Effect of Different Weed Management Practices on Growth and Yield of Aerobic Rice (Oryza sativa L.)

Abstract

The field investigation was conducted at Zonal Agricultural Research Station (ZARS), University of Agricultural Sciences, GKVK, Bangalore during 2017 to study the effect of different weed management practices on growth and yield of rice under aerobic condition. The experiment was laid out in a randomized complete block design (RCBD) with 11 treatments and three replications. The results revealed that among different weed management practices, stale seedbed technique fb bispyribac sodium 10 per cent SC @ 30 ml a.i. ha-1as early post-emergent (PoE) spray + one intercultivation (IC) @ 40 DAS recorded significantly higher grain yield (5987 kg ha-1), straw yield (9944 kg ha-1), productive tillers per hill (42.50), panicle length (25.40 cm), 1000 grain weight (26.27 g) and nutrient uptake by crop (134.22, 43.95 and 131.55 kg NPK ha-1, respectively), while it recorded lower weed count (10), weed dry weight (6.88 g/0.25 m2) and nutrient uptake by weeds (7.63, 1.51 and 4.93 kg NPK ha-1, respectively). However, it was on par with straw mulch @ 6 t ha–1fb bispyribac sodium 10 per cent SC @ 30 ml a.i. ha-1 as PoE , pyrazosulfuron ethyl 10 per cent WP @ 35 g a.i. ha-1 as pre-emergent (PE) spray fb bispyribac sodium 10 per cent SC @ 30 ml a.i. ha-1as early PoE, pendimethalin 30 per cent EC @ 1.5 L ha-1as PE fb bispyribac sodium 10 per cent SC @ 30 ml a.i. ha-1as early PoE and pyrazosulfuron ethyl 10 per cent WP @ 35 g a.i. ha-1as PE + one IC as per package of practices. Higher net returns and higher benefit-cost ratio was obtained with the application of pyrazosulfuron ethyl 10 per cent WP @ 35 g a.i. ha-1 as PE + one IC as per package of practice.