The Prince of Wales has campaigned on this subject, alongside the Soil Association, for seven years.

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The Soil Association believes the proposed new regulation will put the future of plant biodiversity at risk.

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The findings are being presented at a meeting on Thursday hosted by the Soil Association and Newcastle University.

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But Highland grower Agric Hadron and groups such as the Soil Association have concerns that the new legislation will outlaw traditional varieties.

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The Soil Association, a charity which sets organic standards, has warned that the future of the fledgling organic industry in Wales is under threat.

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The Soil Association says that gap should be six miles while other groups argue that, whatever the distance, it should be a legal requirement.

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Prince Charles, who is patron of the Soil Association and an avid supporter of "local sourcing initiatives" met year seven students taking part in a cookery lesson.

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But the Soil Association said the study was flawed.

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To be included, a study had to compare organic and conventional planting across similarly-sized areas, had to report on the sample size and error margins, and had to use organic methods that complied with the guidelines of certification organisations (such as the UK's Soil Association).

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