Weed Growth Observation in Transplant Aman Rice Field as Influenced by the Organic Manures and Fertilizers with Rice Straw Allelopathy

Abstract

The present experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh from June 2022 to November 2022 to estimate the combined effect of manures and fertilizers with the rice straw allelopathy on the weed growth of transplant aman rice season. It had two cultivars viz., BRRI dhan71 (V1), and BRRI dhan49 (V2) and eight treatments comprising with rice straw, manures and fertilizers (t ha-1): Control (T1), Recommended doses of NPKS (T2), Rice straw 1.5 t ha-1 + Cow dung 5 t ha-1 (T3),  Rice straw 1.5 t ha-1 + Cow dung 2.5 t  ha-1 + 50% less of recommended doses of NPKS (T4 ), Rice straw 1.5 t ha-1 + Vermicompost 5 t ha-1 (T5) , Rice straw 1.5 t ha-1 + Vermicompost 2.5 t ha-1 + 50% less of recommended doses of NPKS (T6), Rice straw 1.5 t ha-1 + Trichocompost 10 t ha-1 (T7), Rice straw 1.5 t ha-1 + Trichocompost 5 t ha-1 + 50% less of recommended doses of NPKS (T8) and was laid out in a randomized complete block design (RCBD) with three replications.  Nine weed species belonging to four different families infested the experimental plots. Weed population and weed dry weight were significantly affected by treatments. The maximum weed growth was obtained from Control (T1) while the minimum was found in (T6). Results of this current study indicate that combination of rice straw with manures and fertilizer showed potentiality to inhibit weed growth and enhances the yield of transplant aman rice. Therefore, combination of rice straws with manures and fertilizers could be a potential package of sustainable and eco-friendly weed management and yield enhancement element for the nearest year’s crop production.