EXPLORING THE PHYTOTOXIC EFFECTS OF Glycyrrhiza glabra L. ON EMERGENCE AND SEEDLING GROWTH OF Pisum sativum L.

Chemical weed control method may cause environmental hazards and residual effects in crops and soil. Alternate approach to control weeds is getting attentions in sustainable production system. Use of aqueous extracts of crops is getting scientific attention as eco-friendly alternative to synthetic herbicides especially under scenario of fast increasing herbicide resistance in weeds. Therefore, the present study was conducted at Weed Science Laboratory, Department of Agronomy, University of Agriculture, Faisalabad during winter 2018 to determine the phytotoxic effects of Glycyrrhiza glabra on winter vegetable crop Pisum sativum. The experiments were laid out under a completely randomized design (CRD), having three replicates. The experiments comprised of seven treatments with different concentrations of extract. The wood of G. glabra extracts comprised 0%, 0.25%, 0.5%, 10%, 20%, 40%, and 80% concentration applied on Pisum sativum. Data on seed germination, root length, shoot length, and fresh weight of weed and pea was recorded following standard procedures. Data were analyzed using Fishers Analysis of Variance. The differences among treatments were separated using a least significant difference test (LSD). Results revealed that aqueous extracts were possessed phytotoxic chemicals that cause phytotoxic effect to P. sativum and result in maximum germination percentage (%), Mean Germination time (Days), Time to 50% germination and minimum, root length (mm), shoot length (mm), root fresh weight (mg), shoot fresh weight was recorded at 80 % concentration of G.  glabra.  It is concluded that there are phenolic compounds in the wood extract of G. glabra which cause allelopathic effects on P. sativum.