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Effect of Three Growth Regulators on Mound Layering Three Varieties of Guava

A. J. Kakon
Mushroom Development Officer
Department of Agronomy & Agricultural Extension, National Mushroom Development and Extension Centre, Savar, Dhaka, Bangladesh.

M. A. Haque
Professor
Department of Agronomy & Agricultural Extension, University of Rajshahi, Bangladesh.

M. G. Mohsin
Lecturer
Department of Agricultural Studies, Nabazug Degree College, Dhamrai, Dhaka, Bangladesh.

Abstract/ Executive Summary:

An experiment was conducted at the Fruit Research Station, Binodpur, Rajshahi during the period from May 2004 to May 2007 to study guava mound layering as affected by different varieties and growth regulators. It was a two factor experiment consisting of three varieties viz. (i) BARI guava-2 and Kashi; and (ii) four concentrations of each growth regulators viz. 300, 500, 800 and 1200 ppm IBA; 300, 500, 800 and 1200 ppm NAA; 300, 500, 800 and 1200 ppm IAA and one control. Among different varieties BARI guava-1 showed the best performance. Different concentrations of growth regulators had significant effect on almost all parameters. IBA at 1200 ppm showed the best performance among the treatments.

Keywords: Guava, Mound layering, Growth regolators

Location: Fruit Research Station, Binodpur, Rajshahi.

Start Date: 01-05-2004

End Date: 31-05-2007

Program Area: Crop-Soil-Water Management

Commodity: Guava

Objectives:

To investigate the effect of different concentrations of growth regulators on guava layering for their survivability and growth performance.

Methodology:

The study was carried out at the Fruit Research Station, Binodpur, Rajshahi during the period from May 2004 to May 2007. There were three varieties of guava namely BARI guava-, BARI guava-2 and Kashi and three growth regulators viz., IBA, NAA and IAA in the study. Each of the growth regulators was applied @ 300, 500, 800 and 1200 ppm. Layers collected through air-layering were planted at 90⁰ angle maintaining a spacing of 90 cm X 70 cm in the month of July, 2004. After establishment, the plants were cut back to 7 cm from ground level and covered with rooting media like a mound. After 15-20 days, large numbers of branches were developed from mother plant. According to the treatment combination, different concentrations of growth regulators in the form of paste were applied on the upper cut end of the exposed shoot. In case of control treatment, the same procedure was followed excepting no use of growth regulators. The treated shoot was then covered with mixture of soil and well decomposed cowdung, sawdust and coconut coir. The rooted layers were separated from the mother plant after 75 days from the date of operation. Moderate pruning was done to the separated layers to check water loss from them through transpiration. Then the layers were planted in polybags and placed in a shady place and watering was done. The experiment was laid out in a Randomized Complete Block Design with three replications. Data were collected on percentage of success in rooting, percentage of survivability, number of roots per layer, length of longest root per layer, fresh and dry weight of roots per layer, number of shoots per layer and number of leaves per layer. The collected data on different parameters were statistically analyzed. The mean for all the treatments were calculated and analyses of variances for all the parameters under consideration were performed by “F” variance test using MSTAT package programme. The significance of differences of means were compared by Least Significant Difference (LSD) test.

Source of Information: SAARC JOURNAL OF AGRICULTURE, Vol. 6, Issue 2, 2008, pp. 39-47, ISSN 1682-8348, SAARC Agricultural Information Centre.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Within some scope and limitation, the study may be concluded that among the guava varieties BARI guava-1 is most appropriate for mound layering. IBA at 1200 ppm showed the best performance in almost all parameters than the other growth regulators of different concentrations used in the experiment. Control treatment showed the lowest performance.

Knowledge Management: Journal