Evaluation of Treflan application manner on weeds control under different tillage methods in cotton cultivation (Gossypium hirsutum L.)

In order to evaluate the effects of different tillage methods and Treflan application manner on cotton yield and weeds control, this study was conducted in a research farm in south east of Ali Abad Katool district in 2014. This study arranged in split block design under RCBD with 4 replications. Main factors were tillage (Moldboard plow (T1), disk plow (T2) and chisel plow (T3)), and Treflan application manner as sub factor (hand hoeing (H1), Treflan application by PPI methods with 1.5 lit/ha plus using of Treflan at the sixth weeks after planting with application rate of 1.5 lit/ha with irrigation (herbigation) (H2), Treflan application by PPI methods with 1.5 lit/ha plus using of Treflan at the sixth weeks after planting with application rate of 1.5 lit/ha with soil incorporated by cultivator (H3), 3 lit/ha Treflan application after sowing by PPI before irrigating (H4) and 3 Lit/ha Treflan application before sowing by PPI before irrigating (H5) and no weed control (H6)). In current study, the most relative abundance percent was belonged to redroot pigweed (Amaranthus retroflexus L.) and board leaf weeds. Results revealed that tillage factor had no significant effect on total lint yield and total weed dry weight except of boll number per plant. The highest total lint yield was produced by hand hoeing among different herbicide levels., Total dry weight of weed in forth week after cotton sowing had main role for the maximum total lint yield production, meanwhile the most significant and positive correlation among yield with yield components was seen with boll number per plant. Investigation of traits interaction effects showed that in case of no application of hand hoeing in cotton cultivation, it could be recommended to apply 3 Lit/ha Treflan before sowing.