Effect of Nitrogen Doses in Boro Rice Grown with Variable Levels of Floating Duckweed

An experiment was carried out at the Agronomy Research Farm of Sher-e-Bangla Agricultural University, Dhaka during period from November 2018 to June 2019 study nitrogen requirement boro rice grown with floating duckweed. The laid in a Factorial Randomized Complete Block Design three replications. treatments were duckweed: viz. D0 = Control (0 g duckweeds m-2), D1 200 m-2, D2 400 m-2 and D3 600 m-2) treatment: N1 45 kg N ha-1, N2 90 ha-1 N3 180 ha-1). Different doses showed significant influence on most parameters which (400 treatment best performance growth yield rice. Among different nitrogen, (90 ha-1) gave results In case combined effect, D2N2 highest number tillers hill-1 (16.40), dry weight (48.97 g), effective (14.73) grains panicle-1 (189.50). This combination also filled (183.90), panicle length (25.83 cm), 1000 -grain (25.13 seed (7.24 t ha-1), straw (8.47 biological (15.71 harvest index (46.09%). On other hand, D0N3 least these parameters. Findings revealed that application superiority over combinations produce higher grain rice.
 Bangladesh Agron. J. 2022, 25(2): 109-117