The experiment was carried out for controlling mango malformation and achieving higher yield and quality of mango cv. Amrapali at the Germplasm Centre of the Fruit Tree Improvement Project (GPC-FTIP), Department of Horticulture, Bangladesh Agricultural University, Mymensingh during the period from July 2000 to July 2001. The treatments were different concentration of NAA viz. 100, 200 and 300 ppm and spray times viz. 1 week of October and 1 week of November. The highest sex ratio (1:5.33) was found in 1 November and the lowest (1:6.02) was found in 1 October spray. It was found that the highest (8.49 t/ha) yield was recorded from 1 October application of NAA and the lowest (7.22 t/ha) was observed in 1 November. NAA at 200 ppm gave the highest (10.17 t/ha) yield while control treatment gave the lowest (4.65 t/ha) yield. 1 October × 200 ppm NAA produced the highest (11.39 t/ha) yield than 1 November × control (4.48 t/ha).
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