The field experiment was conducted at experimental farm, AICRP on Integrated Farming Systems, Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani (M.S.) during kharif 2019-20 and 2020-21 seasons to study “Response of Bt cotton (Gossypium hirsutum L.) to tillage and weed management practices in vertisol”. Treatment consisted of sixteen treatment combinations comprising four tillage practices (T1- Conventional tillage, T2- Rotary tillage, T3- Minimum tillage, T4- Zero tillage) in main plot, and four weed management practices (W1 - Weed check,W2 - Weed free, W3 – Pendimethalin (30% EC) @ 0.75 kg ha-1 as PE + Quizalofop ethyl (5% EC)@ 50 g ha1(PoE) + Hoeing. and W4- Pendimethalin (30% EC) @ 0.75 kg ha-1 as PE +Pyrithiobac-sodium (10% EC) @ 62.5 g ha-1 (PoE) + Straw mulching 2.5t/ha. The result of the study revealed that conventional tillage (T1) recorded lesser weed population and weed dry weight and higher weed control efficiency with lower weed index and higher seed cotton yield (kg ha-1) than other treatments and however it was at par with rotary tillage (T2). Among the weed management practices weed free (W2) recorded) recorded lesser weed population and weed dry weight and higher weed control efficiency with lower weed index and higher seed cotton yield (kg ha-1) and however it was at par with Pendimethalin (30% EC) @ 0.75 kg ha-1as PE +Pyrithiobac-sodium (10% EC) @ 62.5 g ha-1 (PoE) + Straw mulching 2.5t/ha (W4).

Herbicide,Weed density, weed control efficiency, weed index, seed cotton yield.

It can be concluded that- Among tillage practices conventional tillage (T1) recorded lesser weed population, weed dry weight and higher weed control efficiency with lower weed index and higher seed cotton yield (kg ha-1) than other treatments and however it was at par with rotary tillage (T2). Among weed management practices weed free (W2) recorded lesser weed population, weed dry weight and higher weed control efficiency with lower weed index and higher seed cotton yield (kg ha-1) and however it was at par with Pendimethalin (30% EC) @ 0.75 kg ha-1 as PE +Pyrithiobac-sodium (10% EC) @ 62.5 g ha-1 (PoE) + Straw mulching 2.5t/ha (W4).

Pawar S.B., Karle A.S., More V.R. and Narkhede W.N (2022). Effect of Tillage and Weed Management Practices on Weed Density and Yield of Bt Cotton (Gossypium hirsutum L.) in Vertisol. Biological Forum – An International Journal, 14(2): 1474-1480.