INFLUENCE OF ZINC ON YIELD AND QUALITY OF AROMATIC RICE

Abstract

The experiment was conducted at the experimental field of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka during the period of June to December 2017 to find out the influence of zinc on yield and quality of aromatic rice. Aromatic rice cultivars Dulhabhog, Chinigura, Khoisanne and Chiniatab were used in this experiment. The experiment consisted of two factors viz., Factor A: Four levels of zinc (Zn) such as-Zn 1 : 2.5 kg Zn ha : 3.0 kg Zn ha -1 , Zn 3 : 3.5 kg Zn ha -1 , Zn 4 : 4.0 kg Zn ha -1 ; and Factor B: Four cultivars of aromatic rice such as- V 1 : Dulhabhog, V 2 : Chinigura, V 3 -1 , Zn 2 : Khoisanne and V 4 : Chiniatab. The two factors experiment was laid out in a split-plot design with three replications. Zn level were assigned to main plot and variety to sub plot. Data were recorded on yield attributes, yield and quality of aromatic rice. The result revealed that zinc level had no significant effect on grain yield. Results revealed that supplementation of zinc and/or different varieties had significant effect on most of the yield and quality contributing parameters. Effective tillers, filled grains, weight of milled rice, protein content, proline content and grain 2Acetyl-1-pyrroline

(2-AP) content increased with increasing zinc level. But Zn level had no significant effect on 1000 grains weight, grain yield, harvest index and amylose content among the four aromatic rice varieties. The highest grain yield was observed from V 1 , highest proline content was found from V 2 and maximum grain 2-AP content was found from V 3 . Among the 16 treatment combinations, the highest plant height (54.77, 87.76, 120.78, 127.49 and 130.79 cm, respectively) was observed from Zn 4 V 1 at different date, respectively. The highest grain yield (2.94 ha -1 ) was found from Zn 4 V 1 . The highest proline content (26.74 mg g -1 ) was recorded from Zn 4 V 2 on dry weight (DW) basis. The highest grain-2AP content (1.41 µg g -1 ) was recorded from Zn 4 V 3 on dry weight (DW) basis. So it may be concluded that applications 4.0 kg Zn ha aromatic rice variety Dulhabhog showed the superior characters among the other treatments in consideration of yield and quality. On the other hand, application of 4 kg Zn ha -1 and aromatic rice variety Khoisanne showed the best performance in case of protein, amylose and 2-AP content but not on proline. -1 on