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Effect of Different Post Detachment Conditions on the Survivability and Growth Performance of Two Varieties of Guava Air-layers

A.J. Kakon
Department of Horticulture, Fruit Tree Improvement Project, Bangladesh Agricultural University, Mymensingh, Bangladesh.

M.A. Rahim
Department of Horticulture, Fruit Tree Improvement Project, Bangladesh Agricultural University, Mymensingh, Bangladesh.

M.S. Alam
Department of Horticulture, Fruit Tree Improvement Project, Bangladesh Agricultural University, Mymensingh, Bangladesh.

Abstract/ Executive Summary:

An experiment was conducted to study the effect of variety and different nursery conditions on the survivability of air-layers of two varieties of guava at the Germplasm Centre (GPC) of Fruit Tree Improvement Project, Department of Horticulture, Bangladesh Agricultural University, Mymensingh during the period from August 2001 to July 2002. Planting air-layer after detached from the mother plant and planted under different nursery conditions showed significant variation in success of air-layers. Open condition (both layers in poly bag and layers in situ) increased the percentage of survivability then under shade condition. Layers in situ (both shade and open condition) increased the number of shoots and leaves of the detached air-layers than layers in polybag. The highest percentage of survivability (100%) was observed from layers in situ under open condition which was statistically similar to layers in polybag under open condition.

Keywords: Guava, Air-layers, Different nursery conditions, Survivability, Growth performance

Location: Germplasm Centre of Fruit Tree Improvement Project (FTIP), Bangladesh Agricultural University, Mymensingh

Start Date: 00-08-2001

End Date: 00-07-2002

Program Area: Crop-Soil-Water Management

Commodity: Guava

Objectives:

To the different nursery conditions of guava air-layers on their survivability and growth performance.

Methodology:

The present research work was carried out at the Germplasm Centre of Fruit Tree Improvement Project (FTIP), Bangladesh Agricultural University, Mymensingh during the period from August, 2001 to July, 2002 to study the effect of different nursery conditions on the survivability and growth performance of air-layers of two varieties of guava. Two varieties namely Swarupkathi (V₁), Madhuri (V₂) and four different conditions in the nursery maintained for layers after detachment namely layers in polybag under shade condition (M₁)-Artificial shade with coconut leaves, layers in polybag in open condition (M₂), layers in situ under shade (M₃), layers in situ in open condition (M₄) were practiced on the detached air-layered shoots. For guava air-layering healthy, disease free, lateral shoots of approximately 1-year-old and preferably from previous years growth was selected. The approximate diameter of branches were taken as 1.0 to 1.5 cm and this was done according to Ruehle. In the month of August, 2001 guava air-layer was done by removal of 3 cm long bark cylinder and then scrapping the exposed wood to remove the cambium layer from above them with the help of a sharp knife. The wood was then covered with moistened rooting medium. To cover the mixture completely a 0.65 m² piece of clear polyethylene sheet was used. The ends of the wrapping materials were carefully tied up thoroughly with rope and left for rooting. A well leveled land was selected for the layers planting. The nursery bed was prepared before detachment of the layer from the mother plant. The nursery bed was prepared by opening the soil with a spade and followed by laddering to break the soil clods and to level the surface before planting. No chemical fertilizers were used in the soil. Well rotten cowdung (20 m t ha^-1) was applied at the time of land preparation. The bed was cleaned by collecting and removing weeds, stubbles, stones etc. After detachment from the mother plant, pruning of 75% leaf of each layer, i.e. allowing 25% of leaves to remain with the layers. Then the layers were planted in nursery bed directly and planted in polybag. Layers of guava and litchi were planted in the afternoon at a spacing of 25x25 cm and immediately after planting watering was done uniformly by watering can. Some of the layers were planted in open air and some were placed in shade condition. Shading was provided with coconut leaves at a height of 3 m after planting to protect the layers from excessive rainfall and sunlight. Proper care was taken in the nursery bed so that, the growth of air-layers was adequate. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications number of shoots and no of leaves per successful layers were recorded at 15 days interval starting from 35 days after planting and was continued up to 320 days. Percentage of success in the survivability of detached rooted layers was counted after 2 months from the date of planting, the number of successfully air-layers (root initiation) were counted after 35 days from the date of operation. The collected data on different parameters under different experiments were statistically analysed wherever necessary. The mean for all treatments were calculated and analyses of variances for all the parameters/characters under consideration were performed by F variance test using MSTAT program. The significance of difference between pair of means was expressed as Least Significant Difference (LSD) test.

Source of Information: Asian Journal of Plant Sciences, 4(2): 149-153, 2005 (ISSN 1682-3974)

Article Link (Online Journal): http://scialert.net/fulltext/?doi=ajps.2005.149.153&org=11

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Open condition (both layers in poly bag and layers in situ) increased the percentage of survivability then under shade condition. Layers in situ increased the number of shoots and leaves of the detached air-layers than layers in polybag. The highest percentage of survivability (100%) was observed from layers in situ under open condition which was statistically similar to layers in polybag under open condition.

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