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Effects of Different Levels of Sulphur on Growth, Sulphur Content and Uptake by Onion Plant

M. H. Ullah
Regional Agricultural Research Station, BARI, Rahmatpur, Barisal.

S. M. Imamul huq
Department of Soil, Water and Environment, University of Dhaka, Bangladesh.

M. D. U. Alam
Department of Soil, Water and Environment, University of Dhaka, Bangladesh.

M. A. Rahman
Regional Agricultural Research Station, BARI, Rahmatpur, Barisal.

Abstract/ Executive Summary:

The field experiment was conducted at the Regional Agricultural Research Station. Rahmotpur, Barisal during the rabi season of 2001-2002 and 2002-2003 to examine the effects of' different levels of' sulphur (S) on growth, S content and uptake by onion plant. The experimental results showed that S levels had the significant effect on plant growth in terms of plant height, number of leaves/plant, pseudostem length and diameter, horizontal & vertical diameter of onion bulb and total dry matter weight. The S con rent and uptake were also significantly affected by different levels of S. Application of 75 kg S/ha gave significantly the highest weight of total dry matter which contributed to the maximum yield of onion bulb. The same treatment (S 75 kg/ha) also gave significantly the highest value in respect of'S content and uptake in onion plant. Therefore, considering the soil fertility in the Southern region of Bangladesh, 60 to 75 kg S/ha can be applied to the onion crop for its proper growth and maximum bulb yield but further application ofS may cause toxicity in the soil along with yield reduction

Keywords: Sulphur, Growth, Sulphur content & Uptake, Onion

Location: Regional Agricultural Research Station, BARI, Rahmatpur, Barisal

Start Date: 00-00-2001

End Date: 00-00-2003

Program Area: Crop-Soil-Water Management

Commodity: Onion

Objectives:

To study the effects of sulphur on plant growth, sulphur content and uptake by onion plant.

Methodology:

The experiment was conducted at the Regional Agricultural Research Station, Rahmatpur, Barisal during rahi seasons of two consecutive years from 2001-2002 to 2002-2003. The experimental soil belongs to the Ganges Tidal Floodplain Alluvium Tract under AEZ-13. Prior to experimentation, composite soil samples (0-15 cm depth) were collected from the selected fields for determining its nutrient status. The soil analytical results showed that the initial availability of Mg, K and Zn nutrients in soil were above the critical levels but the availability of Ca, NH4-N, P and S were below critical levels. The experiment was laid out in randomized complete block design (RCBD) with four replications. The unit plot size was 3 m x 4 m. Eight levels of sulphur (So, S15, S3o, S45, S6o, S75, S9o and S10s kg /ha) were taken as treatment while N100 Pso K1oo kg/ha .and Cow dung 5t/ha were used as a blanket dose. The 45 days old onion seedlings (var. BARI Piaz-1) were transplanted on 28-30 December in 2001 and 2002. The plant spacing was 20 cm x I0 cm. Irrigation, weeding and mulching were done as per requirement of the crop for its proper growth. As a prevention measure of cutworm (Agrotis ypsilon), Furadan 3 G @ 20 kg/ha was applied into the soil. Similarly, Rovral 50 WP @ 3 g/litre water was sprayed for controlling purple blotch disease of onion caused by Alternaria porri. The flower stalks were nipped off for stopping the bolting in onion plant whenever they appeared in the plots. Plant samples were collected from each plot at 35, 50, 65 and 80 DAT for collecting field and periodical data regarding different growth parameters of onion plant. The plant samples were first air-dried and thereafter oven dried at 65° C for 48 hours. The samples were then finely grinded using a wiley mill with stainless contact points to pass through a 60-mesh sieve and were stored in sealed polythene bags for S determination. The S concentration 111 the digest was estimated turbidimetrically by spectrophotometer using 420 nm wavelengths. The crop was harvested on 4-7 April in 2002 and 2003 when 80% of the plants showed maturity symptoms and yield data were taken plot wise. Then all the collected data were analyzed statistically by using MSTAT-C computer software and means were separated followed by Duncan's Multiple Range Test.

Source of Information: Bangladesh Journal of Soil Science. 36(1-2): 9-16, 2010

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The S con rent and uptake were also significantly affected by different levels of S. Application of 75 kg S/ha gave significantly the highest weight of total dry matter which contributed to the maximum yield of' onion bulb. The same treatment (S 75 kg/ha) also gave significantly the highest value in respect of' S content and uptake in onion plant. Therefore, considering the soil fertility in the Southern region of Bangladesh, 60 to 75 kg S/ha can be applied to the onion crop for its proper growth and maximum bulb yield but further application of S may cause toxicity in the soil along with yield reduction.

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