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Effects of Time and Rooting Media on Success of Air Layering in Guava

M M Rahman
Department of Horticulture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

A C Das*
Department of Horticulture, Sylhet Agricultural University, Sylhet-3100, Bangladesh

M M Rob
Department of Horticulture, Sylhet Agricultural University, Sylhet-3100, Bangladesh

B Debnath
Department of Horticulture, Sylhet Agricultural University, Sylhet-3100, Bangladesh

M S Islam
Department of Horticulture, Sylhet Agricultural University, Sylhet-3100, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted to study the effect of time of operation and rooting media on the rooting success of air-layering in guava at the Germplasm Centre, Fruit Tree Improvement Project, Bangladesh Agricultural University, 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 result of the experiment indicates that the effect of time and rooting media on percent rooting success, root number and root length was significant. The highest percentage of rooting success (96.97%), number of roots/layer (7.76) and length of longest root (6.17 cm) was recorded in June and lowest percentage of rooting success (58.78%), number of roots/layer (1.25) and length of longest root (1.99 cm) in July. The highest percentage of rooting success (85.33%), number of roots/layer (6.04) and length of longest root (5.43 cm) was obtained from compost and lowest percentage of rooting success (65.33%), number of roots/layer (2.29) and length of longest root (1.96 cm) was obtained from saw dust. In case of combined effect of time and rooting media the maximum rooting success (100%) was observed in the combinations of May × compost, May × moss, June × compost and June × moss and lowest (46.670%) in the combinations of July × saw dust and April × saw dust. The highest number of roots/layer (9.930) and length of longest root (9.000 cm) was obtained from June × compost and lowest number of roots/layer (1.000) and length of longest root (0.970 cm) was obtained from July × saw dust combination.

Keywords: Time of operation, Rooting media, Rooting success, Air layering, Guava

Location: Germplasm Centre, Fruit Tree Improvement Project, Bangladesh Agricultural University, Mymensingh

Start Date: 00-03-2011

End Date: 00-08-2011

Program Area: Crop-Soil-Water Management

Commodity: Guava

Objectives:

The present piece of experiment was undertaken to find out the effects of time operation and rooting media on the success of air-layering in guava with a view to determine the optimum time of air-layering to observe the performance of rooting media and to find out the combined effect of time of air layering and rooting media on rooting success.

Methodology:

Guava trees of the variety BAU-5 were selected for performing air layering. The experiment comprised two factors viz. time of air layering (A) and rooting media (B). There were 5 levels of the factor A viz. March, 2011 (T1), April, 2011 (T2), May, 2011 (T3), June, 2011 (T4) and July, 2011 (T5) and 11 levels of factor B viz. 50% cow dung + 50% loamy soil (M1), 50% cow dung + 50% saw dust (M2), 50% compost + 50% loamy soil (M3), 50% cow dung + 50% coconut coir (M4), 100% cow dung (M5), 100% loamy soil (M6), 100% compost (M7), 100% moss (M8), 25% cow dung + 75% loamy soil (M9), 25% loamy soil + 75% cow dung (M10) and 100% saw dust (M11). The two factor experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. In the experiment 165 shoots were used for layering operation. For air layering healthy, disease free, lateral shoots of green to deep brown coloured branch with approximate diameter from 0.847 to 2.54 cm as juvenile shoot were selected according to Li and Li (1949). In case of old shoot approximately more than 1 year old mature light brown to grayish coloured branch were selected according to Hartmann and Kestar (1959). Careful observations were also made to ensure that the selected branches had sufficient leaves on them. In the 1st week of March, April, May, June and July, 2011 air layering were done by removing 3 cm long bark in the form of ring just below a node and about 50 cm away from shoot tip and then scrapping of the exposed wood to remove the cambium layer from them was done with the help of knife. The exposed wood was then covered with moistened rooting medium. To cover the mixture completely a piece of clear polythene sheet (size: 20 cm × 15 cm) was wrapped. The two ends of the wrapping material were carefully tied up thoroughly with thin rope and left for rooting. The layers were separated from the mother plant after 45 days of operation when the outer surface of rooting medium within the wrapped polyethylene sheet was full of newly formed roots. Data on percentage of success in rooting, number of roots per layers and length of the longest root was recorded after detachment of the layers from the mother plant. The mean for all the treatments were calculated and analyses of variances of parameters under study were performed by F variance test. The mean differences were compared by Least Significant Difference (LSD) test at 5% level of probability.

Source of Information: J. Sylhet Agril. Univ. 1(1):23-27, 2014 ISSN: 2308-1597

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In conclusion, it can be stated that time and rooting media have tremendous effect on the success of air layering in guava. The overall results obtained from this study reveal that in context of Mymensingh region of Bangladesh May and June is the optimum time for better rooting of air layering in guava when compost or moss is used as rooting media.

Knowledge Management: Journal