Economics of Post-Emergence Weed Control in Garden Pea (Pisum sativum L.) under Mid Hill Condition of Himachal Pradesh

A field experiment consisting of twelve treatments [viz. pendimethalin 1500 g/ha (pre-emergence, pre), pendimethalin 1000/ imazethapyr 100 g/ha (pre) followed by (fb) imazethapyr 100 g/ha post-emergence (post), imazethapyr + pendimethalin (Vellore) 1200 and 1500 g/ha (pre), imazethapyr + pendimethalin 1000 g/ha (pre) fb imazethapyr 100 g/ha (post), imazethapyr + imazamox (Odissy) 60 and 90 g/ha (post), pendimethalin 1000 g/ha fb imazethapyr + imazamox 60 g/ha (post), pendimethalin 1000 g/ha fb hand weeding (45 DAS), weed free and weedy check] was carried out during the winter season of 2012- 13 and 2013-14 on a silty clay loam soil at Palampur to study the impact of post-emergence (post) weed control in pea. Weed free, pendimethalin fb hand weeding, pendimethalin fb imazethapyr + imazamox, imazethapyr + pendimethalin fb imazethapyr and imazethapyr + imazamox 60 g/ha gave more than 85% weed control efficiency upto 60 DAS. Weed free, pendimethalin 1000 g/ha fb HW (45 DAS) and pendimethalin 1000 g/ha fb imazethapyr + imazamox 60 g/ha (45 DAS) gave significantly higher green pod yield. Imazethapyr 100 g/ha fb imazethapyr 100 g/ha (45 DAS) had minimum weed persistence index (WPI). Crop resistance index (CRI) was highest under pendimethalin 1000 g/ha fb HW (45 DAS) followed by pendimethalin 1000 g/ha fb imazethapyr + imazamox 60 g/ha (45 DAS). Application of pendimethalin 1000 g/ha fb HW (45 DAS) followed by pendimethalin 1000 g/ha fb imazethapyr + imazamox 60 g/ha (45 DAS) resulted in higher net returns. Marginal benefit cost ratio (MBCR) was highest under imazethapyr + imazamox 60 g/ha (25.28).