Presentations at Conferences 1994 Research Report (Metabolism of CPPU) presented at NZSHS Conference 1999 Effects of silicates in hydroponic production, AHA Conference Adelaide Australia 2000 Effects of Silicates, HMA Conference Vancouver Canada 2000 Hydroponic Nutrient Formulation, HSA Conference Los Angeles USA 2000 Nutron Software Workshops Unitec Auckland New Zealand, Lismore Australia, Sydney Australia 2001 Organic Hydroponics, AHGA Conference Gosford Australia 2001 Commercial Pepper Production, CropKing Conference Orlando Florida. 2002, 2004 and 2006 Commercial Strawberry Production, Hydroponic Pepper Production, NFT Lettuce production, Orchid and Anthurium Production, Mexican Hydroponic Association, Toluca Mexico. 2003 The effect of pyrophyllitic clay suspension on salinity tolerance of tomato in NFT, South Pacific Soilless Culture Conference, Massey University (ISHS Symposium) Organising committee for the South Pacific Soilless Culture conference February 2003 2004 Urban Agriculture conference, Brisbane Australia2004 Whitefly control discussion panel, NZ Horticulture Industry Conference, Christchurch