Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges &
Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
the present investigation was undertaken with the objectives to study the effect of different preemergence
and post-emergence herbicides on growth and yield of kharif sweet corn, weed
control efficacy of different herbicides in kharif sweet corn and to work out the economics of
different treatments.
Methodology
The field experiment was conducted at research farm of AICRP on Irrigation Water
Management, Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani (MS) during kharif
2021. The field experiment was laid out in randomized block design with eight treatments and
replicated thrice. Treatment consisted of five different molecules of post emergence herbicides
and for comparison one treatment each of pre-emergence herbicide, weedy check (unweeded
control) and weed free treatment (2 Hand weeding). Seeds of sweet corn (Var. Sugar-75) were
dibbled at the spacing of 60cm x 20cm on 29 June 2021. The recommended dose of NPK
(150:75:75 NPK kg ha -1 ) and plant protection schedule was followed.
Results
The data furnished in Table revealed that green cob yield, GMR and NMR of sweet corn was
significantly influenced by different weed management treatments. Weed free treatment (T 7)
recorded significantly higher green cob yield and GMR of sweet corn, however it was
comparable with application of PoE Mesotrione 2.27% w/w + Atrazine 22.7% w/w SC @ 875g
a.i.ha -1 at 20-25 DAS (T 6), PE Atrazine @ 1 kg a.i. ha -1 + one hand weeding at 20 DAS (T 1)
and PoE Tembotrione 34.4% SC 120g a.i.ha -1 at 20-25 DAS(T4). These findings are parallel
with the earlier findings reported by Chhokar et al. (2019) wherein mesotrione and atrazine
combination has synergistic effect, which ultimately helped in managing diverse weed flora in
maize and enhancing its productivity. Due to cost effective weed management higher NMR
was obtained in herbicidal treatments. Application of PoE Mesotrione 2.27% w/w + Atrazine
22.7% w/w SC @ 875 g a.i.ha -1 at 20-25 DAS (T6) recorded significantly higher NMR and
was at par with PE Atrazine @ 1 kg a.i. ha -1 + one hand weeding at 20 DAS (T 1), PoE
Tembotrione 34.4% SC 120g a.i.ha -1 at 20-25 DAS (T4) and weed free treatment (T7). Similar
trend was observed in respect of B:C ratio.
Mean green cob yield, GMR and NMR of sweet corn as influenced by different weed
management treatments
Treatments
T 1 : PE Atrazine @ 1 kg a.i. ha -1 + one hand
weeding at 20 DAS
Green cob
yield (q ha -1 )
GMR
(Rs. ha -1 )
NMR
(Rs. ha -1 )
B:C
Ratio
162.62 167417 109834 2.89
377 | Page Managing genetic resources for enhanced stress tolerance