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Effect of Growth Regulators on the Growth, Yield and Ascorbic Acid Content of Cabbage

M.A. lslam
Horticulture Division, Bangladesh AgriculturalResearch Institute, Joydebpur, Gazipur.

Ayesha Siddiqua
Department of Biochemistry, Bangladesh Agricultural University, Mymensingh.

M. A. Kashem
Department of Biochemistry, Bangladesh Agricultural University, Mymensingh.

Abstract/ Executive Summary:

A study of the effect of different levels of napthalene acetic acid (NAA) and gibberellic acid (GA) adopting different mmethod of application on the growth,yield and ascorbic acid contents of a local variety of cabbage was made. Spraying the plants with 50 ppm each of NAA and GA at 15 day interval caused higher growth. Gibberellic acid appeared to have more potential than NAA.

Keywords: Growth regulators, Ascorbic acid, Growth.

Location: In Horticulture Farm, Bangladesh Agricultural University, Mymensingh.

Start Date: 00-00-1989

End Date: 00-00-1989

Program Area: Crop-Soil-Water Management

Commodity: Cabbage

Objectives:

To find out the effective concentration of NAA and GA that will promote growth,yield and ascorbic acid content of cabbage.

Methodology:

In the present investigation, cabbage variety Atlas 70 was grown during the winter season of 1989 in Horticulture Farm, Bangladesh Agricultural University, Mymensingh. The experiment was laid out in a split-plot design replicated thrice, with three different methods of application o f two growth regulators, ie, seedling soaked for 12 hours (S 1),once spray at 15 days (S1) of trans-plantation and twice spraying at 15 days )(G6), 25 ppm (G 6), 5 ppm (67 ). 100 ppm (G8) of Gibberellic acid (GA) and distilled water (G 1) as control in the sub-plots. The experimental soil was silty loam with pH range from 6.8 to7.0. Twenty five days old seedlings were transplanted in five row plots of size 2.4m X 2.4m each. Row to row and pla'1t to plant spacing was main rained a t 60cm and 60cm respectively. Ten tons cow dung, 500 kg mustard oil cake, 375 kg urea, 225 kg triple super phosphate and 275 kg muriate of potash per hectare ware applied as fertilizers. Cow dung and triple super phosphate were applied before final land preparation whereas 50% urea and muriate of potash wero appli&d after 15 days of transplanting. The rest doses of fertilizer s were applied after 15 days of first top dress. The crops were harvested after six months .

Source of Information: Bangladesh J. Agril. Sci. 20 (1): 21-27 :January, 1993 ISSN 0379-4296

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The maximum amount of ascorbic acid was found with the application of twice spray of growth regulators with GA and NAA. It was statistically Identical to single spray but was superior to seedling soaking treatment. Ascorbic acid content showed an In creasing trend upto 50 ppm with twice spray while its content was declined afterwards. It revealed that excessive doses of growth r regulators were not suitable for the accumulation of ascorbic acid. Fifty ppm was found to be a suitable dose for ascorbic acid accumulation end such findings were also reported by many workers (Singh and Seimbhi, 1969 ).Table 3 showed t hat GA treatment caused 17% mote ascorbic acid while NAA showed 14% more ascorbic acid than the control. Growth regulators increase the sugar concentration of plant . Thus the maximum amount of ascorbicc acid is derived from sugar via gluconooxldase enzyme activities.Baaed on the discussion above. it is evident that twice spray with 50 ppm GA Is suitable dose both for higher yield and ascorbic acid content of cabbage.

Knowledge Management: Journal