Allelopathic effects of Chenopodium album, Amaranthus retroflexus and Cynodon dactylon on germination and growth of safflower
According to the importance and diversity of Chenopodium album, Cynodon dactylon and Amaranthus retroflexus in safflower fields and significant role of safflower (Carthamus tinctorius L.) as an oil seed, an experiment was conducted using CRD based factorial design with three replications to study the allelopathic effects of root and shoot extracts of these weeds on germination and early growth stages of safflower in 2006. Analysis of variance at germination stage showed that main and interaction effects on germination %, seedling length, dry weight, coefficient of germination rate and germination time were significant. Root and shoot extracts of Amaranthus retroflexus, shoot extract of Chenopodium album and root extract of Cynodon dactylon inhibited germination entirely. The extract of the rest of weed decreased at least 52.5% seedling dry weight and near 80% germination percentage. In greenhouse experiment the effect of weed type on height, root and shoot dry weight, leaf area and biomass was significant. Different parts of weeds showed highly significant effect on all attributes. Interaction effects of weed type x weed part had significant impact on root dry weight, leaf area and biomass. Chenopodium album had the most impact on decreasing root and shoot dry weight, root length and biomass. Amaranthus retroflexus also caused high reduction of safflower height and leaf area. Weed extracts significantly decreased plant height at least 19.07% and root dry weight as highest 92.5% in compare with control. This research clearly showed that the weeds disturbed the safflower germination and growth by producing allelopathic compounds and caused reduction in crop establishment.
Inhibitory Effect of Hydroalcoholic Extracts of Caltrop (Tribulus terrestris L.) on Germination and Growth of Avena fatua L., Chenopodium album L., Setaria viridis L. and Amaranthus retroflexus L.
Background: The use of allelopathic plant extracts as herbicide is being popularized in recent years. Objective: This research has been conducted to evaluate the allelopathic potential of caltrop (Tribulus terrestris L.) on seed germination and growth of Avena fatua L., Chenopodium album L., Setaria viridis L. and Amaranthus retroflexus L. Methods: This research was done to evalature the ef...متن کامل
Allelopathic effects of rhizome aqueous extract of Cynodon dactylon L. on seed germination and seedling growth of Legumes, Labiatae and Poaceae Homa Mahmoodzadeh* and Mitra Mahmoodzadeh
Allelopathic effects of aqueous extract of rhizomes of Cynodon dactylon L. were studied on seed germination and seedling growth of three legume crops (Phaseolus vulgaris L., Pisum sativum L., and Vicia faba L.), three Labiatae species (Thymus vulgaris L., Melissa officinalis L., and Mentha spicata L.), and two species of Poaceae (Avena fatua L., Sorghum halepense L.). Seed germination of all L...متن کامل
Monoterpenes, the chemical constituents of essential oils found in plants, are known biologically active compounds. The present study was conducted to investigate the inhibitory effects of 30 monoterpenes including monoterpene hydrocarbons and oxygenated monoterpenes on seed germination and seedling growth of Amaranthus retroflexus, Chenopodium album and Rumex crispus under laboratory condition...متن کامل
Potential of olive mill waste and compost as biobased pesticides against weeds, fungi, and nematodes.
The phytotoxic and antimicrobial properties of olive mill wastes have been widely investigated and demonstrated over the past decade. However, their potential utilization as biodegradable pesticides against plant pathogens is still poorly understood. In this study, a series of laboratory bioassays was designed to test the inhibitory effects of sterile water extracts of two-phase olive mill wast...متن کامل
N deposition affects allelopathic potential of Amaranthus retroflexus with different distribution regions.
This study aims to determine the allelopathic potential of Amaranthus retroflexus (Ar) with different climatic zones on seed germination and growth of A. tricolor (At) treated with a gradient N addition. Ar leaf extracts only displayed significantly allelopathic potential on the underground growth of Ar but not the aboveground growth of At. The allelopathic potential of Ar leaf extracts on root...متن کامل