Mandeep Singh2017-03-212017-03-212010http://krishikosh.egranth.ac.in/handle/1/5810005589The field experiment entitled, “Integrated weed management in bed sown soybean (Glycine max (L.) Merrill)” was conducted at Punjab Agricultural University, Ludhiana during kharif 2009. The soil was loamy sand in texture with normal reaction, low in organic carbon and available N and medium in available P & K. The experiment was laid out in Randomized Block Design with four replications and twelve weed control treatments; imazethapyr 0.050 kg ha-1 and 0.075 kg ha-1 (30 DAS), imazethapyr 0.050 kg ha-1 (30 DAS) followed by HW (60 DAS), straw mulch 5 t ha-1 (2-3 DAS) followed by imazethapyr 0.050 kg ha-1 (30 DAS), oxyfluorfen 0.20 kg ha-1 and 0.30 kg ha-1 (2-3 DAS), oxyfluorfen 0.20 kg ha-1 (2-3 DAS) integrated with one HW 45 DAS and followed by straw mulch 5 t ha-1 (2-3 DAS), pendimethalin 0.45 kg ha-1 (2-3 DAS) integrated with one HW (40 DAS), straw mulch 5 t ha-1 (2-3 DAS), weed free and unweeded control. The highest seed yield (22.16 q ha-1) was recorded with combined application of straw mulch 5 t ha-1 followed by imazethapyr 0.050 kg ha-1 applied at 30 DAS which was statistically at par with combined application of oxyfluorfen 0.20 kg ha-1 followed by straw mulch 5 t ha-1, weed free and integration of one HW with application of the herbicides (oxyfluorfen 0.20 kg, imazethapyr 0.050 kg & pendimethalin 0.45 kg ha-1). Crop dry matter, plant height, LAI, PAR interception, leghaemoglobin content, branches per plant, pods per plant and 1000 seed weight were significantly higher with application of straw mulch 5 t ha-1 followed by imazethapyr 0.050 kg ha-1 applied at 30 DAS, application of oxyfluorfen 0.20 kg ha-1 followed by straw mulch 5 t ha-1, weed free and integration of one HW with application of the herbicides (oxyfluorfen 0.20 kg, imazethapyr 0.050 kg & pendimethalin 0.45 kg ha-1). Weed count, weed dry matter and nutrient removal by the weeds at harvest were significantly lower with application of straw mulch 5 t ha-1 followed by imazethapyr 0.050 kg ha-1 applied at 30 DAS, application of oxyfluorfen 0.20 kg ha-1 followed by straw mulch 5 t ha-1, weed free and integration of one HW with application of the herbicides (oxyfluorfen 0.20 kg, imazethapyr 0.050 kg & pendimethalin 0.45 kg ha-1). Significantly lower bacterial and fungal counts were obtained with the application of herbicides (oxyfluorfen, pendimethalin and imazethapyr). But actinomycetes showed resistance to oxyfluorfen at 0.20 kg ha-1. The antimicrobial effect of oxyfluorfen decreased at 45 DAS.ennullThesis