FERTILIZER MANAGEMENT OF HYV RICE IN THE POLDER ECOSYSTEM OF THE COASTAL ZONE OF BANGLADESH

Abstract

A field experiment was conducted of the farmer field in polder 30 at Basurabad village, Batiaghata, Khulna during July to December 2016 in order to develop fertilizer management techniques for HYV rice under tidal ecosystem prevailing in the polders of the coastal zone of Bangladesh. The experiment was comprised three rice varieties viz. BRRI dhan51, BRRI dhan72, and kumragor local T. aman rice and six fertilizer doses viz. No N + No P K S Zn(N ), 50% recommended N + No P K S Zn (N 2 ) , 100% recommended N + No P K S Zn(N 1 3 ) 50% recommended N + 50% recommended P K S Zn(N 4 ) , , 100% recommended N + 50% recommended P K S Zn (N 5 ) , 100% recommended N + 100% recommended P K S Zn(N ) and The experiment was laid out in a split-plot design with four replication. The purpose of the experiment was to developed fertilizer management techniques for HYV rice under tidal ecosystem prevailing in the polder of the coastal zone and to find out optimum fertilizer dose of HYV Aman rice for polder ecosystem. Data on different yield contributing characters, growth, and yield were recorded. Interaction between varieties and fertilizer management showed a positive impact on growth, yield and yield attributes of aman rice. Varieties showed the significant variations on plant height, tillers hill -1 , panicle length, grains panicle -1 6 , thousand grains weight, grain yield, straw yield, biological yield and harvest index. BRRI dahn51 gave the highest grain yield (5.39 tha -1 ). Fertilizer management also significantly influenced the growth and yield attributes of aman rice. The highest grain yield (4.98 t/ha) was observed in N . Interaction between variety and fertilizer management doses significantly influences plant height, tillers hill 6 -1 , panicle length, grains panicle , thousand grains weight, grain yield, straw yield, biological yield and harvest index. The highest grain yield (6.30 t ha -1 ) was recorded from the V treatment combination which was statistically similar with V 1 N . The highest filled grain panicle -1 (137.75) was observed in V treatment, biological yield (12.35 tha 1 N 5 -1 5 . Straw yield (8.98 tha ) was observed in V 3 -1 1 N 6 ) was higher in V N and harvest index (56.13 %) was higher in V 1 N 1 treatment. It may be concluded that V 1

treatment showed best result in the tidal ecosystem of the polder coastal zone