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The total weed seed storage in the plough layer of 20 cm was 93 965 seeds/m 2 , of which 36 taxa were defined. The proportion of seeds of annual and winter annual species in soil was 89.6 %. The number of rye seeds emerging in autumn was 614 per m 2 and weeds 224 per m 2. The total number of weeds was 381/m2 when the calculation was based on the time of maximal appearance. 0.3 % of the total amount of weeds emerged. Rye and Elymus repens were the dominant species in the above-ground vegetation, whereas the biomass of the other weeds remained poorly developed because of marked shading from these two. The maximum biomass of the living above-ground vegetation, 614 g/m2 , was achieved in the middle ofAugust (12. VIII). Net above-groundprimary production, measured by the harvesting method, was 664 g/m2 ■ year and underground production 190 g/m 2 • year, giving a total production of vegetation and detritus of 854 g/m2 -year. The net efficiency of the primary producers was 0.7 "In. Index words: weed primary production, winter rye, seasonal dynamics

Seasonal dynamics and primary production of the flora in a winter rye field in Finland