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Effect of Scion Defoliation and Stock Leaf Retention on the Graft Height of Lime

A. NAHAR
Department of Horticulture, Bangladesh Agricultural University, Mymensingh, Bangladesh

M.S.H. CHOUDHURY
Department of Horticulture, Bangladesh Agricultural University, Mymensingh, Bangladesh

M.A. RAHIM
Department of Horticulture, Bangladesh Agricultural University, Mymensingh, Bangladesh

S. RAY
Department of Agronomy, Bangladesh Agricultural University, Mymensingh, Bangladesh

K.R. DAS
Department of Entomology, Bangladesh Agricultural University, Mymensingh, Bangladesh.

Abstract/ Executive Summary:

The present experiment was conducted at the Germplasm Centre (GPC) of the Fruit Tree Improvement Program (FTIP), Bangladesh Agricultural University, Mymensingh, during the period from June to October, 2013 to investigate the effects of scion defoliation and stock leaf retention on the graft height of Lime (cv. BAU lime-1). The experiment consisted of two factors such as Factor A: four scion defoliation periods viz., defoliation before 9 days of grafting, defoliation before 6 days of grafting, defoliation before 3 days of grafting and defoliation on the day of grafting and Factor B: retention of leaf on rootstock below graft union viz., rootstock with leaf and rootstock without leaf. The study was laid out following Randomized Complete Block Design (RCBD) with three replications. The grafts were kept under observation in poly tunnel condition. Results revealed that highest graft height (45.47 cm) was observed when scions were defoliated 6 days before grafting and lowest graft height (38.72 cm) was observed when scions were defoliated on the day of grafting. In respect of retention of leaves on rootstock, the highest graft height (43.83 cm) was found when grafting was done on rootstock with leaves and lowest graft height (39.78 cm) was found when grafting was done on rootstock without leaves. Therefore, the maximum graft height in lime can be achieved if scion defoliated 6 days prior to grafting operation and leaves are kept on root stock below graft union.

Keywords: Scion defoliation, stock leaf retention, graft height, lime

Location: BAU Germplasm Centre (GPC), Bangladesh Agricultural University, Mymensingh

Start Date: 00-06-2013

End Date: 00-10-2013

Program Area: Crop-Soil-Water Management

Commodity: Lemon

Objectives:

To investigate the effects of scion leaf defoliation and stock leaf retention of cleft grafting on the graft height of lime

Methodology:

The present experiment was conducted at the ‘BAU Germplasm Centre (GPC) of Fruit Tree Improvement Program (FTIP), Bangladesh Agricultural University, Mymensingh during the period from June to October, 2013. High yielding cultivar namely FTIP BAU Kagozi Lebu-1 (Semi-seedless) was used in this study. The rootstocks used in the experiment were raised in polybag from the lemon seeds of unknown variety. The scion shoots used, were collected from mother plants of lime (cv. BAU Lebu-1). The two-factor experiment consisting of 8 treatment combinations was laid out in Randomized Complete Block Design (RCBD) with three replications. For each treatment combination grafting operations were performed on twenty rootstocks of each plot of a block. Thus in total 4×2×3×20 = 240 grafts were made. The experiment consisted of two factors, Factor A: scion defoliation period viz., Defoliation before 9 days of grafting, Defoliation before 6 days of grafting, Defoliation before 3 days of grafting, Defoliation on the day of grafting and Factor B: Stock leaf retention viz., Rootstock with leaves below graft union Rootstock without leaves below graft union. Data on graft height at 30, 60, 90 days after grafting were collected and were statistically analyzed to find out the significance of differences between the treatments and treatment combinations. The means of all the treatments were calculated and the analyses of variances (ANOVA) for all the characters were performed by ‘F’ variance test. The significance of differences between treatments means were compared by Least Significant Difference (LSD) test.

Source of Information: Int. J. Sustain. Crop Prod. 10(4):23-25, (2015)

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Different scion leaf defoliation period and stock leaf retention significantly influenced the graft height of the grafted plants. From the results, it reveals that lime can be propagated by grafting using pre-cured scion and keeping leaves below grafting union for better establishment of graft union and also for rapid growth of the grafted plants. But for the highest graft height grafting should be done using scions defoliated 6 days before grafting keeping leaves on root stock below graft union.

Knowledge Management: Journal