FOLIAR APPLICATION OF BORON AT DIFFERENT GROWTH STAGES FOR INCREASING BORO RICE PRODUCTION

Abstract

The field experiment was conducted at Sher-e-Bangla Agricultural University, Sher-eBangla Nagar, Dhaka-1207 during the period from November, 2018 to May, 2019 to

find out the influence

of splitting of Boron as foliar application at different stages of boro rice. Two factors were used in the experiment, where two rice varieties viz. V : BRRI dhan28 and V : BRRI hybrid dhan5 and five levels of boron (B) application - B 0 2 : 100% recommended B as basal dose, B : 75% of B as basal dose + 25% of B as foliar application at vegetative stage, B ii 2 :

1 75% of B as basal dose + 12.5% of B as foliar application at vegetative stage + 12.5% of B at panicle initiation, B : 50% of B as basal dose + 50% of B as foliar application at vegetative stage and B : 50% of B as basal dose + 25% of B as foliar application at vegetative stage + 25% of B as foliar application at panicle initiation stage. The experiment was laid out in a Split-plot design with three replications. Variety V showed maximum plant height (100.73 cm), number of tillers hill -1 2 (12.55), leaf area index (7.21), dry weight of plant hill (62.38 g), number of effective tillers hill -1 (11.59), panicle length (27.62 cm), number of filled grains panicle -1 (171.73), number of total grains panicle -1 (190.27), grain yield (6.66 t ha -1 ), straw yield (7.36 t ha -1 ), biological yield (14.03 t ha -1 ) and harvest index (47.48%). In case of boron, B 4 influenced on number of tillers hill -1 (14.54), leaf area index (7.43), dry weight of plant hill -1 4 3 (70.68 g), number of effective tillers hill

(13.69), panicle length (27.68 cm), number of filled grains panicle -1 (176.17), number of total grains panicle -1 (189.00), grain yield (6.62 t ha -1 -1 ), straw yield (7.55 t ha ), biological yield (14.17 t ha -1 ) and harvest index (46.55%). Interaction effect of variety and different levels boron splitting also showed significant influenced on different parameters. Results revealed that the number of effective tillers hill (14.27), maximum leaf area index (8.05), highest dry weight of plant hill -1 (71.78 g), panicle length (29.60 cm), number of total grains panicle -1 (205.00), number of filled grains panicle -1 (193.00), 1000-grain weight (38.23 g), grain yield (7.64 t ha ), straw yield (8.27 t ha -1 ), biological yield (15.91 t ha -1 ) and harvest index (48.02%) were recorded from the treatment combination of V 2 B . So, application of boron splitting at different stages of boro rice might be an option to improve its yield and yield attributes.