Effect of Plant Growth Regulator on Growth, Yield and Yield Components of Onion
A field experiment was conducted in the research field of Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh, during the period from December 2003 to March 2004 to study the effect of GABA on growth and yield attributes of onion (cv. BARI peaj-1). The experimental field was medium fertile and silt loam in texture. Effect of GABA (a mixture of GA3 and STC4771) sprayed at 30 DAT with 0.0, 0.5, 1.0 and 2.0 mg L-1 was investigated. The treatments were laid out in one factorial RCBD design where each treatment was replicated five times. All morphological characters, growth and yield attributes were significantly affected by the application of GABA, which at 1.0 mg L-1 produced the highest plant height, leaf length, number of leaves, neck and bulb diameter, bulb length, leaf diameter, root length; fresh weight of bulbs, roots and leaves; splitting of bulbs, leaf and bulb yield of onion. GABA at 1.0 mg L-1 was more effective in enhancing growth and yield attributes than 0.5 and 2.0 mg L-1. Application of GABA at 0.5, 1.0 and 2.0 mg L-1 increased the bulb yield by 20.18, 28.09 and 7.02%, respectively. The results suggested that GABA at 1.0 mg L-1 is suitable for onion or any vegetable crop production but GABA at 2.0 mg L-1 may be harmful for plant growth.
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