ALLELOPATHIC POTENTIAL OF SOME WEEDS IN THE RICE FIELDS OF THE KOCHANI REGION

Abstract

During the period 2021-2022, the allelopathic effect of three weed species Scirpus mucronatus L., Scirpus maritimus L. and Heteranthera reniformis Ruiz & Pav. was studied under laboratory conditions at the Institute of Forage Crops, Pleven from the rice fields in the Kochani region and determining the allelopathic tolerance of four rice varieties Ronaldo, Opale, San Andrea and Halilbay grown in the Republic of Macedonia. It was established that the developed in vitro test ensures the obtaining of reliable results for the allelopathic effect of S. mucronatus, S. maritimus and H. reniformis and the allelopathic tolerance of the Ronaldo, Opale, San Andrea and Halilbay rice cultivars included in the study. The use of agar-gel as a carrier of allelochemicals and development environment has sufficient water supply and compacted structure to support the optimal development of the accessions included in the experiment development index (GI_%) varied from 21.5 to 129.2%) and proof of allelopathic interference in rice. In terms of allelopathic tolerance to weed species, rice varieties can tentatively be ranked in the following order: Halilbay (GI_{% average} 47.5%) → Ronaldo and Opale (GI_{% average} 62.3%) → San Andrea (GI_{% average} 94.1%).