Abstract
A three phase study was conducted for the determination of phytotoxic effect of Astragalus spp. (milkvetch or goat's-thorn)
on the emergence and seedling growth of chickpea. In phase I, Astragalus whole plant, leaf, stem, fruit and root aqueous
extracts were tested for their effect on chickpea seed germination. In phase II, and III different concentrations (1,2,3, 4 and
5%) of Astragalus leaf extract were tested for their phytotoxic influences on the emergence and early seedling growth of
chickpea. Distilled water was applied as control treatment. Each experiment was conducted under completely randomized
design (CRD). All extracts significantly inhibited the germination energy, germination index, caused delay in time to 50%
emergence and mean emergence time of chickpea. Leaf aqueous extract application considerably reduced the root and shoot
length and dry weight. P-coumeric, ferrulic, hydroxy, caffeic acid, meth oxybenzoic acid and syringic acid were the
phytotoxins detected in leaf extract of Astragalus spp. Vanillic acid and syringic acid were determined in fruit extract. Pcoumeric, M-coumeric acid and syringic acid were observed in root extract. Whereas, ferrulic, caffeic acid, M-coumeric acid
and syringic acid were found in whole plant extract of Astragalus spp. ThusAstragalus species infestation in
chickpeareleases allele chemicals in the rhizospherethat may cause poor germination and growth of chickpea.
Rao Muhammad Ikram, Asif Tanveer, Rizwan Maqbool, Ahsan Aziz , Muhammad Ather Nadeem, Mubashar Nadeem, Ali Raza, Tasawer Abbas. (2020) POTENTIAL ALLELOPATHIC IMPLICATIONS OFA RAIN-FED WEED ASTRAGALUS SPP. ON CHICKPEA CROP, Pakistan Journal of Agricultural Sciences, Volume 57, Issue 6.
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