Choudhary, RakeshKumar, SurendraSingh, IshwarMehriya, M.L.2021-12-042021-12-042020-11-02Kumar Surendra 2020. Efficacy of Herbicides on Growth and Yield of Pearl millet [Pennisetum glaucum (L.) R. Br.] M.Sc. thesis, College of Agriculture, Agriculture University Jodhpurhttps://krishikosh.egranth.ac.in/handle/1/5810178606A field experiment was conducted at Instructional Farm, College of Agriculture, Jodhpur during kharif, 2019 to study the “Efficacy of herbicides on growth and yield of pearl millet [Pennisetum glaucum (L.) R. Br.]”. The experiment was laid out in randomized block design wherein, thirteen treatments were undertaken and replicated thrice. The treatments taken in the investigation were T1- Tembotrione 42% SC @ 90 g a.i. ha-1 at 20 DAS, T2- Tembotrione 42% SC @ 100 g a.i. ha-1 at 20 DAS, T3- Tembotrione 42% SC @ 110 g a.i. ha-1 at 20 DAS, T4- Tembotrione 42% SC @ 120 g a.i. ha-1 at 20 DAS, T5- Tembotrione 42% SC @ 90 g a.i. ha-1 at 25 DAS, T6- Tembotrione 42% SC @ 100 g a.i. ha-1 at 25 DAS, T7- Tembotrione 42% SC @ 110 g a.i. ha-1 at 25 DAS, T8- Tembotrione 42% SC @ 120 g a.i. ha-1 at 25 DAS, T9- Atrazine 50% WP @ 400 g a.i. ha-1 (PE) fb Tembotrione 42% SC @ 90 g a.i. ha-1 at 25 DAS, T10- Atrazine 50% WP @ 400 g a.i. ha-1 at 20 DAS fb one hand weeding at 35 DAS, T11- Atrazine 50% WP @ 500 g a.i. ha-1 (PE) fb one hand weeding at 30 DAS, T12- Weedy check and T13- Weed free. Among weed management treatments, atrazine 50% WP @ 400 g a.i. ha-1 (PE) fb tembotrione 42% SC @ 90 g a.i. ha-1 at 25 DAS showed the lowest weed density (3.96 m-2) and weed dry weight (1.79 g m-2) at 20 DAS. But lower weed density of total weeds (broad and narrow leaved) at 40 DAS and at harvest stage were found in atrazine 50% WP @ 400 g a.i. ha-1 at 20 DAS fb one hand weeding at 35 DAS (2.40 m -2 & 2.50 m-2). The lowest dry matter at 40 DAS (1.76 g m-2) and harvest stage (2.56 g m-2) were found in atrazine 50% WP @ 400 g a.i. ha-1 at 20 DAS fb one hand weeding at 35 DAS and atrazine 50% WP @ 500 g a.i. ha-1 (PE) fb one hand weeding at 30 DAS over weedy check, respectively. The higher weed control efficiency was recorded by application of pre and post emergence herbicides i.e. atrazine 50% WP @ 400 g a.i. ha-1 (PE) fb tembotrione 42% SC @ 90 g a.i. ha-1 at 25 DAS (80.94%) at 20 DAS. At 40 DAS atrazine 50% WP @ 400 g a.i. ha-1 at 20 DAS fb one hand weeding at 35 DAS was found superior with weed control efficiency of 96.52% but application of pre-emergence atrazine 50% WP @ 500 g a.i. ha-1 (PE) fb one hand weeding at 30 DAS showed maximum control efficiency (95.04%) at harvest stage. The lowest weed index was found with atrazine 50% WP @ 500 g a.i. ha-1 (PE) fb one hand weeding at 30 DAS (7.93%). The significant taller plant and plant dry matter at all crop growth stages (74.9 cm & 179.6 cm) and (77.7 g m -2 & 672.1 g m-2) were recorded with the application of atrazine 50% WP @ 500 g a.i. ha-1 (PE) fb one hand weeding at 30 DAS. The maximum value of yield attributes viz. effective tillers (2.67 plant-1), test weight (8.29 g), girth (31.43 mm), ear head length (28.53 cm), grain yield (2194 kg ha-1), stover yield (4527 kg ha-1), and biological yield (6721 kg ha-1)were observed with the treatment atrazine 50% WP @ 500 g a.i. ha-1 (PE) fb one hand weeding at 30 DAS. Economic evaluation of treatment weed free fetched highest gross return (` 81681 ha-1) and net return (` 56933 ha-1) followed by atrazine 50% WP @ 500 g a.i. ha-1 (PE) fb one hand weeding at 30 DAS fetched highest gross return (` 75573 ha-1) and net return (` 54620 ha-1) however, atrazine 50% WP @ 400 g a.i. ha-1 (PE) fb tembotrione 42% SC @ 90 g a.i. ha-1 at 25 DAS depicted higher profitability level in respect of B: C ratio (3.75). Weed free was obtained maximum profitability (` 686 day-1) followed by atrazine 50% WP @ 500 g a.i. ha-1 (PE) fb one hand weeding at 30 DAS (` 658 day-1) and atrazine 50% WP @ 400 g a.i. ha-1 (PE) fb tembotrione 42% SC @ 90 g a.i. ha-1 at 25 DAS (` 647 day-1).EnglishThesis