A field experiment was conducted in 2014 and 2015 to find out the effect of herbicides on weed dynamics and productivity of wheat under Jharkhand situation. Two hand weeding performed in wheat crop at 30 and 60 DAS recorded significantly reduced weed density and weed dry matter of broad-leaf, grassy, sedges and total weeds at 30 and 60 DAS with WCE of 94.3 and 94.2%, respectively and was similar to post-emergence application of clodinafop 0.06 kg/ha and pre-emergence application of pendimethalin + metribuzin 1.0 kg/ha + 0.175 kg/ha. This resulted in maximum total and effective tillers, grain (3.08 t/ha) and straw (5.37 t/ha) yield and net return (` 32,019.00 and B:C ratio (1.33) compared to other herbicides application.
An experiment was conducted to find out the effect of tillage and weed control methods on weed dynamics and productivity of maize (Zea mays L.)-wheat (Triticum aestivum L.) cropping system. The treatments comprised of combinations of tillage sequences in main plots and weed control methods in sub plots. The results revealed that zero tillage in rainy and winter season is as good as conventional tillage method in reducing weed dry matter and producing maize and system yield, while, conventional tillage in rainy and winter seasons (CT-CT) and conventional tillage in rainy and zero tillage in winter (CT-ZT) reduced weed density as well as weed dry weight in wheat crop consequently, higher wheat grain yield was recorded compared to rest of the tillage sequences. Integrated weed management performed in maize and wheat (IWM-IWM) sequence recorded 51.78% and 61.96% higher maize grain yield and net return of maize, 18.40% and 17.23% higher wheat grain yield and net return of wheat, 31.78% and 34.96% higher system yield and net return respectively, compared to weedy check. Zero tillage with or without residue recorded improved soil pH, organic carbon, CO 2 and dehydrogenase activity. IWM in both the crops recorded higher yields, while significantly higher B:C ratio was under recommended herbicide i.e. atrazine 1.0 kg ha-1 pre emergence in maize and 2,4-D 0.5 kg ha-1 post emergence in wheat (RH-RH). IWM-IWM improved soil CO 2 and dehydrogenase activity than RH-RH sequences from their initial values.
The investigation was undertaken at Birsa Agricultural University, Ranchi during Kharif, 2014 and 2015. The experiment was laid out in randomized block design with sixteen treatments replicated thrice. The treatments comprised of pre-and post-emergence of imazathepyr 50, 70 and 80 g/ha; pre-and postemergence of ready mix imazethapyr 35% + imazamox 35% (Odyssey) 50, 70 and 80 g/ha; pre-emergence (PE) of pendimethalin 1000 g/ha, ready mix imazethapyr 2% + pendimethalin 30% (Vallor) 1000 g/ha, hoeing twice and weedy check. Post-emergence (PoE) of imazethapyr 35% + imazamox 35% 70 g/ha similar to PE of imazethapyre 80 g/ha, imazethapyr 35% + imazamox 35% 70 g/ha, imazethapyr 35% + imazamox 35% 80 g/ha, pendimethalin 1000 g/ha and PoE of imazethapyr 80 g/ha, imazethapyr 35% + imazamox 35% 50 g/ha recorded 69.86 and 126.72% significantly higher seed (1.12 t/ha) and straw yield (2.33 t/ha) respectively, 168.63% higher net return (` 24,126/-) and 192.41% higher B:C ratio (2.31) compared to weedy check owing to 87.29 and 86.08% weed control efficiency.
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