The allelopathic effects of extract and wheat residue (Triticum aestivum) rates on prostrate pigweed (Amaranthus bilituides) and common lambsquarters (Chenopodium album)

In order to evaluate the allelopathic effect of wheat residue extracts and different rates of it on prostrate pigweed (Amaranthus blituides) and common lambsquarter (Chenopodium album) germination and seedling growth, four separate experiments were carried out on a completely randomized design with four replications in Laboratory of Agronomy and Plant Breeding of Birjand University. Treatments included the extracts of wheat residue in 5 levels [0(control), 25%, 50%, 75% and 100%] and the different rate of wheat residue in 5 levels [0(control), 1250, 2500, 3750 and 5000kgh-1 residue]. Results indicated that all studied traits of prostrate pigweed and common lambsquarter were significantly affected by different concentrations of wheat residue extracts and different rates of it. By increasing the concentration of extract and rate of residue, germination percentage, germination rate, seedling weight, radicle weight, plumule weight, radicle length, and plumule length significantly decreased. Results showed that extracts of wheat residue had a more inhibitory effect on the vegetative growth than their germination in both weeds. Also, root length was more sensitive than shoot length to wheat residue extract. Common lambsquarters were more sensitive than prostrate pigweed. Results showed allelopathic effects of wheat residue can be used for weed management.