Abstract
Aim of the Study. Heavy doses of synthetic weed control chemicals have caused herbicide resistance in weeds. Natural com pounds produced by living organisms constitute a wide field for ecologically safe herbicides. The experiments were designed to test allelopathic potential of hexane extracts of selected plants against common weeds in agriculture viz. Euphorbia helioscopia, Rumex dentatus, Phalaris minor, Avena fatua and Chenopodium album. Materials and methods. Allelopathic potential of Carica papaya, Rhazya stricta, Lantana camara and Pinus roxburghii hexane extracts against weeds was determined at 100%, 75% and 50% concentration on soil, filter paper and agar. Parameters adopted for assessing allelopathic potential were the germination (%) and the length of seedling (cm). Data analysis was performed using the Statistica 9 software. Results and Conclusion. The results indicated that R. stricta, C. papaya, L. camara and P. roxburghii hexane extracts possesses suppression effects against weeds among which L. camara had the most conspicuous inhibition effects on selected weeds. The inhibitory effects of germination and seedling growth were in order R. stricta > L. camara > C. papaya > P. roxburghii. Field analysis to assess the phytotoxic ability of these species to be used as herbicide is recommended.
Highlights
Synthetic chemicals are widely used for weed control
Phytotoxic activity of R. stricta There was a substantial reduction in C. album germination (35 percent), R. dentatus (33 percent) and P. minor (32 percent), though there was no considerable impact on T. aestivum, E. helioscopia and A. fatua germination presenting opposition to the extract
Based on statistical data it was concluded that R. dentatus (44 percent) and A. fatua (40 percent) in R. strictaa n-hexane extract on filter paper exhibited the highest radicle size inhibition activity
Summary
Synthetic chemicals are widely used for weed control. These chemicals increase crop production, but at the same time they may have a detrimental effect on both the human health and the environment. The growth of weeds resistant to man-made weedicides is a major concern. Over the last few years, intensive use of herbicides to suppress weeds is becoming one of the world’s prominent ecological and environmental challenges. Residues of herbicides in seeds, underground water and soil that produce health threats and resistant biotypes are dangers that we face,while trying to develop different weed management techniques. Since synthetic chemicals pose negative impact, demand for new classes of chemicals may grow, biodegradable ones, such as plants that may grow as natural herbicides (Aryakia et al, 2015)
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