SUCCESSIVE CULTIVATION OF INBRED AND HYBRID RICE USING CLONAL TILLERS IN BORO SEASON

Abstract

A field experiment was conducted at the Agronomy field, Sher-e-Bangla Agricultural University, Dhaka from November 2012 to July 2013. Experiment consisted of two factors: Factor A: Variety viz. BRRI dhan29 (V 1 ) and BRRI hybrid dhan2 (V ) and Factor B: Planting material viz. Nursery seedlings (N), First generation clonal tillers (C 1 ) collected from N, Second generation clonal tillers (C 2 ) collected from C , Third generation clonal tillers (C 3 ) collected from C and Fourth generation clonal tillers (C 4 ) collected from C 3 2 , following split-plot design with three replications. Hybrid variety BRRI hybrid dhan2 was the early variety (89 days and 123 days, respectively for flowering and maturity) whereas inbred variety BRRI dhan29 (100 days and 130 days, respectively for flowering and maturity) was the late one. The maximum number of total grains, filled grains and unfilled grains panicle -1 (212.82, 161.29 and 51.53, respectively) were obtained from BRRI dhan29 while the minimum from BRRI hybrid dhan2 (147.83, 139.31 and 8.52, respectively) but yield was not varied significantly. The maximum weight of 1000-grain (26.50 g) was obtained from hybrid variety and the minimum from the inbred one (19.70 g). The nursery seedlings gave highest grain yield (9.23 t ha -1 ) that followed by first generation clonal tillers (7.44 t

1 2 A field experiment was conducted at the Agronomy field, Sher-e-Bangla Agricultural University, Dhaka from November 2012 to July 2013. Experiment consisted of two factors: Factor A: Variety viz. BRRI dhan29 (V 1 ) and BRRI hybrid dhan2 (V ) and Factor B: Planting material viz. Nursery seedlings (N), First generation clonal tillers (C 1 ) collected from N, Second generation clonal tillers (C 2 ) collected from C , Third generation clonal tillers (C 3 ) collected from C and Fourth generation clonal tillers (C 4 ) collected from C 3 2 , following split-plot design with three replications. Hybrid variety BRRI hybrid dhan2 was the early variety (89 days and 123 days, respectively for flowering and maturity) whereas inbred variety BRRI dhan29 (100 days and 130 days, respectively for flowering and maturity) was the late one. The maximum number of total grains, filled grains and unfilled grains panicle -1 (212.82, 161.29 and 51.53, respectively) were obtained from BRRI dhan29 while the minimum from BRRI hybrid dhan2 (147.83, 139.31 and 8.52, respectively) but yield was not varied significantly. The maximum weight of 1000-grain (26.50 g) was obtained from hybrid variety and the minimum from the inbred one (19.70 g). The nursery seedlings gave highest grain yield (9.23 t ha -1 ) that followed by first generation clonal tillers (7.44 t

1 2ha -1 ) and second generation clonal tillers (6.57 t ha -1 ). The next two successive generation of clonal tillers also produced around 3 t ha -1 grain yield. The maximum grain yield (9.6 t ha -1 ) was observed in nursery seedlings of BRRI hybrid dhan2 that similar to the same planting material of BRRI dhan29 (8.86 t ha -1 ). The first and second generation clonal tillers of both the varieties produced more than 6 t ha grain yield. -1