Full-season interference of Ipomoea hederacea with Gossypium hirsutum

Four field experiments were conducted to measure the effects of seven Ipomo ea hederacea (L.) Jacq. densities on Gossypium hirsutum L. lint yield, stri pper-harvest efficiency, and fiber properties. The seven densities were 0, 2, 4, 6, 8, 10, and 12 weeds 10 m(-1) of row. Data were used to develop pre diction models to compare with those previously constructed that used fewer experiments and fewer weed densities in this range. Gossypium hirsutum lin t yield in kilograms per hectare and as a percentage of the weed-free contr ol best fit a linear regression model. Gossypium hirsutum lint yield reduct ions for each increase of one weed 10 m(-1) of row ranged from 30.7 to 36.2 kg ha(-1) at Chickasha and from 35.4 to 36.4 kg ha(-1) at Perkins. Lint yi eld reductions for each weed 10 m(-1) of row ranged from 3.8 to 6.9% at Chi ckasha and from 3.9 to 6.0% at Perkins. All plots could be mechanically str ipper harvested, except for the 12-weed density at Chickasha in 1994 and th e 10- and 12-weed densities at Perkins in 1996. Harvest efficiencies were n ot significantly different in any experiment. The only fiber properties to display significant differences were micronaire and strength at Chickasha i n 1994. Prediction models calculated herein were highly similar to those pr eviously constructed.