Effect of Nitrogen Level and Plant Spacing on Production Parameters of Boro Rice (cv. BRRI dhan28)

Abstract

A field experiment was conducted in the Agronomy Field Laboratory of Bangladesh Agricultural University, Mymensingh, Bangladesh during the period from December 2017 to April, 2018 to study the effect of different nitrogen level and spacing on the growth, grain yield and yield component and to determine their economic feasibility of BRRI dhan28 under irrigated conditions. The experiment comprised of Levels of nitrogen (4 levels); N1: 50% of recommended dose (60 kg N ha-1), N2: 100% of recommended dose (120 kg N ha-1),   N3: 125% of recommended dose (149 kg N ha-1) and N4: 150% of recommended dose (179 kg N ha-1) and Plant  spacing (4 levels); S1: 15cm × 15cm, S2: 20cm × 15cm (Recommended by BRRI), S3: 25cm × 15cm and S4: 20cm × 20cm. The experiment was laid out in a randomized complete block design (RCBD) with three replications. The land was classified as medium-high, with non-calcareous dark-grey floodplain soil of silty loam texture. Data revealed that the tallest plant at the time of harvest. The highest plant height (109.1), number of total tillers hill-1 (17.88), number of effective tillers hill-1 (16.65), number of grains panicle-1 (85.23), grain yield (5.147 t ha-1), straw yield (6.857 t ha-1) and biological yield (12.00 t ha-1) were found in the treatment combination N3S4. So, the experiment showed that application of nitrogen 125% of recommended dose (149 kg N ha-1) and spacing 20cm × 20cm was more potential in regarding yield contributing characters and yield of BRRI dhan28.