Nodules on the roots of peas and beans help the plant to secure its own nitrogen, reducing the need for artificial fertiliser. Professor Giles Oldroyd's group is researching how this could be ...

IN addition to the red pigment, hæmoglobin,· we have always found in leguminous root nodules a brown pigment. This is methæmoglobin with trivalent iron1. The simplest way of demonstrating its ...