Open Access Research Paper Views (986) Allelopathic effect of Arta (Calligonum Comosum L, Her) extract on seed germination of arfaj (Rhanterium epapposum Oliv) Modhi Al-Otaibi Int. J. Agron. & Agric. Res. 5(3), 75-79, September 2014. Keywords: Allelopathic effect, Calligonumcomosum, Rhanteriumepapposum Details