|Authors: ||M.A. Hasan, M. Manna, B.C. Das, B. Singh, K.K. Mandal, S. Mandal, S.K. Ray, S. Jha, S. Kole|
|Keywords: ||mango, paclobutrazol, irregular bearing, flowering, yield, quality|
The investigation was carried out at the Central Research Farm of Regional Research Station, Bidhan Chandra Krishi Viswavidyalaya, Gayeshpur, Nadia, West Bengal, India during the years 2006-07 and 2007-08 to evaluate the response of paclobutrazol in mitigating irregular bearing and improving yield and quality of mango ‘Himsagar’. The observations were recorded on inflorescence behaviour, yield and yield attributing characters and quality.
The treatments consisted of six different doses of paclobutrazol (1 to 6 ml/m of canopy spread) applied at monthly interval during August to November (150, 120, 90 and 60 days before flower emergence). Two-way ANOVA technique without interaction was followed to com¬pare the means of main effect due to dose(s) and month of application.
Multivariate data reduction technique Principal Component Analysis (PCA) was used to adjudge the treatment combination i.e., dose of paclobutrazol vs. month of application fol¬lowing the correlation matrix as dispersion matrix.
Paclobutrazol at the higher doses (5 and 6 ml/m of canopy spread) applied in the month of August/September (150/120 days before flower emergence) was found most effective in improving flowering, yield and quality.
In contrast, the lower doses of paclobutrazol (3 and 4 ml/m of canopy spread) were also found equally effective with October application.
From the results it appears that cost effective but equipotent solution in mitigating irregular bearing could be achieved by applying paclobutrazol at 4 ml/m of canopy spread during second fortnight of September (120 days before flower emergence) to first fortnight of October (90 days before flower emergence).
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