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Effect of Zine and Cold Treatment of Bulbs 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
UAO (LR), DAE, Khamarbari, Dhaka.

Abstract/ Executive Summary:

The study was carried out to investigate the effects of zinc and cold treatment of bulbs on yield and quality of onion seed. The two-factor experiment was laid out with the variety cv. Taherpuri using four levels of zinc, viz., 0, 4, 8 and 12 kg Zn ha^-1 and three levels of per-planting cold treatment, viz., 8⁰C, 12⁰C and ambient (20⁰C - 25⁰C as control) temperature. The results of the study revealed that zinc and cold treatment of planting bulbs were highly significant on the growth, yield and quality of onion seed. The growth as well as seed production ability of the plants was increased up to 8 kg Zn ha^-1. Maximum yield (697.24 kg ha^-1) and germination of seed (81.59%) were obtained from 8 kg Zn ha^-1, while minimum yield (425.54 kg ha^-1) and germination (70.07%) were obtained from control. The lowest days to 50% flowering (48.25) was found from 8 kg Zn ha^-1 while the highest days (51.66) was recorded from control. The 12⁰C temperature per-planting cold treatment of bulbs produced the highest yield (691.12 kg ha^-1) and germination (82.05%), while the lowest yield (530.56 kg ha^-1) and germination of seed (76.78%) were recorded from control. Again, the lowest days to 50% flowering (47.14) was found from 12⁰C temperature per-planting cold treatment of bulbs and the highest days (52.19) was obtained from control. Regarding combined effects of zinc and cold treatment of bulbs, 8 kg Zn ha^-1 gave the better result when per-planting bulbs were treated with 12⁰C temperature. The quality of seed was also found superior from this combination.

Keywords: Zinc, Cold treatment, Seed yield, Quality, Onion.

Location: Horticulture Farm, Bangladesh Agricultural University, Mymensing.

Start Date: 00-11-2010

End Date: 00-05-2011

Program Area: Seed Technology

Commodity: Onion

Objectives:

To find out the optimum dose of zinc and per-planting cold treatment of bulbs 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. Taherpuri. 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, borax and gypsum were applied to each plot @ 10 t/ha, 250, 200, 160, 10 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. Zinc in the form of ZnSO₄ was applied as per treatment during final land preparation and pre-planting cold treatment of bulbs was done in refrigerator for 1 month. The planting of bulbs was done on 2 November, 2010. Row to row distance was 25 cm and plant to plant distance was 20 cm. Gap filling, weeding, mulching, staking, irrigating 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): 81-85(2011)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In combination, it can be studied that, 8 kg Zn ha^-1with 12⁰C per-planting cold treatment of bulbs may be used in onion seed production to obtain maximum quality yield.

Knowledge Management: Journal