Institution: | Agricultural Development and Advisory Service, Harpenden Laboratory, Hatching Green, Harpenden AL5 2BD, U.K.;Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, U.K.;Broom's Barn Experimental Station, Higham, Burv St Edmunds IP28 6NP, U.K.;Agricultural Development and Advisory Service, Brooklands Avenue, Cambridge CB2 2DR, U.K. |