Nutrient management science : state of knowledge, use and uptake in New Zealand / prepared for the Ministry for Primary Industries by the Soil and Land Use Alliance ; lead authors: T. Payn, M. Beare, M. Shepherd, K. Bayne ; contributing authors: N. Botha, A. Collins, D. Curtin, M. Davis, P. Fraser, C. Hedley, C. Hoogendoom, P. Johnstone, G. Lucci, R. Parfitt, J. Xue.