Effect of nitrogen and spacing on the yield and yield contributing characters of boro rice (CV. BRRI dhan28)

An experiment was conducted at the Agronomy Field laboratory, Bangladesh Agricultural University, Mymensingh to study the effect of nitrogen and spacing on the yield and yield contributing characters of Boro rice cv. BRRI Dhan28. The experiment consisted of four nitrogen levels, viz. 0, 80, 100 and 120 kg ha^-1 and three spacing viz. 20 cm× 15 cm, 25 cm× 15 cm and 30 cm× 15 cm. The experiment was laid out in a randomized complete block design with three replications. Nitrogen level significantly influenced the plant height, number of effective tillers hill^-1, number of total tillers hill^-1, panicle length, grain yield and straw yield except 1000-grain weight. The highest grain yield (5.21 t ha^-1) was recorded from 100 kg N ha^-1¸ and the lowest (4.26 t ha^-1) from 0 kg N ha^-1or control treatment. Spacing significantly influenced all the yield and yield contributing characters except also 1000-grain weight. The highest grain yield (5.21 t ha^-1) was recorded from the spacing 25 cm× 15 cm whereas the lowest grain yield (4.21 t ha^-1) was obtained from the spacing 20 cm× 15 cm. The highest grain yield (5.71 t ha^-1) and the harvest index (45.98%) were obtained from the interaction of 100 kg N ha^-1 with 25 cm× 15 cm spacing. The highest straw yield (7.08 t ha^-1) was obtained from the interaction of 120 kg N ha^-1 with 30 cm× 15 cm spacing. The lowest (3.59 t ha^-1) grain yield was obtained from the control treatment with 20 cm× 15 cm spacing

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