Study on the development of yellow nutsedge (Cyperus esculentus L.) with growth analysis.

Yellow nutsedge (Cyperus esculentus) is a cosmopolitan, tropical, subtropical plant. Nowadays, the Working Committee of Invasive Plants of the EPPO considers it as a highly damaging internationally important weed. During our work the development of the yellow nutsedge grown was examined until the end of flowering. The 5 repetition pot experiment has been started April 19 2007. Large-sized pots were filled with a mixture of mould and sandy loam in a ratio of 1:1, and planted in each pot 25 yellow nutsedge tuberlets. Weekly one plant and its progeny were harvested from each pot to measure their fresh and dry shoot and underground part (root, tuber and rhizome) weights and leaf area. Samplings were made at 16 occasions between 2007 26 of April and 24 of August. Results were considered by growth analysis. We studied RGR (relative growth rate), LAR (leaf area ratio), RLGR (relative leaf growth rate). Summarised it can be stated, that the beginning of the dynamic growing is 6 week after germination. The dry weight of the shoots is over the dry weight of the underground parts in the examined period. The RGR shows just a minimal change. The LAR was the highest between 17 May and 8 June.