GROWTH AND YIELD PATTERN OF BLACKGRAM AS AFFECTED BY DIFFERENT NITROGEN APPLICATION METHODS

Abstract

The experiment was conducted at the farm of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, Bangladesh during the period from September to December 2012 to study the response of blackgram with maximum utilization of nitrogen given in different method. The variety BARI mass-3 was used as the test crop. The experiment consisted of the following treatments as T0 = Prilled urea (PU) broadcast, T1 = PU given in furrows, T2 = PU given between two rows, T3 = PU and seeds given in same furrows, T4 = USG placed at 10 cm distance (avoid one row), T5 = USG placed at 10 cm distance (avoid two rows), T6 = USG placed at 10 cm distance (avoid three rows), T7 = USG placed at 20 cm distance (avoid one row), T9 = USG placed at 20 cm distance (avoid two rows), T9 = USG placed at 20 cm distance (avoid three rows), T10 = USG placed at 30 cm distance (avoid one row), T11 = USG placed at 30 cm distance (avoid two rows), T12 = USG placed at 30 cm distance (avoid three rows), T13 = USG placed at 40 cm distance (avoid one row), T14 = USG placed at 40 cm distance (avoid two rows) and T15 = USG placed at 40 cm distance (avoid three rows). USG (1.8 g) placed at 10 cm depth in each case. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. Results revealed that data on different growth, yield and yield contributing characters of blackgram were recorded and significant variations were observed among the studied characters. Treatment T1 (PU given in furrows) registered the maximum plant height (22.22 cm, 53.91 cm, 53.91cm, 74.86 cm an 76.53 cm), leaves plant-1 (4.03, 10.20, 17.93, 20.50 and 22.57), branches plant-1 (1.53, 4.26, 4.57, 5.11 and 6.00) and highest total dry weight (0.43 g, 4.57 g, 15.01 g, 28.31 g and 21.19 g) at 15, 35, 55, 75 DAS and harvest, respectively. The minimum plant height (18.47 cm, 43.47 cm, 43.47 cm, 57.50 cm and 53.79 cm), leaves plant-1 (3.10, 6.73, 11.73, 13.03 and 14.90), branches plant-1 (1.13, 2.39, 2.88, 2.92 and 3.33) and the lowest total dry weight (0.26 g, 3.05 g, 11.83 g, 23.04 g and 16.13 g, respectively) were observed with T15 (USG placed at 10 cm depth at 40 cm distance avoiding three rows) at all growth stages. The maximum yield contributing characters like pods plant-1 (20.10), pod length (4.57 cm), seeds pod-1 (6.80) and 1000-seeds weight (60.93 g) were found when crop was given prilled urea in furrow (T1). Plant showed minimum pods plant-1 (15.23), pod length (3.87 cm), seeds pod-1 (6.21) and 1000-seed weight (55.95 g) when treated with lower amount of USG (T15). The highest seed yield, stover yield and biological yield were noted as 1.32 t ha-1, 2.23 t ha-1 and 3.55 t ha-1 from T1, respectively, when T15 showed the minimum seed yield (1.00 t ha-1), stover yield (1.52 t ha-1) and biological yield (2.39 t ha-1). It was evident that the results with prilled ureawere more or less similar with urea super granule.