VARIETAL PERFORMANCE OF BORO RICE UNDER INTEGRATED NUTRIENT MANAGEMENT

Abstract

The experiment was conducted at the farm of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, Bangladesh during the boro season from December 2015 to May 2016 to evaluate the yield performance of BRRI dhan63 and hybrid variety Heera 4 under Integrated Nutrient Management system and to identify the combined optimum level of vermicompost and nitrogenous fertilizer regarding better yield parameters of rice..The variety BRRI dhan63 and Heera 4 was used as the test crop.The experiment comprised of two factors as, Factor A: variety (2) BRRI dhan63 and Heera 4 and Factor B: combination of organic and inorganic fertilizer including five treatments viz. T 1 = control, T 2 = 140 kg N ha -1 from urea, T 3 =100 kg N ha -1 from urea + 40 kg N ha -1 supplemented by vermicompost, T 4 = 80 kg N ha -1 from Urea + 60 kg N ha -1 supplemented by vermicompost, T 5 =Full organic (140 kg N ha

supplemented by vermicompost). Variety Heera 4 performed better than BRRI dhan63 regarding the plant height, panicle length,grain yield, straw yield and harvest index. In case of plant height, Heera4 was taller (87.47 cm) than BRRI dhan63 (83.53 cm). The longest paniclewas obtained fromHeera 4 (25.13cm) and lowest in BRRI dhan63 (23.53cm). Rest of the characters i.e no. of effective tillers plant -1 , no. of grains panicle -1 , and 1000 grain wt (g), showed insignificant result. From the studymore thousand-grain wt (26.87), highest yield of grain and straw (6.08 and 6.88 t ha -1 respectively) were obtained from the variety Heera 4 incomparison to BRRI dhan63 where BRRI dhan63 gave more effective tillers hill -1 (17.73) and highest number of grains panicle (96.20). From the study treatment T 3 (100 kg N ha -1 from urea + 40 kg N ha

supplemented by vermicompost) showed the best performance at all the characters. The tallest plant (87.83 cm), longest panicle (24.83cm), more grains panicle -1 (104.20), highest weight of 1000 grain wt (26.50 g), highest yield of grain and straw (6.28 and 7.13 t ha -1 respectively) and highest HI (46.98%) were recorded in T 3 where above all characters were lowest in T (control). The combinations (Heera 4 x 100 kg N ha -1 from urea x 40 kg N ha 1 -1 supplemented by vermicompost) showed superior result among the whole characters of the study. So, it could be concluded that the cultivar Heera 4 applied with urea and vermicompost would be the suitable variety and optimum organic (vermicompost) + inorganic (urea) N combination, for getting the higher production. The above results also suggested that the application of organic fertilizer as vermicompost can reduce by 30% use of inorganic fertilizer and also reduce the soil pollution by chemical fertilizer and improve soil physical properties. -1 -1 -1