1. Dairy farming systems based on efficient nutrient management;Aarts;Neth. J. Agric. Sci.,1992
2. Heterogeneity of soil mineral nitrogen in pasture grazed by cattle;Afzal;Soil Sci. Soc. Am. J.,1992
3. Nitrate pollution of ground water in the Waikato region;Baber;J. N.Z. Inst. Chem.,1972
4. Nitrogen balances in intensively managed pasture systems;Ball,1982
5. Nitrogen relationships in intensively managed temperate grasslands;Ball;Plant Soil,1984