EXOGENOUS APPLICATION OF LANTHANUM ON THE YIELD AND QUALITY OF AROMATIC RICE

Abstract

The experiment was carried out at the Agronomy Research Field, Department of Agronomy, HSTU, Dinajpur during July to December 2023 to evaluate the effect of different levels of Lanthanum dose and different growth stages of aromatic rice cv. Kataribhog. The experiment consisted of two factors, namely factor A and factor B. Factor-A consisted of four doses of Lanthanum, such as L1 (control), L2 (100ppm), L3 (200ppm), and L4 (300ppm), and factor-B consisted of three application times of Lanthanum, such as T1 (at 25 DAT i.e., tillering stage), T2 (at 50 DAT i.e., panicle initiation stage), and T3 (at 75 DAT i.e., dough stage). The experiment was laid out in a randomized complete block design with 12 treatment combinations, each treatment replicated three times. The treatments were randomly distributed to the plots within a block. During the study period, various yield and yield contributing parameters were recorded, including plant height (cm), effective tiller hill-1 (no.), panicle length (cm), filled grain panicle-1, sterile grain panicle-1, 1000-grain weight (g), grain yield (t ha-1), straw yield (t ha-1), biological yield (t ha-1), and harvest index (%). The study result showed that L4 had the tallest plant (148.08 cm at harvest) in all cases while L3 produced the highest number of effective tiller hill-1 (19.94), the longest panicle (26.40 cm), the maximum total grain (184.99), the maximum filled grain panicle-1 (174.87), the highest 1000-grain weight (10.35 g), the highest grain yield (1.98 t ha-1), biological yield (6.37 t ha-1), and harvest index (30.99%). Moreover, the T2 treatment recorded the maximum plant height (146.43 cm at harvest), the highest number of effective tiller hill-1 (19.14) the longest panicle length (25.11 cm), the maximum filled grain panicle-1 (163.72), the highest 1000-grain weight (10.32 g), grain yield (1.91 t ha-1), biological yield (6.25 t ha-1), and harvest index (30.38%). As combined effect of treatments, L4T2 combination gave the best result for plant height (153.38cm at harvest) whereas the L3T2 had the highest number of effective tiller hill-1 (21.82), the longest panicle (27.14 cm), the maximum total grain (192.53), the most filled grain panicle-1 (184.53), the most grain yield (2.08 t ha-1), the most biological yield (6.25 t ha-1) and the highest harvest index (30.38%). The experiment's results indicate that all of the important growth parameters and yield contributing characters were improved due to application of Lanthanum @ 200 ppm when applied at panicle initiation stage resulting higher yield of Kataribhog rice.