The SCREENING OF HERBICIDES FOR EFFECTIVE CONTROL OF WEEDS IN SOYBEAN (Glycine max L.)

Abstract

Little is known about best herbicidal weed option for weed eradication in soybean in agro-climatic circumstances of Sargodha, Punjab, Pakistan. A two year field study was accomplished at College of Agriculture experimental site Sargodha in spring seasons of 2018 and 2019 to evaluate the efficacy of different herbicides adjacent to major weeds present in soybean. The study consisted of 8 herbicide treatments including two pre-emergence herbicides (pendimethalin at 489.1 g a.i. ha-1, pendimethalin + S-metolachlor at 731.1 g a.i. ha-1) which are applied immediately after sowing and six post-emergence herbicides (oxyfluorfen at 237.1 g a.i. ha-1, metribuzin at 518.7 g a.i. ha-1, quizalofop-p-ethyl at 148.2 g a.i. ha-1, acetochlor at 741 g a.i. ha-1, halosulfuron at 37 g a.i. ha-1and topramezone at 21.5 g a.iha-1) which were used 25 days subsequent to sowing. In contrast to control, all herbicides have shown significant decline in weed density (up to 94%) and dry weight (up to 88%); and caused significant increases in plant height (up to 85%), pod bearing branches (up to 77%), number of pods per plant (up to 83%), 100-seed weight (up to 37%) and seed yield (up to 160%) of soybean. Among herbicides, topramezone at 21.5 g a.i ha-1 gave significantly the highest (1234 and 1272 kg ha-1 in the year 2018 and 2019) seed yield of soybean and HEIs (1.28 and 1.03 in year 2018 and 2019, respectively). However, oxyfluorfen at 237.1 g a.i. ha-1, pendimethalin + S-metolachlor at 731.1 g a.i. ha-1, pendimethalin at 489.1 g a.i. ha-1, quizalofop-p-ethyl at 148.2 g a.i.ha-1 followed it. The regression analysis depicted a significant negative moderate relationship of soybean seed yield with weed dry weight (R2 = 0.7074), and pods per plant (R2 = 0.7012) was proved to be the main yield component responsible for higher yield of soybean.

Assessing Herbicide Efficacy and Susceptibility for Weed Management and Enhancing Production of Non-GMO Soybean Cultivation

“…These results are in lined with Singh et al [62]. The results suggest that a tailored approach to herbicide application, considering the timing (PRE vs. POST) and the specific herbicide combinations, is essential for effective weed control in soybean cultivation [61]. Care must be taken to select herbicide treatments that minimize crop injury while maximizing weed suppression to ensure optimal soybean growth and yield.…”

“…Kulal et al [69] and Prachand et al [50] discovered same outcomes, S-Metolachlor + Pendimethalin were particularly effective in achieving superior weed control and promoting higher seed weight in soybean crops. Safdar et al [61] also reported the similar results that S-Metolachlor + Pendimethalin significantly affect the soybean plant height, whole plant weight, pods plant -1 , seeds plant -1 , 100 grain weight, and seed yield plant -1 . Whereas Pendimethalin + Acetochlor and S-Metolachlor + Atrazine exhibited the most substantial reduction in plant height.…”

“…However, herbicides such as S-Metolachlor + Atrazine + Mesotrione, Topramezone, Mesosulfuron-methyl + Iodosulfuron-methyl sodium and Mesotrione + Atrazine had no WCE or HEI data, which indicates total crop failure due to herbicide damage. Safdar et al [61] also reported the highest WCE with S-Metolachlor + Pendimethalin herbicide. When comparing these herbicide treatments, several options, including S-Metolachlor + Pendimethalin, Pendimethalin, S-Metolachlor, Fluizefop-p-butyl, consistently displayed high WCE values in both years, indicating effective weed control [59].…”

Effects of selected herbicides on management of weeds in finger millet (Eleusine coracana L)

“…Herbicides provide crops with a competitive edge over emerging weeds, as demonstrated by Kumar et al (2021), who showed that 2,4-D amine salts were effective in controlling weeds and increasing yields by up to 43% compared to the weedy check. Hayyat et al (2016) reported that application of MCPA controlled broadleaf weeds in wheat. Greatest limitation of use of herbicide in finger millet is that no herbicide has been formulated or registered exclusively for the control of weeds in finger millet.…”