Intercropping effect on weed infestation in wheat.
The efficiency of intercropping different upland crops with wheat to reduce weed populations was investigated in Mymensingh, Bangladesh. A wheat monoculture control was compared with wheat intercropped with chickpeas, lentils and peas. No weeding was done in any treatment. Weed populations and biomass production (dry weight) were recorded at 21, 42 and 63 days after sowing (DAS) and Chenopodium album, Paspalum distichum, Vicia sativa, Hedyotis corymbosa and Physalis minima were found to be the most important weeds. At 21 DAS, there were no differences in weed population and biomass production among the treatments, but both were significantly reduced by intercropping at 42 and 63 DAS. Wheat + chickpeas, wheat + lentils and wheat + peas reduced the total weed population by 26, 12 and 28% and weed biomass by 31, 13 and 27%, respectively, compared to the wheat monoculture. Wheat + chickpeas reduced C. album and H. corymbosa populations by 31 and 28% and their biomass by 36 and 56%, respectively. Wheat + peas reduced C. album and H. corymbosa populations by 29 and 57% and their biomass by 36 and 65%, respectively. The wheat + lentil intercrop was a comparatively poor weed suppressant.