5-1-4-Rahman et al


M. A. Rahman, J. A. Mahmud* and M. M. Islam*
*Corresponding Author’s Email: mahbubislam_sau@yahoo.com, jamahmud_bd@yahoo.com

A field experiment was conducted at the Sher-e-Bangla Agricultural University Farm, Dhaka, Bangladesh during the rabi season from October 2010 to April 2011 to evaluate the combined use of nitrogen (N) and mulching (M) on the growth and yield of onion (Allium cepa) cv. Taherpuri. The experiment was carried out with the application of four levels of nitrogen viz: 0 (N0); 60 (N60); 120 (N120) and 180 (N180) kgha-1 and three types of mulching such as no mulch or control (M0), rice straw (Ms) and water hyacinth (Mw) with the following 12 treatment combinations N0M0, N0Ms, N0Mw, N60M0, N60Ms, N60Mw, N120M0, N120Ms, N120Mw, N18oM0, N180Ms, N180Mw. This was laid out in randomized complete block design (RCBD) with three replications. The results revealed that the maximum plant height and number of leaves per plant were found in N180Mw and N120Mw treatment combination whereas minimum plant height and number of leaves were found  in control. The yield components and yield such as bulb diameter, individual bulb fresh weight and bulb yield were also significantly influenced by the combination of N and M. The highest bulb diameter and individual bulb fresh weight were obtained from N120Mw treatment and minimum values were observed in N0M0, control condition. The treatment combination N120Mw was found the best bulb yield (12.20 tha-1) provider whereas control (N0M0) showed the lowest yield (5.99 tha-1). Treatment  N120Mw gave 103% higher bulb yield compared to control (N0M0).

Key words: Onion, Nitrogen, Mulching, Growth, and Yield

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