SUNRAYSIA citrus grower Matthew Cottrell has become a casebook study for a NSW Department of Primary Industry research project on high-density plantings across the industry.

As well as citrus, Mr Cottrell and his family also produce wine and table grapes on their 230ha at Nangiloc, where their citrus orchards include a range of early, mid, and late navels, as well as seeded daisy and tangold mand...