EFFECT OF LEAF CUTTING ON GROWTH AND YIELD OF MORDERN AMAN RICE VARIETIES

Abstract

An experiment was carried out in the Experimental Field of the Agricultural Botany Department, Sher-e-Bangla Agricultural University, Dhaka during 2016 -2017, to assess the effect of leaf cutting on plant growth and yield of selected BRRI released Aman varieties. The experiment consisted of five rice varieties namely BRRI dhan32, BRRI dhan33, BRRI dhan39, BRRI dhan62, BRRI dhan56 and two treatments viz .i.) variety, ii) leaf cutting. RCBD with four replications was used in this experiment. Irrespective of all studied varieties, the highest leaf length, leaf width, leaf area, plant height, leaf numbers at heading, numbers of tillers hill -1 , grains panicle, grain yield, straw yield, 1000 grain weight, chlorophyll content and harvest index were obtained in no leaf cutting (control). The yield and yield contributing characters is decreased by leaf cutting as compared to the control. Among the varieties, BRRI dhan33 gave the significantly higher yield in control (control 6.75t ha -1 ,treated 4.75t ha ) The highest grain yield was obtained in no leaf cutting(6.75 t ha ). Cutting of leaf led to a decline in the number. of panicles hill -1 -1 which eventually reduced the grain yield. The leaf cutting (except flag leaf and penultimate leaves) reduced about 10 to 28% loss of grain yield. Besides this, 1000 grains weight was significant reduced in leaves cut plant observed compared to that of the control plant. Remarkable variation in grain filling duration was also noticed in the different varieties due to leaf cutting. Reduction of grain yield was minimum (10%) in BRRI dhan39 (control 5.75t ha -1 ,treated 5.15t ha -1 ) with leaf cutting than that of the rest varieties.