Cyperus esculentus interference in Cucumis sativus

Field studies were conducted near Tifton, GA, from 1995 to 1997 to measure Cyperus esculentus (yellow nutsedge) interference with 'Fancipack' Cucumis sativus (cucumber) using a response prediction experiment with a natural in festation of C. esculentus. Cucumis sativus was direct-seeded each year. Pl ots (1.8 by 1.8 m) were established immediately after crop emergence. Cyper us esculentus plants were counted 2 wk after crop emergence in each plot, a t which time four weed-free plots were randomly established. C. esculentus densities ranged from 0 to 955 plants m(-2). Total yield, plant biomass, an d C. sativus stand were regressed against C. esculentus density and biomass . Regression analysis showed a 5% reduction in C. sativus yield with a C. e sculentus infestation of approximately 15 plants m(-2). A uniform C. sativu s stand maximized its competitive ability and minimized interference from C . esculentus. Cyperus esculentus was more competitive and reduced C. sativu s yields when C. sativus stands were low and nonuniform.