ABSTRACT

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during July to November, 2019 with a view to finding out the effect of variety and nitrogen and potassium management on yield and yield attributes of transplant aman rice. The experiment comprised of two rice varieties viz. BRRI dhan34 and BRRI dhan49 and six levels of nitrogen and potassium  management viz. F1-Recommended rate of fertilizer (Control), F2-Recommended rate + 25% additional Nitrogen at 7 days after panicle initiation (DAPI), F3-Recommended rate + 25% additional potassium at 7 DAPI, F4-Recommended rate + 25% additional Nitrogen + 25% additional potassium at 7 DAPI, F5-Recommended rate + foliar spray of 2% urea & 1% MoP at 7 DAPI and F6-Recommended rate + foliar spray of 2% urea &1% MoP at 7 and 14 DAPI. The results of the experiment revealed that the main effect for varieties and nitrogen and potassium management were significant for grain yield but not significant due to the interaction between variety and nitrogen and potassium management.  BRRI dhan49 gave the higher yield (7.13 t ha-1) than BRRI dhan34 (5.38 t ha-1). In respect to nitrogen and potassium management, the highest grain yield (7.34 t ha-1) was obtained with recommended rate + 25% additional nitrogen+25% additional potassium at 7 DAPI which was statistically similar with other treatments  and the lowest (5.42 t ha-1) was found with recommended rate of fertilizer. Therefore, it may be concluded that the maximum yield of rice variety BRRI dhan34 and BRRI dhan49 could be obtained by applying additional 25% nitrogen and 25% potassium at 7 DAPI in addition to the recommended rates of fertilizers.

Key words: Nitrogen, potassium, yield, transplant aman rice.