INFLUENCE OF NITROGEN SOURCES, VARIETY AND WEED CONTROL METHODS ON THE GROWTH AND YIELD OF AROMATIC T. AMAN RICE VARIETIES

Abstract

A field experiment was conducted at the experimental field of Sher-e-Bangla agricultural university during July to December 2013 to find out the effect of three sources of Nitrogen viz. control (N1), Prilled urea (N2) and USG (N3) and three weed control treatment viz control (W1), two hand weeding (W2) and pre-emergence herbicide Rifit 20EC (W3) on growth, yield and yield components of Kalijira (V1), BRRI dhan37(V2) and BRRI dhan38 (V3) transplant aromatic T. aman rice. The experiment was laid out in a split-split-plot design with three replications. Half of the urea applied at the time of final land preparation and rest half applied in two equal splits at 20 and 40 DAT. The USG (1.8 g) was placed at 5-10 cm soil depth at 10 DAT in the center of four hills in alternate rows @ 1 granule in one spot to supply 58 kg N ha-1 and Rifit 20EC was applied at 5 DAT. USG performed well in growth and gave higher grain yield (3.33 t ha-1) over PU. USG gave 18% more yield then Prilled urea. Results showed that rice varieties differed significantly in all growth characters and BRRI dhan38 produced higher grain yield (3.23t ha-1). Rifit 20EC applied plot gave highest grain yield (3.23 t ha-1) while no weeding had the lowest plant height, numbers of total tiller hill-1, CGR and total dry matter. Interaction results showed that significantly higher grain yields were given by PU X BRRI dhan38 (3.5 t ha-1), USG X BRRI dhan38 (3.82 t ha-1) and on the other hand, Rifit 20EC X BRRI dhan38 (3.71 t ha-1) and interaction of USG X BRRI dhan38 X Rifit 20EC (4.28 t ha-1). The higher grain yield was attributed mainly to the number of effective tillers hill-1, filled grains panicle-1 and 1000-grain weight.