Allelopathic Potential of Wheat (Triticum aestivum) Straw on Selected Weed Species

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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.