effect of ecological management of weed control on economical income, yield and yield components of cotton (gossypium hirsutum l.)

in order to compare of ecological management of weed control on economical income, yield and yield components of cotton (gossypium hirsutum l.), a randomized complete block design with 12 treatments and four replications was conducted in mahvelat of khorasan razavi province, iran. treatments consisted of weeding, harrowing, burning, two times weeding, weeding + harrowing, weeding + burning, harrowing + harrowing, harrowing + weeding, harrowing + burning, weeding+ harrowing+ burning, weed free and weedy as a check treatment. investigated traits were plant height, number of boll in plant, 20 boll weight, 20 boll cotton lint weight, cotton lint yield per plant, cotton yield, number and biomass of weeds, outcome, net and gross income. the result showed that treatments had significant effect (p<0.01) on all traits. treatments including weeding simultaneous with harrowing caused 80 and 97 percent decrease in density and weed biomass, respectively. the highest yield (4051 and 4087 kg.ha-1) and net income (7.80 and 8.58 million rials per ha) obtained from weeding+ harrowing+ burning and weed free treatments, respectively. the highest expensive weed controls also concern with two these treatments. the lowest yield (1923 kg.ha-1) and net income (410,000 rials) were confirmed by check treatment. results of this study showed that weeding+ harrowing+ burning is the best method in cotton weed control.