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ABSTRACT: A field experiment was undertaken to determine the contribution of yield components to yield of Aman rice grown under different levels of mixed fertilizers. Three high yielding Aman rice varieties (BR11, BRRI dhan31 and BRRI dhan32) and six fertilizer levels constituted the treatment variables. Six fertilizer levels were no fertilizer, mixed fertilizer at the rate of 100, 200, 300 and 400 kg ha-1 and individual fertilizer at the rate of 250 kg ha-1. Results showed that applied fertilizers had profound effect on yield components of all the three rice varieties of Aman rice. Among the yield components, response was maximum in tiller production where the highest number of tillers (299 m-2) was recorded in the variety BRRI dhan31 with individual fertilizer which was identical to the tillers (295 m-2) of the variety BRRI dhan32 produced with the mixed fertilizer at the rate of 300 kg ha-1. Correlation study indicated that contribution of tiller number is the highest to the yield of Aman rice varieties as indicated by 1.0 correlation coefficient. Regression analysis revealed that maximum yield of 5.10, 5.35 and 5.70 t ha-1 of BR11, BRRI dhan31 and BRRI dhan32 may be obtained by mixed fertilizer optimized at 250, 370 and 360 kg ha-1, respectively.
Keywords: Aman rice, genotypic variation, mixed fertilizer
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