Impact of seasonal changes on air layering and rooting hormone in Spondias pinnata (J. Koenig ex L. f.) Kurz.
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Abstract: Air layering trials were conducted in Spondias pinnata during four different seasons, winter (January), rainy (July), spring (March) and autumn (October). Juvenile branches with 1.00 to 2.00 cm diameter were girdled using Indole Acetic Acid (IAA) and Indole Butyric Acid (IBA) with the rooting hormones (100, 300 and 500 ppm) along with control. The impact of seasons and rooting hormone were investigated. Callus was formed at the girdled portions of all the air layers with or without hormones. Result revealed that July (Rainy season) proved to be better season for making air layers than other months viz. October (autumn), January (winter), and March (spring) in Spondias pinnata and IBA 500 ppm was more effective in promoting root formation.