Leicestershire farm's 20 years as 'research lab'
27 June 2012 Last updated at 11:12 BST
A farm in Leicestershire has been researching how to grow more crops without damaging the environment.
The Allerton Project, at Loddington, was set up in 1992 with the aim of maximising crop yields as well as protecting wildlife.
Quentin Rayner reports for East Midlands Today.