EFFECT OF DIFFERENT LEVELS OF NITROGEN AND TRANSPLANTING DEPTH ON GROWTH AND YIELD OF BRRI dhan50

Abstract

A field experiment was conducted at the experimental field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during November 2010 to April 2011 to study the effect of different levels of nitrogen and transplanting depth on the growth and yield of BRRI dhan50. The experiment consists of 4 different levels of N (0, 92, 115 and 136 kg ha-1) and 3 levels of transplanting depth (1.5, 3.0 and 4.5 cm). The experiment was laid out in split-plot design with three replications. Both nitrogen levels and transplanting depth had significant effects on most of the growth and yield contributing characters of BRRI dhan50. At 30, 50, 70 and 90 DAT (days after transplanting) and at harvest, the longest plant (27.07 cm, 43.85 cm, 61.22 cm, 78.37 cm and 95.35 cm) was observed from 136 kg N ha-1, while the shortest plant (21.92 cm, 35.51 cm, 52.22 cm, 66.02 cm and 82.71 cm) was recorded from the application of 0 kg N ha-1. The highest grain yield (6.17 t ha-1) was obtained from 115 kg N ha-1, while the lowest yield (3.53 t ha-1) was found from 0 kg N ha-1. At 30, 50, 70 and 90 DAT and at harvest, the longest plant (25.57 cm, 41.89 cm, 59.56 cm, 75.72 cm and 94.42 cm) was recorded from transplanting at 3.0 cm depth, while the shortest plant (24.44 cm, 39.73 cm, 55.92 cm, 72.34 cm and 88.49 cm) was observed from transplanting at 1.5 cm depth. The maximum number of effective tillers hill-1 (12.12) was observed from transplanting at 3.0 cm depth and the minimum number (11.09) was recorded from transplanting at 1.5 cm depth. The highest grain yield (5.63 t ha-1) was found from transplanting at 3.0 cm depth, whereas the lowest yield (5.16 t ha-1) was recorded at 1.5 cm depth. At 30, 50, 70 and 90 DAT and at harvest, the longest plant (28.17 cm, 45.45 cm, 63.76 cm, 82.33 cm and 98.89 cm) was found from the combination of 136 kg N ha-1 and transplanting at 3.0 cm depth, whereas the shortest(21.00 cm, 33.80 cm, 49.97 cm, 82.33 cm and 80.87 cm) was observed from the treatment combination of 0 kg N ha-1 and transplanting at 1.5 cm depth. The maximum number of effective tillers hill-1 (14.00) was recorded from the treatment combination of 136 kg N ha-1 and transplanting at 4.5 cm depth, again the minimum number (8.50) was found from 0 kg N ha-1 and transplanting at 1.5 cm depth. The highest grain yield (6.41 t ha-1) was recorded from the treatment combination of 115 kg N ha-1 and transplanting at 3.0 cm depth and the lowest yield (3.24 t ha-1) from 0 kg N ha-1 and transplanting at 1.5 cm depth. It may be concluded that growth, yield and yield contributing characters of BRRI dhan50 were greatly influenced by nitrogen level and transplanting depth. Applications of 115 kg N ha-1 at transplanting depth 3.0 cm provided the maximum yields of BRRI dhan50.