Examination of the effects of various weed control treatments on weed management indices in Kharif grain sorghum [Sorghum bicolor (L.) Moench]

Abstract

An experiment was conducted to evaluate the efficacy of several herbicides used separately and in combination against weeds in grain sorghum at the Sorghum Research Station, VNMKV, Patbhani, (MS), India. There were 16 treatments in total: T1: Atrazine 50 WP @ 0.50 kg a.i./ha , T2: Metolachlor 50% EC @ 1.00 kg a.i./ha as PE , T3: Pyroxasulfone 85% w/w WG @ 0.1275 kg , T4: T1 + Bentazone 480 g/l SL @ 960 g a.i./ha , T5: T1 + Mesotrione 2.27% w/w + Atrazine , T6: T1 + Carfentrazone ethyl 40% DF @ 20 g, T7: T2 + Bentazone 480 g/l SL @ 960 g a.i./ha , T8: T2 + Mesotrione 2.27% w/w + Atrazine , T9: T2 + Carfentrazone ethyl 40% DF @ 20 g , T10: T3 + Bentazone 480 g/l SL @ 960 g a.i./ha , T11: T3 + Mesotrione 2.27% w/w + Atrazine , T12: T3 + Carfentrazone ethyl 40% DF @ 20 g , T13: T1 (PE & POE), T14: T1 + 2,4-D Na Salt 80 WP@ 0.75 kg a.i./ha and T15: Weed free ( 15 and 35 DAS) replicated twice in randomized block design during growing seasons of 2021-22. All chemical weed control treatments significantly reduced the weed infestation over weedy check, according to weed indices that were determined. Study demonstrates that pre-emergence application T2: Lower grain sorghum yield compared to atrazine treatments and T3: Pyroxasulfone 85% w/w WG @ 0.1275 kg a.i./ha as PE; both treatments contained 50% EC at 1.00 kg a.i./ha as PE. T3: The minimum germination recoded as 62% WCE was reported for sorghum grain when pyrosulfone was applied at a rate of 85% w/w WG at 0.1275 kg a.i./ha. Management T15: Compared to the treatment, weed-free areas with 15 and 35 DAS produced the maximum yield (2605 kg/ha). T14: T1 coupled with 2,4-D Na Salt 80 WP@ 0.75 kg a.i./ha T1: 100 WP at 0.50 kg a.i./ha (PE) + T6: T1 + 40% Carfentrazone ethyl 40% DF @ 20 g a.i./ha as PoE at 3-4 leaves. This may be because of a larger accumulation of growth and yield qualities of grain sorghum due to lesser weed-crop competition, since these treatments show higher WCE and lower WI compared to the remainder of the treatment and are statistically shown to be at par grain yield of grain sorghum as in weed free condition.

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