Authors: Williams, PH Rowarth, JS Tregurtha, RJ

Citation: Ph. Williams et al., Uptake and residual value of N-15-labelled fertilizer applied to first andsecond year grass seed crops in New Zealand, J AGR SCI, 137, 2001, pp. 17-25

Authors: Williams, PH Rowarth, JS Tregurtha, RJ

Citation: Ph. Williams et al., Recovery of N-15-labelled fertiliser by a perennial ryegrass seed crop anda subsequent wheat crop, NUTR CYCL A, 56(2), 2000, pp. 117-123

Authors: Haynes, RJ Fraser, PM Tregurtha, RJ Piercy, JE

Citation: Rj. Haynes et al., Size and activity of the microbial biomass and N, S and P availability in earthworm casts derived from arable and pastoral soil and arable soil amended with plant residues, PEDOBIOLOG, 43(6), 1999, pp. 568-573