Assessment of combined effect of Eleocharis atropurpurea and Fimbristylis dichotoma residues on the yield performance of T. aman rice

Abstract

The current agricultural system is seeking a biological solution to lesson hazardous impacts from the use of chemicals to control weeds in rice production. Plant allelopathy is one of the ways where allelopathic plant inhibits its surrounding plants by releasing allelopathic substances. The present experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from July to December 2019 to study the allelopathic effects of the and residues of Eleocharis atropurpurea and Fimbristylis dichotoma on weed management and the yield performance of aman rice. The field experiment consisted of three rice varieties i.e BRRI dhan34, Nizershail and Kalozira and five treatments such as 0, 1.0, 2.0, 3.0 t ha-1 and farmer’s practices. The experiment was laid out in a randomized complete block design (RCBD) with three replications. The highest grain yield (4.44 t ha-1) as well as the yield contributing character was recorded in Kalozira and the lowest grain yield (3.94 t ha-1) was obtained in the BBRI dhan34. The highest number of effective tillers hill-1, number of grains panicle-1, 1000-grain weight, grain and straw yields were observed when the residue of E. atropurpurea and F. dichotoma was applied at 3 t ha-1. Rice cultivar kalozira with the incorporation of E. atropurpurea and F. dichotoma residue at 3 t ha-1 produced the highest grain yield (5.08 t ha-1) and straw yield (6.77 t ha-1). Results of this study indicate that E. atropurpurea and F. dichotoma residue showed potentiality to inhibit weed growth and it has a significant effect on yield of aman rice.