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Winter Annual Legumes for Use as Cover Crops in Row Crops in Northern Regions

I. Field Experiments

^a The Norwegian Crop Research Institute, Plant Protection Centre, Dep. of Herbology, N-1432 Aas, Norway

View larger version (40K): [in a new window]   Fig. 1 Monthly average of daily mean temperatures for the experiments sites and years. Presented normal temperatures are averages of 1961–1990

View larger version (50K): [in a new window]   Fig. 2 The development of dry weight of biomass (sum of living and dead plant material) of different winter annual legumes and a white clover cultivar, from sowing in the autumn 1994 until summer 1995 at three locations in Norway

View larger version (59K): [in a new window]   Fig. 3 The development of ground coverage (living and dead mulch) of different winter annual legumes and a white clover cultivar at three locations in Norway, from sowing in the autumn of 1994 until autumn of 1995. Not assessed in the autumn of 1995

View larger version (51K): [in a new window]   Fig. 4 The development of dry weight of weed biomass in spring and summer after sowing the previous autumn at three locations in Norway. The main weed species are specified. Less frequent weed species are grouped as `additional weeds'

View larger version (32K): [in a new window]   Fig. 5 Dry weight of biomass regrowth (assessed 3 weeks after date of cutting) of different winter annual legumes and a white clover cultivar at different cutting dates at three locations in Norway