM Bryant, WA Carter, and KA MacDonald , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 55, p.64-66, (1995)