Repeated application of herbicide mixtures effect on weeds

Abstract

The experiment was conducted at research farm of the Department of Horticulture, CCS Haryana Agricultural University, Hisar during the year 2016 to assess the effect of repeated application of herbicides on yield of Kinnow. Weeds exert their competition for light, water, nutrients and interfere with other operational factors and also form potential breeding niche for various insect, pest and diseases which affect the plant growth and ultimately the yield. The treatments comprising eleven levels viz., control, spray of glyphosate (1%) + pendimethalin (1 kg/ha) in April, spray of paraquat (0.6%) + pendimethalin (1 kg/ha) in April, Spray of glyphosate (1%) + pendimethalin (1 kg/ha) in April and June, spray of paraquat (0.6% + pendimethalin (1 kg/ha) in April and June, spray of glyphosate (1%) + pendimethalin (1 kg/ha) in April, June and August, spray of paraquat (0.6%) + pendimethalin (1 kg/ha) in April, June and August, spray of glyphosate (1%) + pendimethalin (1 kg/ha) in April, June, August and October, spray of paraquat (0.6%) + pendimethalin (1 kg/ha) in April, June, August and October, Mechanical weeding in April and August and Mechanical weeding in April, July and September which were laid out in a randomized block design. The maximum visual mortality of weeds at 60, 120 and 180 DAT and least weed density, fresh weight of weeds and dry weight of weeds was registered with the treatment glyphosate 1% + pendimethalin 1kg/ha in April, June, August and October at all intervals.