AGRICULTURE, LIVESTOCK and FISHERIES EFFECT OF VARIETY AND NITROGEN FERTILIZER MANAGEMENT ON THE GROWTH AND YIELD OF TRANSPLANT AMAN RICE

Varietal selection and appropriate placement of nitrogen fertilizer could reduce the magnitude of nitrogen losses to a considerable extent and improve its use efficiency for better grain production. An experiment was carried out during the period from July to December at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh to evaluate the effect of variety and nitrogen fertilizer management on the growth and yield of transplant aman rice. The treatments consisted of three varieties viz. BR11, BRRI dhan49 and Binadhan-7, and five nitrogen fertilizer managements viz. two depth of placement of USG (Urea Super Granule) and three split applications of prilled urea. The experiment was laid out in a randomized complete block design with three replications. The results showed that the effect of variety and nitrogen fertilizer management significantly influenced all the yield contributing grain yield the cm depth of USG. The highest grain - the interaction of with the 6 cm depth of placement of USG. It may be concluded that with 6 cm depth of of the to maximize the yield of transplant aman rice. Variety and nitrogen fertilizer management had significant influence on T. aman rice. Plant characters like plant height and number of tillers hill -1 showed significant variation at different growth stages. The highest results was found in 75 DAT and this results collaborates the findings of Kirttania et al. (2013), Azam et al. (2012) and Vijaya and Subbaiah (1997).Varietal difference may due to different genetic makeup and variation among different nitrogen managements may due to nitrogen availability at different nitrogen application methods. Most of the plant characters like plant height, effective tillers hill -1 , number of grains panicle -1 , number of grains hill -1 showed the highest performance in the interaction of Binadhan-7 with 6 cm depth of placement of USG. Those result partially similar with the findings of Mohammad et al. (2014) and Hasan et al. (2002). USG method showed better result than split application of urea due to less nutrient loss and more availability of nitrogen for plant. The highest number of effective tillers hill -1 , number of grains panicle -1 and the highest 1000-grain weight were responsible for the highest yield. Depth of placement of USG and split application of prilled urea show significant variation on total number of effective tillers hill -1 .The highest grain yield in USG placement at 6 cm occurred due to the highest number of grains panicle and the highest number of effective tillers hill -1 . Nitrogen fertilizer management had also highly significant influence on the number of straw yield. Similar results were recorded by Hasanuzzaman et al . , 2009. The highest grain yield and straw yield subsequently results the highest biological yield and harvest index. The results of the present study suggest that transplanting of Binadhan-7 in combination with 6 cm depth of placement of USG appeared as the promising practice in transplant aman rice cultivation and binadhan-7 was found to be promising rice variety in terms of grain yield.