Abstract
A field trial to investigate the response of wheat (Triticum aestivum L.) crop and its weeds to various crop water
extracts (sorghum, brassica and sunflower ) in combination with reduced rates of herbicide (Bromoxynil + MCPA
20 + 20 EC) was carried out at Research Area, College of Agriculture, Dera Ghazi Khan. The treatment
combinations were the mixture of all three crop water extracts each @ 15 and 18 L ha-1 combined with 1/2 and
1/3rd dose of Bromoxynil + MCPA. Individual herbicide (Bromoxynil + MCPA) treatments i.e. 1/2, 1/3, full dose and
a weedy check were included for comparison. Experiment was laid out in randomized complete block design
(RCBD) with 4 replications. An approved wheat cultivar, AS- 2002, was used as experimental material. The data
recorded at 70 DAS (days after sowing) showed that water extracts @ 18 L ha-1 combined with Bromoxynil +
MCPA 50 g a.i ha-1 inhibited total weeds density by 88%, total weeds fresh weight by 90% and total weeds dry
biomass by 95% and increased grain yield by 35% over control. Highest marginal rate of return was observed in
combination of crop water extracts each @18 La-1 tank mixed with 50 g a.i ha-1 Bromoxynil + MCPA with net
benefit of Rs. 87117. It can be concluded that by the use of allelopathic crop water extracts herbicides use can be
reduced up to 50%.
