The development of sugar beet takes place in a genetically fixed biannual cycle. The transition to the generative phase of the second year is effected by vernalization factors such as inductive temperature and light conditions. A year’s weed beet potential consists of germinating seeds from bolters of previous sugar beet and seeds from ground keepers (bolting plants from sugar beet harvest residues). Fertile bolter seeds remain dormant in the soil until disturbed by tillage in the following years, which can lead to the germination of new weed beet. Weed beet population and seed bank in the soil can in this way increase rapidly within only a few years. Initial field trials were conducted to investigate the influence of 4 different times on the biomass, number, weight and germinating capacity of bolting weed beet seeds in sugar beet. In comparison with late bolting weed beet, early flowering bolters showed significantly higher values in biomass, number and weight of seeds. The time of bolting tended to influence the number of viable seeds. A second series of field trials was conducted to investigate the reproduction potential of different slices of sugar beet root and small sugar beets in winter wheat. Three tissues (the crown, the crown including hypocotyl and small sugar beet) were buried in 0, 5 and 15 cm depth. The occurrence of seed plants was influenced by tissue, temperature in winter, cultural practice of following crop and covering. Emergence of the 3 different beet tissues was delayed and the total number decreased with increasing depth.
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