ALLELOPATHIC INTERFERENCE OF WEEDS ON BROWN MUSTARDIN POT CULTUREHarish Kumar Tiwari and P.N. Dongre
A pot culture experiment was conducted at the Department of Botany, K.N. Government Post GraduateCollege Gyanpur, Uttar Pradesh coinciding with the Kharif season (July-October) of 2009. The treatmentsfor the growth of test plant T-59 of mustard (Brassica compestris var. dichotoma.) consisted of Aqueous extractsof 4 weeds, viz., Amaranthus viridis, Eclipta alba, Parthenium hysterophorus, and Phyllanthus niruri inconcentration of 2% (C1), 4%(C2) and Control (C0). Observation on root length, shoot length, leaf area, rootbiomass and shoot biomass were recorded by harvesting method at an interval of 30, 60 and 90 DAT (daysafter treatment). Result of the pot culture experiment indicate that the leaf extracts of all the four test weedspecies, viz.; Amaranthus viridis, Eclipta alba, Parthenium hysterophorus and Phyllanthus niruri had a significantretarding effect on growth of mustard var. T-59 at both C1 and C2 treatment level at all sampling dates (30,60 and 90 days after treatment). All the test parameters considered in the study, viz., root length, shootlength, total plant length, leaf area, root biomass, shoot biomass and total biomass were found to besignificantly affected by weed leaf extracts and such effect was found to be concentration dependant. Thenet primary productivity (NPP) and relative growth rate (RGR) values were found to be affected by treatmentof different concentration of weed leaf extracts of all the test weeds.