EFFECT OF PRE AND POST EMERGENCE HERBICIDES ON WEED DYNAMICS, NODULATION, GROWTH YIELD AND ECONOMICS OF BLACKGRAM (Vigna mungo L. Hepper)
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Date
2017
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Indira Gandhi Krishi Vishwavidhyalaya, Raipur
Abstract
The present investigation entitled “Effect of pre and post-emergence herbicides on weed dynamics, nodulation, growth, yield and economics of blackgram (Vigna mungo L. Hepper)” was carried out during kharif season of 2016 at Instructional cum Research Farm, Indira Gandhi Krishi Vishwavidyalaya, Raipur, Chhattisgarh, with the objective to observe the effect of pre and post-emergence herbicides on growth, nodulation, yield and of blackgram. The soil of the experimental field was medium texture with low, medium and high in N, P and K, respectively. The climate of the region is sub-humid to semi-arid.
The experiment was comprised of weed management practices viz. T1 - Weedy check , T2 - Pendimethalin @ 1000 ml ha-1-PE, T3 - Pendimethalin 30 EC + Imazethapyr 2 EC @ 1000 ml ha-1 – PE, T4 - Imazethapyr 10 % SL @ 55 g ha-1 at 20 DAS PoE, T5 - Imazamox 35 WG + imazethapyr 35 WG @ 40 g ha-1 at 20 DAS PoE, T6- Imazamox 35 WG + imazethapyr 35 WG @ 60 g ha-1 at 20 DAS PoE, T7 - Clodinafop propargyl 8 % EC + Aciflourfen sodium 16.5 % EC @ 125 g ha-1 at 20 DAS PoE , T8 - Clodinafop propargyl 8 % EC + Aciflourfen sodium 16.5 % EC @ 187.5 g ha-1 at 20 DAS PoE, T9 -Two manual weedings at 20 and 40 DAS. Experiment was laid out in Randomized Block Design with three replications. Blackgram variety Indira Urd Pratham was sown on 19th July, 2016 at a spacing of 30 cm x 10 cm with a seed rate of 20 kg ha-1. The crop was harvested on 18th October, 2016.
Result indicated that the T9- Two manual weedings at 20 and 40 DAS was found effective in enhancing plant height, growth of branches and dry matter production of blackgram showed at par with T8 - Clodinafop propargyl 8 % EC + Aciflourfen sodium 16.5 % EC @ 187.5 g ha-1 at 20 DAS, and T6- Imazamox 35 WG + Imazethapyr 35 WG @ 60 g ha-1 at 20 DAS.
T9 –Two manual weedings at 20 and 40 DAS was found effective in enhancing number of nodules plant-1, dry weight of nodules and crop growth rate followed by T8 - Clodinafop propargyl 8 % EC + Aciflourfen sodium 16.5 % EC @ 187.5 g ha-1 at 20 DAS, T6- Imazamox 35 WG + imazethapyr 35 WG @ 60 g ha-1 at 20 DAS and T3 - Pendimethalin 30 EC + Imazethapyr 2 EC @ 1000 ml ha-1 – PE.
In the experiment, total weed density and dry matter accumulation of grasses, broad leaf weeds and sedges were observed throughout crop growth period. Lowest weed density and highest weed control efficiency were found under T9- Two manual weedings at 20 and 40 DAS. Lowest weed index was observed under T8 - Clodinafop propargyl 8 % EC + Aciflourfen sodium 16.5 % EC @ 187.5 g ha-1 at 20 DAS, , T6- Imazamox 35 WG + imazethapyr 35 WG @ 60 g ha-1 at 20 DAS.
Highest cost of cultivation and gross return, energy input, energy output,energy output : input ratio and energy use efficiency was found in T9- Two manual weedings at 20 and 40 DAS. Highest net return was obtained under T8 - Clodinafop propargyl 8 % EC+ Aciflourfen sodium16.5 % EC @ 187.5 g ha-1 at 20 DAS.
Description
EFFECT OF PRE AND POST EMERGENCE HERBICIDES ON WEED DYNAMICS, NODULATION, GROWTH YIELD AND ECONOMICS OF BLACKGRAM (Vigna mungo L. Hepper)
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