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Journal of Agronomy
Year: 2002  |  Volume: 1  |  Issue: 3  |  Page No.: 123 - 126

Growth Analysis of Soybean as Influenced by GA3 and IAA and their Frequency of Application

Pulak Kumar Sarkar, Md. Shahidul Haque and M. Abdul Karim    

Abstract: The experiment was carried to investigate the effect of plant growth regulators on the growth of soybean. Soybean (cv. BS-3) plants were sprayed with 0, 100 or 200 ppm of GA3 and IAA at three different times (20 and/or 42 days after sowing). The results indicate that physiological characters e.g. leaf area index (LAI), crop growth rate (CGR), relative growth rate (RGR) and net assimilation rate (NAR) were influenced by the application of the growth regulators. GA3 and IAA at 100 ppm significantly increased LAI, CGR, RGR and NAR. IAA at 200 ppm increased NAR. Double spraying at 20 and 42 DAS performed better than single spraying at 20 DAS and spraying at 42 DAS. Double spraying with GA3 and IAA had the highest CGR, NAR, LAI. On the other hand, single spraying with GA3 produced highest RGR and 200 ppm of IAA produced highest NAR. Spraying at 42 DAS of GA3 and IAA produced highest leaf area index and CGR over the single and double spraying. LAI, RGR, CGR and NAR progressed in similar patterns, regardless of the treatments. The treated plants attained high LAI, RGR, CGR and NAR than the control. This study clearly shows that 100 ppm of GA3 and IAA treated plants performed better than control and other treated plants.

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