Feedpea, oat and triticale were evaluated in monoculture and intercropped together, as green manures and as green forages under organic management. Growing crops with the intention of ploughing them into the soil for supplying nutrients to a subsequent crop is an integral part of sustainable organic management. However, this green manure year represents a year where the farmer does not receive any direct economic benefit from this land. This study was initiated, in part, to determine if a green forage crop might enable the farmer to gain some economic benefit without compromising the fertility of the soil. The pea/cereal intercropped treatments were evaluated to determine if the presence of a cereal extracting N from the soil stimulates the legume to fix N more efficiently. The green forage crops were harvested in the early grain filling stage, approximately 4 to 6 weeks before the grain would typically be harvested from a mature crop. Despite this early harvest, all of the green forage treatments extracted considerable amounts of nutrients (N and P) from the soil. The comparable green manure treatments were ploughed under approximately four weeks before the green forages were harvested. During this four week period, the green forages accumulated more than twice as much N and P in their biomass, compared to the green manures. Consequently, wheat grown the year after the green manure and green forage treatments produced highest yields and extracted the most N and P from the green manure treatments. Field pea grown as a plough-down crop was the most effective at supplying N and P to the subsequent crop.