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Effect of Variety and Pruning of Umbel on Yield and Quality of Carrot Seed

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

M. Sikder
Metal Agro Limited, Salna, Gazipur

D. Mohammed
Public Relations and Publications Section, Bangladesh Agricultural Unversity, Mymensingh

Abstract/ Executive Summary:

The study was carried out to investigate the effect of variety and umbel pruning on quality seed production of carrot using three varieties viz. Brasilia Agroflora, Prima Agroflora, New Kuroda, and four different pruning level of umbel viz. control (keep all umbels), only primary umbels, only secondary umbels, and primary & secondary umbels. The two-factor experiment was laid out in RCBD with three replications. Different variety and umbel pruning showed highly significant influence on all most all the parameters studied. The highest seed yield (1222.75 kg/ha) and quality of seed (germination 85.43% and seed vigour index 11.06) were obtained from Brasilia Agroflora, while the lowest seed yield (1140.75 kg/ha) and quality of seed (germination 79.33% and seed vigour index 10.85) from New Kuroda. The primary & secondary umbels produced the highest seed yield (1341.37 kg/ha), while the lowest seed yield (1013.23 kg/ha) from only secondary umbels. The highest quality of seed (germination 89.57% and vigour index 11.39) exhibited only primary umbels whereas, the lowest (76.39%; 10.48) from control (keep all umbels). In case of combined effects, the highest seed yield (1379.55 kg/ha) was produced from Brasilia Agroflora with primary & secondary umbels, while the lowest from New Kuroda with only secondary umbels (967.79 kg/ha). Considering the quality, the highest germination (92.11%) and vigour index (11.52) obtained from Brasilia Agroflora with only primary umbels while the lowest (70.56%; 10.39) from New Kuroda with control (keep all umbels).

Keywords: Carrot, Variety, Umbel prunings, Yield, Quality seed

Location: Horticulture Farm, Bangladesh Agricultural University, Mymensingh

Start Date: 00-10-2010

End Date: 00-06-2011

Program Area: Variety and Species

Commodity: Carrot

Objectives:

1. The present study was undertaken to find out the suitable variety and umbel pruning on yield and quality of carrot seed.

Methodology:

The experiment was conducted at Horticulture Farm, Bangladesh Agricultural University, Mymensingh during October, 2010 to June, 2011. The treatments of the experiment consisting of three varieties of carrot viz, Brasilia Agroflora, Prima Agroflora and New Kuroda and four different umbel keeping, viz., control (keep all umbels), only primary umbels, only secondary umbels, and primary & secondary umbels were maintained. The unit plot size was 1mx1m. Date of stecklings transplanting: 1 December’10. Date of harvesting: 7 April to 10 May, 2011. The selected land was medium high and the texture of soil was clay loam. The two-factor experiment was laid out RCBD with three replications. The experimental plot was prepared by good tillage and fertilized with recommended doses of manure and fertilizers. The seeds of varieties were collected from USDA-Alliums project, Department of Horticulture, BAU, Mymensingh. All intercultural operations were done as and when needed. Seeds were sown uniformly in rows on 15 September, 2010. The 75 days old plants were transplanted in the main field. The matured umbels were harvested in several installments, when the umbel turned into grayish in colour. Seeds were then collected by hand rubbing, cleaned and dried until they reached safe moisture level (8-10%). After 30 days of storage, the seeds of each treatment were placed for germination test and measure vigour index in petridishes taking 100 seeds for each treatment with blotting papers in the laboratory. The seed vigour was measured through its speed of germination. The germinated seeds were counted every day until germination was completed. An index of the speed of germination was then calculated by adding the quotients of the daily counts divided by the number of days of germination using the formula as: Seed vigour index = (No. of seed germinated at first count/No. of days required to first count) + …….. + (No. of seed germinated at last count/No. of days to last count). Thus the seeds with higher index has faster germination rate and would be considered to be higher in vigour. Data were recorded on vegetative growth and flowering behavior, umbel characteristics, yield and quality contributing characteristics of carrot from five randomly selected plants of each plot and were analyzed statistically by Mstatc computer programme. The difference between the treatment means was adjudging by least significant difference (LSD) test.

Source of Information: J. Agrofor. Environ. 5 (2): 45-48, 2011; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The highest seed yield in primary umbels (1.07g) was observed in Brasilia Agroflora with only primary umbels while New Kuroda with control (keep all umbels) demonstrated the lowest seed yield (0.67g). The highest seed yield in secondary umbels (0.52g) was observed in Brasilia Agroflora with only secondary umbels while New Kuroda with control (keep all umbels) exhibited the lowest seed yield (0.30g). Brasilia Agroflora with primary & secondary umbels gave the highest seed yield/plant and yield/ha (8.65g & 1379.55 kg) whereas it was the lowest (6.11g & 967.79 kg) in New Kuroda with only secondary umbel. This might be due to higher umbel size, number of flower/umbel and number of seeds/umbel. The highest quality of seed (germination 92.11% and vigour index 11.52) were exhibited in Brasilia Agroflora with only primary umbels while the lowest (70.56% & 10.39) was observed in New Kuroda variety with control (keep all umbels). This might be due to higher 1000-seed weight which enhanced the speed of germination.

Knowledge Management: Journal