BIOLOGICAL NITROGEN-FIXATION IN UPLAND AND MARGINAL AREAS OF THE UK

[51] Thomson D. J., 1979, BR GRASSL SOC OCCAS, V10, P101

[52] Vallis I., 1978, Plant relations in pastures., P190

[53] WEDDERBURN ME, 1980, THESIS U GLASGOW

[54] 1979, SCI HILL FARMING 25

[55] 1972, NSCA9 N SCOTL COLL A

[51] Thomson D. J., 1979, BR GRASSL SOC OCCAS, V10, P101

[52] Vallis I., 1978, Plant relations in pastures., P190

[53] WEDDERBURN ME, 1980, THESIS U GLASGOW

[54] 1979, SCI HILL FARMING 25

[55] 1972, NSCA9 N SCOTL COLL A