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Kavitha, D. and J. Prabhakaran* Department of Botany, Annamalai University, Annamalai Nagar 608 002, Tamil Nadu. *E.mail: drprabha2006@gmail.com In agricultural systems, allelopathy can be part of the interference between crops and between crops and weeds through soil mediated mechanism and thereby affecting the economical outcome of the plant production. Allelopathic influence of various concentrations of aqueous extracts of two weed species ie.Cyperusrotundus L. and Cynodan dactylon L. were assessed on physico-chemical and biological properties of rice seedlings grown experimental pot soil. The results revealed that the percentage of NPK levels was minimum in the lower concentrations of two weed extracts than their higher concentration. Among NPK contents, the nitrogen was found higher percentage followed by potassium and phosphorus in all the experimental soil. The population of bacterial, fungi, actinomycetes and total microbial populations were gradually decreased with increasing the concentration of weed extracts and more reduction on microbes was found in C.rotundus than C.dactylon applied soil

ALLELOPATHIC INFLUENCE OF CYPERUS ROTUNDUS L. AND CYNODAN DACTYLON L. ON PHYSICO- CHEMICAL AND BIOLOGICAL PROPERTIES OF SOIL