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Effects of Foliar Application of Growth Regulators on Quality Seed Yield in Carrot

M. A. Malek
Department of Horticulture, Patuakhali Science and Technology University, Patuakhali

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

K. Begum
Department of Agriculture Extension, Khamarbari, Farmgate, Dhaka

Abstract/ Executive Summary:

The experiment was conducted at Horticulture Farm, Bangladesh Agricultural University, Mymensingh during rabi season of 2010-2011. Different levels of growth regulators viz. GA3 100 ppm, GA3 150 ppm, GA3 200 ppm, GA3 250 ppm, IAA 100 ppm, IAA 150 ppm, IAA 200 ppm and IAA 250 ppm were used to investigate the effects of growth regulators and to determine the appropriate dose on fruit setting and seed yield of carrot. Application of growth regulators had a profound influence on plant height, days to 50% flowering, days required from flower to fruit set, number of primary and secondary umbels, seed yield plant^-1 and ha^-1, 1000-seed weight, seed germination % and seed vigour index. Among the treatments, GA3 150 ppm was the best to influence the yield and quality contributing traits. GA3 150 ppm gave the highest seed yield (1283.07 kg ha^-1) and superior quality of seed (germination 86.56% and seed vigour index 12.34) followed by 1228.53 kg ha^-1 seed yield from growth regulators level of GA3 200 ppm.

Keywords: Growth regulators, Carrot seed quality, Yield

Location: Horticulture Farm, Bangladesh Agricultural University, Mymensingh

Start Date: 00-11-2010

End Date: 00-03-2011

Program Area: Seed Technology

Commodity: Carrot

Objectives:

1. To investigate the effect of growth regulators and appropriate dose on fruit setting and seed yield and quality of carrot.

Methodology:

The experiment was carried out during rabi season of 2010-2011 with a view to studying the effects of different levels of growth regulators. The field experiment was laid out in the randomized complete block design with three replications. Nine levels of the following growth regulators consisting of i) Control ii) GA3 100 ppm iii) GA3 150 ppm iv) GA3 200 ppm v) GA3 250 ppm vi) IAA 100 ppm vii) IAA 150 ppm viii) IAA 200 ppm and ix) IAA 250 ppm were used. The selected land was medium high and the texture of soil was clay loam. The experimental plot was prepared by good tillage. The entire amounts of fertilizers were mixed with the soil as per recommended dose of BARC (2005). Urea and MoP were used in the same plot in three equal installments viz. one as basal dose during plot preparation and another two dose as top dressing at 15 and 40 days after transplanting of steckling. The seed of carrot variety Brasilia Agroflora was collected from USDA-Alliums’ project, BAU, Mymensingh. All intercultural operations were done as and when needed. Seeds were sown uniformly in rows on 20 October, 2010. When the plants were 75-day old, they were transplanted at main field. Powder form of GA3 (99%) at first mixed with 2ml ethanol and then add distilled water as per required treatments in a measuring cylinder prior to spray. IAA direct mixed with distilled water and then prepared as per required dose. Plant growth regulators was sprayed two times after 25 and 40 days of transplanting of steckling as foliar spray during growth by hand sprayer. The control plot was sprayed with tap water. The umbels of carrot turned yellow to light gray showing the sign of drying and were ready for harvesting. Data were recorded on plant growth and flowering behavior, yield and quality contributing traits of carrot from five randomly selected plants of each plot. The collected data were statistically analyzed and the mean differences were tested using the Least Significant Difference test taking the probability level 5% as the minimum unit of significance.

Source of Information: J. Agrofor. Environ. 7 (2): 135-138, 2013; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Application of growth regulators had a profound influence on plant height, days to 50% flowering, days required from flower to fruit set, number of primary and secondary umbels, seed yield plant^-1 and ha^-1, 1000-seed weight, seed germination % and seed vigour index. Among the treatments, GA3 150 ppm was the best to influence the yield and quality contributing traits. GA3 150 ppm gave the highest seed yield (1283.07 kg ha^-1) and superior quality of seed (germination 86.56% and seed vigour index 12.34) followed by 1228.53 kg ha^-1 seed yield from growth regulators level of GA3 200 ppm.

Knowledge Management: Journal