Green Global
Foundation   Journal
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EFFECT OF N LEVEL ON GROWTH AND YIELD OF T. AMAN RICE CV. SURJOMONI (Pages : 33 - 37)

An experiment was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, during July to December 2007 to observe the effect of nitrogen level on the yield performance of transplant aman rice cv. Surjomoni. Four spacing, 25×10, 25×15, 25×20 and 30×20 cm were compared at five nitrogen levels, 0, 45, 90, 135 and 180 kg N ha-1 in randomized complete block design. Nitrogen level significantly influenced yield contributing characters and yield except 1000-grain weight. The highest number of panicle hill-1 (6.53), panicle length (28.65 cm), grains panicle-1 (128.25), grain yield (5.77 t ha-1), straw yield (8.80 t ha-1) and harvest index (39.60%) were obtained with 90 kg N ha-1. The maximum plant height (124.66 cm), tillers hill-1 (8.88) and sterile spikelets panicle-1 (39.83) were obtained with 180 kg N ha-1. Rice yield responded quadratically to N application. The calculated maximum N dose was 78 kg ha-1 and optimum 73 kg ha-1. The response of rice to applied N (agronomic efficiency) varied from 24.67 kg grain/kg N at 45 kg N ha-1 to 4.5 kg kg-1 at the highest N rate (180 kg N ha-1).Download