English: A Field of Oilseed Rape. The bright yellow flowers of Oilseed Rape have become a common sight in arable areas in the spring. As well as providing vegetable oil, this crop makes a good 'break crop', improving the soil for wheat or barley in the following years. Oilseed Rape cannot be grown frequently in any field due to the build up of diseases in the soil. This may change however if farmers are allowed to plant disease resistant genetically engineered crops.