Growth performance of aromatic Boro rice (Oryza sativa L. cv. BRRI dhan50) as influenced by date of transplanting and nutrient management

Abstract

The present experiment  was  conducted  at  the  Agronomy  Field  Laboratory,  Bangladesh Agricultural  University,  Mymensingh,  during  December  2015  to May  2016 to find out the effect of transplanting date and nutrient management on the growth performance of aromatic Boro rice (cv. BRRI dhan50). The experiment comprised five dates of transplanting viz. 15 December, 30 December, 15  January; 30  January and 15  February, and four nutrient managements viz., recommended dose of inorganic fertilizer (N, P, K, S and Zn @ 115, 25, 60, 18, 3.5  kg ha^-1,  respectively),  poultry manure @ 5 t ha^-1, 25% less than recommended dose of inorganic fertilizer + poultry manure @ 2.5 t ha^-1, 50% less than recommended dose of inorganic fertilizer + poultry manure @ 2.5 t ha^-1. The experiment was laid out in a randomized complete block design with three replications. Morpho-physiological characteristics were significantly influenced by date of transplanting, nutrient management and their interactions. The highest plant height (71.41 cm) was recorded in early transplanting (15 December) and the lowest plant height (66.29 cm) was recorded when transplanted on 15 February. At 75 DAT, the tallest plant (72.79 cm), the highest number of tillers hill^–1 (15.13) and LAI (2.78) were obtained in 25% less than recommended dose of inorganic fertilizers + poultry manure @ 2.5 t ha^-1 and the shortest plant (66.63 cm) and lowest  number of tillers hill^–1 (11.13) were recorded when applied only poultry manure @ 5 t ha^-1. The highest dry matter production hill^–1 (31.18 g) at 75 DAT was obtained when the crop was transplanted on 15 December and fertilized with 25% less than recommended dose of inorganic fertilizers + poultry manure @ 2.5 t ha^-1.  Therefore, aromatic Boro rice (cv. BRRI dhan50) can be transplanted on 15 December fertilized with 25% less than recommended dose of inorganic fertilizers + poultry manure @ 2.5 t ha^-1 for appreciable growth performance.