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Abstract

A pot experiment was carried out at the experimental site of Crop Physiology Division of Bangladesh Institute of Nuclear Agriculture, Mymensingh during August to November 2003 to study the effects of IAA (Ind°le acetic acid) on yield and yield attributes of aman rice var. Binashail grown under irrigated and moisture stress conditions. The experiment comprised of four levels of IAA viz. 0, 25, 50 and 75 Ppm and two levels of irrigation viz, continuous irrigation and moisture stress for 7 days at booting stage. Results revealed that most of the yield contributing characters had better performance under irrigated condition compared to the water stress. The application of 50 ppm IAA produced the maximum grain yield/hill as a consequence of higher number of tillers/hill, longer panicle length and higher number of filled grains/panicle. The interaction effects of irrigation and IAA showed that application of 50 ppm IAA in continuously irrigated plants had resulted in the highest grain yield. The application of the same dose also produced the highest grain yield/hill even in seven days stress at the booting stage.

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