Studies on beet soil - part 2: weed seed in special samples.
Forty-eight samples of 'beet soil' from sedimentation ponds or dry discharge stations at sugar factories and from aggradations [heaps of beet soil washed off at farms?] in North, West and South Germany were examined for weed seeds. The distribution of plants found varied, depending on the storage conditions (wet for sedimentation ponds and aggradations; dry for dry discharge stations), storage period, depth of sampling and salt concentration. Different species of the Chenopodiaceae (notably C. rubrum and C. album) were abundant; other weeds present in high numbers were Matricaria chamomilla [Chamomilla recutita], Urtica urens, Amaranthus retroflexus and Juncus bufonius. The number of plants/sample in 'beet soils' was always lower than in arable land; there were no plant species likely to cause serious weed problems upon recycling beet soil to the fields. [For part 1, see Zuckerindustrie (1994) 119 679-684].