The Effect of Number of Weedings and the Type of Herbicides on Yield and Yield Components of Cotton

Subject Areas : Semi Annual Journal of Weed Ecology

Mohammad  Armin ¹ (استادیار زراعت، دانشگاه آزاد اسلامی واحد سبزوار، سبزوار، ایران)
Mohammad Esmaeil  Kashki ² (کارشناس ارشد زراعت، دانشگاه آزاد اسلامی واحد سبزوار، سبزوار، ایران)
Mostafa  Heidari ³ (دانشیار دانشگاه صنعتی شاهرود)

Received: 2012-12-08 Accepted : 2017-01-06 Published : 2014-08-23

Keywords:

Abstract :

The effect of hand weeding and the type of herbicides application on yield and yield components of cotton was investigated as factorial arrangement based on rrandomized complete block design with 3 replications in Davarzan section of Sabzevar.The factors of the study included of the type of herbicide at 4 levels (soil incorporated, post emergence, incur porated soil + post emergence, and control) and weeding number at 3 levels (weedy check, once and twice hand weeding). Trifluralin (1200 gai/ha) and Trifloxysulfuron sodium (15 gai/ha with cytogate 2/1000) were selected as pre plant soil incorporated herbicides and post emergence herbicide, respectively. The result showed that twice hand weeding had the highest economic yield. There wasn’t significant difference between once and twice weeding for economic yield. Between yield components, the number of boll and reproductive branches were affected more by times of weed control, especially two times weed control. The highest yield and yield component were achieved in soil applied + plus post emergence treatment. Although post emergence application herbicide had more yield but did not control weeds effectively. Overall, applied soil + post emergence treatment plus one time hand weeding provide a good weed control and gained suitable economic yield.