Photoperiod Effects on the Reproductive Biology of Purple Nutsedge(Cyperus rotundus)

The effects of 8-, 12-, and 16-h photoperiods on the growth and reproductive biology of purple nutsedge(Cyperus rotundusL.) were investigated over a 3-month period. Plants under the 8-h photoperiod produced the least total, shoot, root, rhizome, and tuber dry weight. Flowering occurred only at the 12-h photoperiod; thus, purple nutsedge is intermediate in flowering response to daylength. Although the total dry weight varied with photoperiod, the relative amount of dry weight (as percent of total weight) partitioned to shoots, roots, rhizomes, and tubers was constant.