Effect of herbicides on distribution and interference of weeds, growth and yield of wheat (Triticum aestivum) in Kandahar, Afghanistan

Weeds are the major constraint to achieving higher wheat yield in Afghanistan. To evaluate weed interference and its impact on wheat, a field experiment was undertaken during winter season 2014–15 at Afghanistan National Agricultural Science Technology University (ANASTU), Kandahar. Seven control treatments comprising isoproturon 0.75 1.0 kg/ha 35 days after sowing (DAS), sulfosulfuron 20 25 g/ha DAS, + 2,4-D 0.5 DAS (tank-mix), weed-free check weedy were laid out randomized complete block design with three replications. Results showed that grassy weeds constituted 62.7% of total mostly dominant. All herbicides/weed influenced interference, cropgrowth significantly. Sulfosulfuron resulted significant reduction density by 95.2% (i.e. efficiency) dry weight 95.1% index), respectively. This treatment led improvements growth (Leaf area index, matter accumulation) grain (4.6 t/ha) biological yields (10.6 t/ha), superior other herbicide treatments. It increased 24.3% 17.8%, respectively, compared check. Therefore, application may be recommended for better Kandahar, Afghanistan, similar agro-ecologies tropics sub-tropics.