A field experiment was conducted to investigate the spatial distribution of nutsedge (Cyperus spp L.) seed
bank in rice growth cycle using geostatistics in 2010e11. The sampling from seed banks were performed
prior to rice farm preparation and after rice harvest; also weeds density was determined in three
different dates during the growing season. The results showed that the highest amount of weed population
was belonging to nutsedge (Cyperus spp. L.) including Cyperus difformis, C. rotundus and
C. esculentus species. Nugget/sill ratios for all variogram models ranged from 15.2 to 46.9%, indicated that
there was strong and moderate spatial correlation as spherical and exponential variograms models
between weed and seedling nutsedge at all stages of sampling. Visual assessments of the weed growth in
these field indicated that the weed exist in patches, but mapping results showed that the size and
morphology of these patches varied within field. In the present study, seed bank patchy pattern was
roughly in accordance with seedling germination pattern. Generally the provided seed bank maps can be
used not only as information database of seedling germination, but also for predicting of seed bank
dynamics and weed management programs.