تاثیر مدیریت شیمیایی و تلفیقی علف های هرز بر عملکرد و اجزای عملکرد و جمعیت علف های هرز ذرت دانه ای در شمال خوزستان

In order to investigate the effects of chemical and integrated weed management on yield and yield components of grain maize and weed population, the study has been conducted as a randomized complete block design with three replications in ۲۰۱۸-۱۹ in Shavar Research Center in Shavar region of Shousha city. Treatments include unweeded (control), hand weeding, ۱.۵ liters of atrazine, ۱ liter of atrazine + straw mulch, ۱۷۵ g of ultima, ۱۵۰ g of ultima + straw mulch, ۱.۵ liter ۲,۴-D + MCPA, ۱ liter ۲,۴-D + MCPA + straw mulch, ۱.۵ liters cruise, and ۱ liter of cruise + straw mulch. Results show that the highest grain yield has been obtained in hand weeding treatment as well as ۱ liter of cruise + straw mulch by ۱۴.۴ and ۱۳.۲ t ha-۱, respectively. The highest biological yield is recorded in hand weeding treatment (۳۱.۵ t ha-۱). In case of harvest index, ۱.۵ liters of cruise show the highest value (۵۵.۷%), followed by ۱.۵ liters of ۲,۴-D + MCPA and ۱.۵ liters of atrazine by ۵۳.۶% and ۴۷.۷%, respectively. In terms of weed population dynamics, hand weeding, and ۱ liter of cruise + straw mulch cause the greatest decrease in weed population and dry weight which reduce crop competition and increase productivity. In general, based on the results, the adoption of integrated approaches (chemical + cultural + mechanical) can make a significant contribution to increasing corn yield and reducing environmental pollution.

Keywords:

ذرت , شاخص برداشت , مالچ کلشی , مدیریت تلفیقی , مهار شیمیایی