Combined allelopathic effect of buckwheat and marsh pepper residues on weed management and crop performance of transplant aman rice

Abstract

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from June to December 2016 to evaluate the suppression of weed growth through combined application of buckwheat and marsh pepper residues in transplant aman rice. The experiment consisted of three cultivars i.e. BRRI dhan56, Binadhan-12 and Nizershail, and five different crop residues with their combination such as no residues, 2.0 t ha^-1 buckwheat residues, 2.0 t ha^-1 marsh pepper residues, combined 0.5 t ha^-1 buckwheat and 1.0 t ha^-1 marsh pepper residues, combined 1.0 t ha^-1 buckwheat and 0.5 t ha^-1 marsh pepper residues. The experiment was laid out in a randomized complete block design with three replications. Weed population and weed dry weight were significantly affected by cultivars and crop residues treatment. The maximum weed growth was noticed with no residues treatment and the minimum was found in combined 0.5 t ha^-1 buckwheat and 1.0 t ha^-1 marsh pepper residues. The grain yield as well as the yield contributing characters produced at BRRI dhan 56 was the highest among the studied varieties. The highest reduction of grain yield was obtained in no residues) treatment and the lowest was obtained when combined 0.5 t ha^-1 buckwheat and 1.0 t ha^-1 marsh pepper residues were applied. The highest numbers of effective tillers hill^-1, number of grains panicle^-1, 1000-grain weight, and grain and straw yields were observed in W₃ treatment. BRRI dhan56 under 0.5 t ha^-1 buckwheat and 1.0 t ha^-1 marsh pepper residues treatment produced the highest grain yield. Results of this study indicates that combination of 0.5 t ha^-1 buckwheat and 1.0 t ha^-1 marsh pepper residues showed potentiality to suppress weed growth. Therefore, crop residues could be used as an alternative tool for sustainable weed management.