Only a third of wet-market stall holders claiming to sell organic products are selling certified goods, a survey has found. The Organic Resource Centre announced the findings yesterday after visiting 220 shops at 33 wet markets last month. The group urged consumers and sellers to learn more about organic goods and their certification to ensure their rights were protected. The survey found 16 per cent of wet-market stallholders claim they sell organic products, but only 37 per cent of those sell products certified by the centre or the Organic Certification Centre. More than three-quarters made their claims verbally, while the rest of the retailers displayed a sign reading 'organic'. Those selling non-certified products gave a variety of 'proof' for claiming that their goods were organic. For example, 27 per cent said they had reliable sources, 14 per cent said they could tell from the taste, 9 per cent said they knew from the appearance and 5 per cent said the products were grown in a greenhouse. The centre's director, Jonathan Wong Woon-chung, said the authenticity of products could not be tested in a laboratory, but required a visit to the farm to check criteria such as storage, the fertiliser and soil. He said the survey showed some retailers had the wrong idea about organic products and urged more education and certification. Professor Wong said consumers also needed to be educated because they were confused about what the term organic actually meant. The centre is organising its first organic sales and education programme on March 30 at Chater Garden to raise the public's understanding of organic products and certification. The Organic Resource Centre and the Organic Certification Centre are the two bodies that issue certification in the city. There are about 100 farms claiming to practise organic farming, of which 63 were certified by the Organic Resource Centre at the beginning of this year.