EFFECT OF LEAF CUTTING ON MORPHO-PHYSIOLOGY AND YIELD OF SELECTED RICE VARIETIES

Abstract

The present investigation entitled “Effect of leaf cutting on morpho-physiology and yield of selected rice varieties” was conducted from February to June, 2019 at the Research Farm of SAU, Dhaka, Bangladesh. The experiment comprised of two factors; viz. Factors A: Two rice varieties(BRRI dhan29 and BRRI hybrid dhan2) and Factor B: Leaf cutting (Flag leaf cutting, Flag leaf + 3 rd leaf cutting, Penultimate leaf + 3 rd leaf cutting, all leaves cutting without flag leaf, all leaves cutting and Untreated control). The experiment was laid out in spilt plot with three replications. Different treatment combinations showed significant differences due to their interaction effect on morphological parameters, physiological parameters, yield attributes and yield. Considering all leaf cutting treatments the tallest plant (98.22 cm), maximum number of tillers hill -1 (20.56g), leaves hill -1 (22.78g), total dry mater (13.64 g), leaf area index (2.34 cm ), stomatal conductance (0.49 mmol CO 2 m -2 s -1 ), SPAD (45.62), total spikelet panicle (174.9), weight of 1000 grain (27.19 g), grain yield (5.81 t ha -1 ), straw yield (6.48 t ha ) and harvest index (46.83%) were found in BRRI dhan29 variety. Whereas, maximum sterile spikelet panicle 1 (35.50) and spikelet sterility (21.15%) were found in BRRI hybrid dhan2 variety. Considering both varieties the tallest plant (99.50 cm), maximum total number of tillers hill (25.00), number of leaves hill -1 (26.17g), total dry mater (20.42 g), leaf area index (2.95 cm ), stomatal conductance (0.55 mmol CO 2 m -2 s -1 ), SPAD (46.17), grain panicle -1 (147.50), total spikelet panicle -1 (175.5), effective tillers hill -1 (8.33g), spikelet panicle -1 (149.8g), weight of 1000 grains (28.97 g), grain yield (7.73 t ha -1 ), straw yield (9.35 t ha -1 ) and harvest index (48.60%) were found in L 0 (Untreated control). Whereas, maximum sterile spikelet panicle (47.50g) and spikelet sterility (45.72%) were found in L 5 (All leaves cutting).Consiering the combination of varieties and leaf cutting the tallest plant (104.3 cm), maximum number of tillers hill (26.67g), number of leaves hill -1 (27.67g), total dry mater (21.50 g), leaf area index (2.95 cm ), stomatal conductance (0.57 mmol CO 2 m -2 s -1 ), SPAD (46.67), number of grain padnicle (151.67g), total number of spikelet panicle -1 -1 -1 -1 -1 (241.7g), weight of 1000 grain (29.63 g), number of grain panicle

(8.13g) and straw yield (9.47 t ha -1 ) were found in BRRI dhan29 + Untreated control. Whereas, the maximum number of sterile spikelet panicle -1 (47.67) and spikelet sterility (42.45%) were found in BRRI dhan29 +Untreated control. From this study it can be concluded that, BRRI dhan29 performed well in case of leaf cutting treatments than BRRI hybrid dhan2. Beside this, Untreated control treatment performed great than the other treatments.

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