M. B. Sarker
Scientific Officer
Spices Research Center,BARI, Shibganj, Bogra
M. S. Alam
Senior Scientific Officer
Spices Research Center,BARI, Shibganj, Bogra
S .A. Mallik
Director
Spices Research Center,BARI, Shibganj, Bogra
The experiment was conducted at the Spices Research Center, Bogra during August 2011-April 2012 to determine the effect of time of removal of seed bulb from cold storage on the growth and seed yield of onion. The times of removal of onion bulb from cold storage were four weeks, three weeks, two weeks, and one week before planting. It was found that the treatments had significant influence on stalks initiation, stalk/plant, and seed production. The highest yield per ha (988.88kg) was found with removal of seed bulb from cold storage one week before planting which was significantly higher over two, three and four weeks before planting.
COLD STORAGE, GROWTH , ONION, REMOVAL, SEED BULB, SEED YIELD.
Spices Research Center,BARI, Shibganj, Bogra
Variety and Species
To determined the time of removal, temperature and humidity of the cold storage for quality seed production and to remove bulbs from the cold storage and how long the bulb should be acclimatized.
The experiment was conducted at the Spices Research Centre, Shibgonj, and Bogra during August 2011 to April 2012. The seed bulb was stored at a temperature of 30 - 100 c from August 2011 to November 2011. The variety BARI piaz-1 was used in the experiment. Prior to removal of bulb from cold storage, its temperature was gradually increased up to150-180c. Then the bulbs were removed from the cold storage and acclimatized as per treatment. Removals of onion bulb from cold storage (treatments) were: four weeks before planting, three weeks before planting, two weeks before planting and one week before planting. The relative humidity of the cold storage was not under control. Data on weight loss (%), sprouting (%) and rotting during acclimatized period were recorded The bulbs were planted in the fields on 1 November 2012. The experiment was laid out in randomized complete block design (RCBD) with three replications. The unit plot size was 1.2m X2.00m and plant spacing was 25cmX20 cm. The entire amount of cow dung, P, S, Zn, B, 1/4 N and 1/3 K were applied during final land preparation. The rest ¾ of N was applied in three equal splits at 40, 60, and 80 days after sowing. The rest 2/3 of K was applied in two equal splits at 40 and 60 days after sowing. Weeding, irrigation, mulching and other intercultural operations were done as and when required. Fungicide (Ridomil MZ and Rovral @ 2g/l of water) was applied against purple blotch disease. Data were recorded on plant height, stalk/plant, days to 50% stalk initiation, effective stalk/plant/m2, seed/umbel, 1000 seed weight, seed yield and were analyzed statistically.
Spice Research Report 2011-12
The highest number of seed per umbel (883.80) was found with the treatment one week before planting and four week before planting showed the lowest (739.33). The seed yield varied from 773.66 to 988.88 kg/ha , the highest being with the bulb removed one week before planting . The lowest seed yield was recorded with the treatment in which bulbs were removed from the cold storage 4 weeks before planting. The higher yield and yield contributing characters in treatment one week before planting may be attributed to early bulb emergence, longer period of vegetative growth and early stalk initiation.
Removal of onion seed bulb one week before planting from the cold storage was found better with respect to seed bulb quality, growth parameter and seed yield.
Report/Proceedings