INFLUENCE OF NITROGEN AND PHOSPHORUS ON GROWTH AND YIELD OF HYBRID RICE

Abstract

The Experiment was carried out at Sher-e-Bangla Agricultural University, Dhaka during the period of November, 2010 to May 2011 to study the influence of levels of nitrogen and phosphorus on the growth and yield of hybrid Heera1. The experiment was laid out on split plot design with three replications having nitrogen fertilizer in the main plot and phosphorus fertilizer in the sub plot. There were six nitrogen fertilizer levels viz., N =no nitrogen, N 1 =80 kg N ha -1 , N 2 =urea supergranules (2.7 g) @ 75 kg N ha -1 0 ), N =120 kg N ha -1 , N 4 =160 kg N ha -1 , N 5 =200 kg N ha -1 and four phosphorus fertilizer levels viz., P 0 =no phosphorus, P 1 =30 kg P 2 O 5 ha -1 , P 2 =50 kg P 2 O 5 ha =70 kg P 2 O 5 ha -1 . Urea was top dressed in three equal splits at 10, 35 and 55 DAT. The USG (2.7 g) was placed at 5-10 cm soil depth at 10 DAT in the centre of four hills in alternate rows @ 1 granule in one spot to supply 75 kg N ha . Results indicated that the effect of nitrogen showed significant variation in respect of all growth, yield contributing characters and yield. At harvest, highest plant height (96.74 cm), tillers hill -1 (14.22), LAI (7.72), total dry matter (66.26 g), effective tillers hill -1 -1 3 and P (13.63), panicle length (24.29 cm), filled grains panicle

(154.67), total grains panicle -1 (159.20), 1000 grain weight (29.35 g), grain yield ( 9.42 t ha -1 ), straw yield (13.33 t ha -1 ), biological yield (22.75 t ha ) was obtained from the application of USG. About 10% more grain yield was measured from USG than PU. Phosphorus @ 50 kg P 2 O gave the highest grain yield (7.85 t ha -1 5 ). Interaction effect showed that application of USG along with

-1 3

-1 -1 50 kg P 2 O 5 ha -1 gave the highest (9.83 t ha -1 ) grain yield. On the other hand application of 160 kg N ha -1 and 120 kg N ha -1 along with 50 kg P gave similar grain yield as 8.83 t ha

-1 and 7.67 t ha -1 , respectively. 2 O 5

ha -1