Jonathan Smith, organic grower on St Martins, Isles of Scilly, talks about why he farms as he does and describes how he uses seaweed, compost and green manures to build soil organic matter and fertility. He touches on challenges he faces, treating the farm like an ecosystem; focusing on biodiversity, and explains how he has used the Farm Carbon Calculator to gain more detailed understanding of his farm and inform his practices. View the full farmer profile on the Agricology website.