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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Sep 2012, 33 (5)                                     Back


nstantaneous and historical temperature effects on a-pinene

Evaluations of allelopathic effect of Echinochloa colona weed

on rice† (Oryza sativa L. ĎVandanaí)

 

Author Details

 

D. Swain

(Corresponding author)

Crop Improvement Division, Central Rice Research Institute (ICAR), Cuttack-753 006, India

e-mail : †dr_dswain@yahoo.com

Seema Paroha

Crop Improvement Division, Central Rice Research Institute (ICAR), Cuttack-753 006, India

Monika Singh

Crop Improvement Division, Central Rice Research Institute (ICAR), Cuttack-753 006, India

H.N.Subudhi

Crop Improvement Division, Central Rice Research Institute (ICAR), Cuttack-753 006, India

 

 

 

 

Publication Data

Paper received:

25 October 2010

 

Revised received:

19† September 2011

 

Re-revised received:

29† November 2011

 

Accepted:

12† December 2011

 

 

Abstract

Echinochloa colona (L.) Link†† is a very problematic weed in up land and medium land rice causing significant reduction in yield. In the present investigation, laboratory and field experiments†† were conducted to evaluate the nature of interaction E. colona on germination and growth†† of the up land rice cultivar ĎVandanaí. The effects of decomposing and decomposed aqueous leachates (1-10%w/v) obtained from the dried biomass of 20, 30, 40 and 60 days old† E.colona†† plants† were studied on rice using petridish bioassay technique with†† three different types of culture media like filter paper, soil,† and soil + activated charcoal.† The decomposing leachates of E. colona†† showed strong toxic effect on root and shoot growth of rice, the highest being noted with 10% leachates of 60 days old plant residue. It inhibited root and shoot growth by 100% and 43.9% respectively as compared to control. The corresponding decomposed leachates inhibited rice germination by 90% and root and shoot growth by 70 and 25% respectively. These toxic effects of leachates showed in filter paper medium were significantly reduced in soil and soil plus activated charcoal media proving their allelopathic nature. In a field experiment, E. colona and rice were grown in proportions of 1:1, 1: 2 and 1:4, the total plant density being maintained at 100 pants m-2.† The height and dry matter of rice were adversely affected with increasing in E. colona population. From another similar†† field trial, data on dry matter of†† 20, 30, 40, and 60 days old plants were taken and their plant relative yield (PRY) and relative yield total (RYT) values were calculated. The PRY and RYT values were found to be less than unit (<1) throughout the growth period studied which suggested the presence of severe antagonistic interspecific interaction between rice and E.colona due to allelopathy.

Key words

Oryza sativa, Echinochloa colona, Upland rice, Allelopathy

 

Copyright © 2012 Triveni Enterprises. All rights reserved. No part of the Journal can be reproduced in any form without prior permission.¬†Responsibility regarding the authenticity of the data, and the acceptability of the conclusions enforced or derived, rest completely with the author(s).