International Journal of Environmental Sciences

Volume 3 Issue 1 2012- July 2012        Pages: 84- 97               <<Previous    Next>>

Allelopathic influence of dominant weeds of North-Western Himalayan region on common cereal crops

Author Information:

Rajan Katoch1, Anita Singh1, Neelam Thakur2
1- Department of Crop Improvement, College of Agriculture, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur (H.P.) – 176 062 (India)
2- Department of Biosciences, Punjab Agricultural University, Ludhiana, India


A study on the allelopathic potential of Ageratum conyzoides and Eupatorium adenophorum two dominant weeds of North-Western Himalayan region on three common cereals viz., Triticum aestivum cv. HPW-42 (wheat), Oryza sativa cv. Hasanshrai basmati (paddy) and Zea mays cv. Girija (maize) revealed significant inhibition of  seed germination. Lower concentration of E. adenophorum macerated aqueous extract showed stimulatory effect on plumule growth in wheat and maize seedlings while all other treatments led to inhibition of plumule length. Likewise, the radicle length was significantly more in case of maize seedlings on exposure to E. adenophorum macerated aqueous extract (50 per cent) than that of control. All other treatments caused significant reduction in the radicle growth. The inhibitory effect was much pronounced for radicle growth as compared to the plumule growth for all the treatments except E. adenophorum macerated aqueous extract (50 per cent). There was a significant reduction in seed vigor index in case of all the treatments except E. adenophorum macerated aqueous extract (50 per cent). Among the test crops, maize with larger seeds was least sensitive to the application of various extracts/fractions while wheat and paddy with small seeds were more susceptible to the allelopathic effect of both weeds. The results of the study could be important in planning the area under different crops in view of the prevalent agro-ecosystem for better outputs.

Keywords: Ageratum conyzoides, Eupatorium adenophorum, wheat, paddy, maize, plant extracts.

DOI: 10.6088/ijes.2012030131010

© 2012 Copyright by the authors, licensee Integrated Publishing Association.This is an open access article distributed under the Creative Commons Attribution License (3.0) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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