Allelopathic Potential of Wheat (<i>Triticum aestivum</i>) Straw on Selected Weed Species

Abstract

The allelopathic potential of wheat [ Triticum aestivum (L.) ‘Doublecrop′] straw residue was evaluated on weed-seed germination and seedling growth. The inhibition of weed-seed germination and seedling growth was extract-, species-, and temperature-dependent. The extracts prepared by agitating and soaking caused greater inhibition than those obtained by leaching. The descending order of species susceptibility was ivyleaf morningglory [ Ipomoea hederacea (L.) Jacq.], velvetleaf ( Abutilon theophrasti Medic.), pitted morningglory ( Ipomoea lacunosa L.), hemp sesbania [ Sesbania exaltata (Raf.) Cory], sicklepod ( Cassia obtusifolia L.), and Japanese barnyard millet [ Echinochloa crus-galli var. frumetaceae (Roxb.) Link]. Incubation at 35 C caused the greatest inhibition of germination and growth.