But the early trial results suggested companion crops could play a key role in the farm s sustainable rotation, which also uses spring cropping, appropriate tillage , farmyard manure and cover crops to encourage life in the soils and the margins. You cannot look at things in isolation, he said. We need to look at the whole rotation holistically, really looking at everything that makes that soil as healthy as it can be. For the companion crop, we were looking at that for CSFB to start with, but we are going to get all the benefits for the next crop, and the next crop.