Effect of Nitrogen on the Growth and Yield of Local Aman Rice Cultivar

Abstract

To identify suitable nitrogen management practices for local fine and aromatic rice cultivars an experiment was carried out at Farmer’s field at Jointapur, Sylhet region of Bangladesh during the period from August 2017 to December 2017. The experiment was replicated thrice in randomized complete block design assigning factor A: rice cultivars viz. Beruin (V1), Moinasail (V2), Nagrasail (V3) and, BRRI dhan49 (Control, check variety) (V4) and factor B: N sources viz. N 100% chemical (F1) , 50% N from FYM + 50% from Urea (F2) , 50% N from Vermicompost+ 50% from Urea (F3) and farmers practice (F4). Nutrients P,K, S and Zn (100%) were supplied from chemical sources of triple super phosphate, muriate of potash, gypsum and zinc sulphate, respectively. Only N was supplied from different organic and inorganic (urea) sources. Fertilizers were applied at the rate of 140-33-38 kg ha-1 of NPK for farmers’ practice, 90-15-60-12-1 kg ha-1 N, P, K, S and Zn for the variety of BRRI dhan49 and 45-9-33-9-1 kg ha-1 N, P, K, S and Zn for 3 local rice varieties. The results indicate that, BRRI dhan49 (V4) gave the highest yield (2.97 t ha-1) among the varieties. Among the local varieties Nagrasail (V3) gave the highest yield (2.24 t ha-1). In case of farmers practice, highest grain yield was obtained F4 (3.50t ha-1) followed by F1 (2.32 t ha-1). Interaction effect also revealed, the highest grain yield (3.23 t ha-1) in (V4× F4). Among the local varieties Nagrasail gave highest grain yield (2.58 t ha-1) along with F4. Farmer’s practice fertilizer management is a promising option, and Nagrasailis the best one for local T. aman cultivars cultivation in Sylhet region of Bangladesh.