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Effect of Boron and Ga3 on Yield and Quality of Onion Seed

M.A. Malek
Assistant Professor
Dept. of Horticulture, PSTU, Patuakhali.

M.S. Rahman
Scientific Officer
RARS, BARI, Akbarpur, Moulvibazar.

S.M.S. Firoj
DAE, Khamarbari, Dhaka.

Abstract/ Executive Summary:

An experiment was conducted to study the effect of boron and concentration of GA₃ on quality seed production of onion. There were three levels of boron, viz., 0, 2 and 3 kg B ha^-1, and four concentration of GA₃, viz., 0, 50, 100 and 150 ppm. The two-factor experiment was laid out in RCBD with three replications. Application of boron and foliar spray of GA₃ showed highly significant influence of all the parameters studied. The highest seed yield (670.50 kg ha^-1) and germination of seed (82.51%) were found from 2 kg B ha^-1, while the lowest seed yield (386.58 kg ha^-1) and germination (67.69%) were obtained from control (0 kg B ha^-1) treatment. The lowest days to 50% flowering (46.83) was found from 2 kg B ha^-1 and the highest days (49.65) from control treatment. Foliar spray of 100 ppm concentration of GA3 gave the highest seed yield (613.29 kg ha^-1) and germination (80.78%), while the lowest seed yield (455.39 kg ha^-1) and germination (70.65%) were obtained from control (0 ppm GA₃) treatment. The lowest days to 50% flowering (46.68) was found from 100 ppm and the highest days (50.74) from control treatment of GA3. In the treatment combinations, 2 kg B ha^-1 with foliar spray of 100 ppm GA₃ produced the highest seed yield (780.05 kg ha^-1) and quality of seed (89.59%) germination as well as shortest time of 50% flowering (45.76 days).

Keywords: Boron, GA3, Seed yield, Quality, Onion.

Location: Horticulture Farm, Bangladesh Agricultural University, Mymensingh.

Start Date: 00-11-2010

End Date: 00-05-2011

Program Area: Seed Technology

Commodity: Onion

Objectives:

To find out the optimum dose of boron and GA3 for maximizing the yield and quality of onion seed.

Methodology:

The present study was conducted at the Horticulture Farm, Bangladesh Agricultural University, Mymensingh during the period from November, 2010 to May, 2011. The soil was silty loam in texture with a pH of 6.85. Planting material was uniform bulbs of onion variety cv. BARI Piaz 1. The average weight of the bulbs was 7.5 g. The two-factor experiment was laid out in RCBD with three replications. The size of each unit plot was 1.0m X 1.0m. Cowdung, urea, TSP, MP, ZnSO₄ and gypsum were applied to each plot @ 10 t/ha, 250, 200, 160, 20 and 120 kg ha^-1, respectively (SRC, 2003). The entire amount of cowdung was applied after opening of land. The total amount of TSP and half of the MP were applied during the final land preparation. Total urea and remaining MP were applied in three installments after 25, 45 and 60 days of planting as top dressing. Boron in the form of borax was applied as per treatment during final land preparation and GA₃ was sprayed at 25 and 40 days after emergence of bulbs as foliar spray. The planting of bulbs was done on 1 November, 2010. Row to row distance was 25 cm and plant to plant distance in each row was 20 cm. Gap filling, weeding, mulching, staking, irrigation and plant protection measure were done as and when needed. The matured umbels were harvested in several installments when about 15-20% of the fruits had black seed exposed. Seeds were then cleaned and dried until they reached safe moisture level (6-9%). After 45 days of storage, the seeds of each treatment were placed for germination test in petridishes taking 100 seeds for each treatment with blotting papers in the laboratory. Data were collected from randomly selected 6 plants for each treatment on plant growth, yield and quality contributing characters and were statistically analyzed.

Source of Information: Bangladesh J. Seed Sci. & Tech. 15 (1&2): 75-79(2011),ISSN 1029-8800

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In conclusion, it can be studied that 2 kg B ha-1 and spraying 100 ppm concentration of GA₃ might be used in onion seed production to obtain maximum quality yield.

Knowledge Management: Journal