EFFECTS OF TIME AND ROOTING MEDIA ON SURVIVABILITY OF AIR LAYERING IN GUAVA. Das AC, Rahman MM, Rob MM, Mahmud MMC and Sabur SA

ABSTRACT

The experiment was carried out to study the effect of time of operation and rooting media on survivability of air layering Mymensingh during March to August, 2011. The experiment comprised of five operation times (March, April, May, June and July 2011) and 11 rooting media (50% cow dung + 50% loamy soil), (50% cow dung + 50% saw dust), (50% compost + 50% loamy soil), (50% cow dung + 50% coconut coir), 100% cow dung, 100% loamy soil, 100% compost, 100% moss, (25% cow dung + 75% loamy soil), (25% loamy soil + 75% cow dung) and 100% saw dust. The highest survivability (96.97%), number of new shoots/layer (8.81) and the number of leaves/layer (15.12) was recorded in June and the lowest survivability (55.15%), number of new shoots/layer (3.45) and the number of leaves/layer (4.55) in July. The highest survivability (80%) was recorded in moss whereas the number of new shoots/layer (6.75) as well as the number of leaves/layer (15.12) was in compost and the lowest survivability (52%), the number of new shoots/layer (3.84) and the number of leaves/layer (4.55) were obtained in July from saw dust. The combined effect of time of operation and rooting media on survivability was found to be significant. The maximum survivability (100%) of detached air layers was observed in the treatment combinations of May x compost, May x moss, June x compost, June x moss and June x (25% cow dung + 75% loamy soil). The highest number of new shoots (9.53) and leaves per layer (18.13) was obtained from the treatment combinations of May x compost and June x compost at 150 DAP. On the other hand, the treatment combinations of March x saw dust, April x saw dust and July x saw dust showed the lowest percentage of survivability (40%) and the combination of July x saw dust showed the lowest number of new shoots (2.27) and leaves (3.00) as well.

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