EFFECT OF ALLELOPATHIC CROP WATER EXTRACTS AND THEIR COMBINATIONS ON WEEDS AND YIELD OF GROUNDNUT (ARACHIS HYPOGAEA L.).

Allelopathic crop water extracts mixtures integrated with herbicides alongwith lower rates of haloxyfop 10.8 EC were evaluated to control weeds in groundnut under rainfed system in the Department of Agronomy, PMAS Arid Agriculture University, Rawalpindi, Pakistan during 2009 and 2011. The experiment was laid out in RCBD with nine treatments viz. control (T1) control, hand weeding (T2) haloxyfop 10.8 EC @ 108 g a.i. per hectare 30 days after sowing (T3) barley water extract @ 20 L per hectare 30 and 50 days after sowing (T4) brassica water extract @ 20 L per hectare 30 and 50 days after sowing (T5) barley water extract + brassica water extract @ 10+10 L per hectare 30 and 50 days after sowing (T6) barley water extract + brassica water extract @ 10+10 L per hectare + haloxyfop @ 27 g a.i. per hectare 30 days after sowing (T7) barley water extract + brassica water extract @ 10+10 L per hectare + haloxyfop @ 54 g a.i. per hectare 30 days after sowing (T8) and barley water extract + brassica water extract @ 10+10 L per hectare + haloxyfop @ 81 g a.i. per hectare 30 days after sowing (T9). Results revealed that integration of crop water extracts with reduced rates of haloxyfop decreased density and dry weights of total weeds by 19 to 39 percent and 14 to 38 percent, respectivly. Treatment (T3) reduced density by 33 and 38 percent and dry weight by 13 and 26 percent during 2009 and 2011, respectively. Maximum number of pods per plant, kernels per pod and pods yield were recorded in T2. Statistically similar yields were obtained from allelopathic water extracts combined with reduced rates of herbicide and its full dose. Maximum net benefits i.e. (Rs.71415, 73635/ha) were achieved in T9 during both years 2009 and 2011 respectively. Marginal rate of return ranged from 24-944 percent from herbicide mixed with extracts. To suppress weeds in groundnut crop it is economical to use combinations of barley and brassica crop extracts with 50-75 percent of haloxyfop. [ABSTRACT FROM AUTHOR]