Allelopathic Effect of Echinochloa colona L. and Cyperus iria L. Weed Extracts on the Seed Germination and Seedling Growth of Rice and Soyabean

Abstract

The present study was undertaken to assess the allelopathic effect of Echinochloa colona L. and Cyperus iria L. in relation to the germination and primary growth of Oryza sativa L. (rice) and Glycine max L. (soyabean). Effects of dichloromethane (DCM) and double distilled water soluble (DDW) fractions of E. colona L. and C. iria L. root and aerial part extracts reduced germination and suppressed early seedling growth of rice and soyabean. With increase in extract concentration from 1 to 100 mg/mL, a gradual decrease in seed germination and seedling length occurred. The highest growth of G. max seedling was recorded in DDW fraction of E. colona aerial part extract at 1 mg/mL concentration with 94% germination and the lowest length was found in DCM fraction of C. iria root extract at 100 mg/mL concentration with 65% germination. In O. sativa, the highest length was noted at 1 mg/mL concentration in DDW fraction of E. colona aerial part extract with 82% germination and the lowest length was found in DCM fraction of C. iria and E. colona root extracts with germination 57% and 62%, respectively, at 100 mg/mL concentration. The results suggested that these weeds had good allelopathic potential which reduces germination and plant growth.

Allelopathic Effects of Sphaeranthus suaveolens on Seed Germination and Seedling Growth of Phaseolus vulgaris and Oryza sativa

“…ese results are in agreement with the study conducted by [42,43] on the allelopathic effects of various weeds on seed germination of rice and beans where germination was reduced to 20% and 6%, respectively. e…”

Allelopathic Potential of Etlingera coccinea (B.) Sakai & Nagam on Seed Germination and Growth of Mung Bean and Siam Weed

“…This experiment was done in triplicate. Germination percentage was calculated by the following equation [13].…”

Las malezas, plantas incomprendidas

“…La utilización de esta estrategia para la supresión de las malezas parece ajustarse a la mayoría de los requisitos ecológicos, económicos y energéticos para este nuevo enfoque de manejo del agroecosistema (Altieri & Doll, 1978). La investigación agrícola moderna ha incrementado los esfuerzos en documentar el potencial alelopático que las propias malas hierbas ofrecen para el manejo integrado de otras especies espontáneas en las áreas cultivadas, utilizando tasas de herbicidas sustancialmente reducidas (Belz, 2007;Chopra, Tewari, Tewari, Upreti, & Pandey, 2017). Dentro de lo cual encontramos ejemplos como el uso de extractos de malezas para el control Euphorbia dracunculoides Lam (Khaliq, Matloob, Tanveer, Abbas, & Khan, 2012), extractos de Crotalaria juncea L. para la inhibición de la germinación de Stemodia durantifolia y Cyperus rotundus L. (Jarma, Angulo, Jaramillo, & Hernandez, 2004), e incluso el uso de malezas acuáticas (Abbas et al, 2017) Explorar todos los beneficios de las malezas, es una ardua labor.…”