Performance of Various Herbicides on Bt. Cotton under Rainfed Condition
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2016, Vol 4, Issue 9
Abstract
A field experiment entitled " Performance of Various Herbicides in Bt. Cotton under Rainfed Condition” was conducted during kharif season of 2015-16 at the farm Of Agronomy in Bhagwant University, Ajmer (Rajasthan). The experiment was laid out in RBD design replicated three with eight treatments, Pendimethalin 1.5 kg a. i. ha-1 PE + Hoeing, Quizalofop-ethyl 0.50 kg a. i. ha-1 PoE + Hoeing, Pendimethalin 2.0 kg a. i. ha-1 PE Fb Quizalofop-ethyl 0.50 kg a. i. ha-1 PoE + Hoeing, Pyrithiobac sodium 0.62 kg a. i. ha-1 PoE + Hoeing, Pyrithiobac sodium 0.62 kg a. i. ha-1 + Quizalofop-ethyl 0.50 kg a. i. ha-1 + Hoeing, Glyphosate @ 1.5 kg a. i. ha-1 as directed spray at 45 DAS, Weed free check and Weedy check. Cotton seed varietyMNH-886 Bt was sown on July 15, 2015 at a spacing 90 x 60 cm with RDF 60:35:35 NPK Kg ha-1 with a view to study the effect of post emergence weedicides on growth and yield of seed cotton, nutrient uptake by weeds and crop and to evaluate weed control efficiency and biomass production of weeds and cotton.In the field Commelina benghalensis, Cynodon dactylon, Cyperus rotundus, Digera arvensis, Parthenium hysterophorus and Celosia argentea were found dominant weeds. The best control of monocots and dicots, highest weed control efficacy and lowest weed biomass production was in weed free check (T7) followed by glyphosate @ 1.0 kg a. i. ha-1 as directed spray at 45 DAS (T6), quizalofop-ethyl 0.50 kg a. i. ha-1 PoE + Hoeing (T2) and pendimethalin 1.5 kg a. i.ha-1 PE Fb quizalofop-ethyl 0.50 kg a. i. ha-1 PoE + Hoeing (T3). Maximum improvement in growth characteristics like number of branches, plant height, number of functional leaves, leaf area, chlorophyll content, plant dry matter, AGR, RGR and NAR were found in weed free check followed by glyphosate @ 1.5 kg a. i. ha-1 as directed spray at 45 DAS, quizalofop-ethyl 0.50 kg a. i. ha-1 PoE + Hoeing, pendimethalin 2.0 kg a. i. ha-1 PE + Hoeing and pyrithiobac sodium 0.62 kg a. i. ha-1 + quizalofop-ethyl 0.50 kg a. i. ha-1 + Hoeing. Significantly highest seed cotton yield was found in weed free check followed by glyphosate @ 1.5 kg a. i. ha-1 as directed spray at 45 DAS, pendimethalin 1.5 kg a. i.ha-1 PE + Hoeing and pendimethalin 2.0 kg a. i.ha-1 PE Fb quizalofop-ethyl 0.50 kg a. i. ha-1 PoE + Hoeing. Lowest depletion of nutrients (NPK Kg ha- 1) by weeds and highest uptake by crop was in weed free check followed by glyphosate @ 1.0 kg a. i. ha-1 as directed spray at 45 DAS, pendimethalin 1.0 kg a. i.ha-1 PE + Hoeing and pendimethalin 1.0 kg a. i.ha-1 PE Fb quizalofop-ethyl 0.50 kg a. i. ha-1 PoE + Hoeing. Highest GMR and NMR was recorded under weed free check but highest B:C ratio with glyphosate @ 1.5kg a. i. ha-1 as directed spray at 45 DAS. Glyphosate @ 1.5 kg a. i. ha-1 as directed spray at 45 DAS was found most effective in controlling weeds and increasing seed cotton yield.
Authors and Affiliations
Gajendra Singh, Kosal Nagar, Dr. Dilip Gena, Rajveer Singh Rawat, Dr. Bhanwar Lal Jat
Keywords
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