Citation
Hawa Z.E Jaafar, . (2004) Growth responses of Brassica chinensis var. chinensis under CO‚‚- enriched controlled environment production system in the tropical lowlands. [Proceedings Paper]
Abstract
A prototype capable of CO‚‚ enrichment was developed to investigate the possibility of establishing CO‚‚ enrichment technique for controlled environment CE production system in the hot and humid lowland tropics. A model crop Brassica chinensis var. chinensis was used to demonstrate the impact of the established CO‚‚ enrichment technique on growth and development. Four levels of CO‚‚ enrichment viz. ambient as control 350 ppm 750 ppm double CO‚‚ 950 ppm triple CO‚‚ and 1150 ppm quadruple CO‚‚ were imposed on to 7-day Brassica chinensis var. chinensis seedlings. The growth responses were investigated by measuring the plant height leaf area and leaf number and biomass accumulation. Both the fresh and dry biomass accumulation increased with increasing carbon dioxide concentration between 22.6 and 36.5 and 16.5 and 23.5 respectively in the prototypes. The increased biomass could have resulted from the enhanced root growth and leaf area by ascending CO‚‚ enrichment. When enriched with carbon dioxide root fresh weight increased between 26 and 47. Consecutively the leaf area expanded by nearly 20 1117 cm‚‚ at 1150 ppm CO‚‚ enrichment level 13 1063 cm‚‚ and 14 1074 cm‚‚ at respective 950 and 750 ppm CO‚‚ enrichment levels compared to 942 cm‚‚ area at ambient CO‚‚ level. The leaf area was also positively correlated with carbon dioxide concentrations. Similarly plant height was enhanced by high carbon dioxide concentration in a descending manner1150 ppm 31.4 cm 750 ppm 30.7 cm 950 ppm 29.9 cm ambient 350 ppm 28.9 cm. The number of leaves however decreased when the highest level of CO‚‚ enrichment 1150 ppm was imposed although slightly higher leaf numbers were produced when carbon dioxide doubled the ambient concentration. The positive growth responses of Brassica chinensis var. chinensis in many of the vegetative parameters with increasing carbon dioxide concentration implied that a CO‚‚ enrichment technique established for CE production system for the lowland tropics was feasible and the prototype practical.
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Abstract
A prototype capable of CO‚‚ enrichment was developed to investigate the possibility of establishing CO‚‚ enrichment technique for controlled environment CE production system in the hot and humid lowland tropics. A model crop Brassica chinensis var. chinensis was used to demonstrate the impact of the established CO‚‚ enrichment technique on growth and development. Four levels of CO‚‚ enrichment viz. ambient as control 350 ppm 750 ppm double CO‚‚ 950 ppm triple CO‚‚ and 1150 ppm quadruple CO‚‚ were imposed on to 7-day Brassica chinensis var. chinensis seedlings. The growth responses were investigated by measuring the plant height leaf area and leaf number and biomass accumulation. Both the fresh and dry biomass accumulation increased with increasing carbon dioxide concentration between 22.6 and 36.5 and 16.5 and 23.5 respectively in the prototypes. The increased biomass could have resulted from the enhanced root growth and leaf area by ascending CO‚‚ enrichment. When enriched with carbon dioxide root fresh weight increased between 26 and 47. Consecutively the leaf area expanded by nearly 20 1117 cm‚‚ at 1150 ppm CO‚‚ enrichment level 13 1063 cm‚‚ and 14 1074 cm‚‚ at respective 950 and 750 ppm CO‚‚ enrichment levels compared to 942 cm‚‚ area at ambient CO‚‚ level. The leaf area was also positively correlated with carbon dioxide concentrations. Similarly plant height was enhanced by high carbon dioxide concentration in a descending manner1150 ppm 31.4 cm 750 ppm 30.7 cm 950 ppm 29.9 cm ambient 350 ppm 28.9 cm. The number of leaves however decreased when the highest level of CO‚‚ enrichment 1150 ppm was imposed although slightly higher leaf numbers were produced when carbon dioxide doubled the ambient concentration. The positive growth responses of Brassica chinensis var. chinensis in many of the vegetative parameters with increasing carbon dioxide concentration implied that a CO‚‚ enrichment technique established for CE production system for the lowland tropics was feasible and the prototype practical.
Additional Metadata
| Item Type: | Proceedings Paper |
|---|---|
| Additional Information: | Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. QK710.2 M239 2004 Call Number |
| AGROVOC Term: | Brassica chinensis |
| AGROVOC Term: | Prototypes |
| AGROVOC Term: | CO2 |
| AGROVOC Term: | Atmospheric CO2 |
| AGROVOC Term: | Carbon dioxide enrichment |
| AGROVOC Term: | Greenhouse effect |
| AGROVOC Term: | Computer systems applications |
| AGROVOC Term: | Computer software |
| AGROVOC Term: | Control systems |
| AGROVOC Term: | Controlled environment |
| Geographical Term: | MALAYSIA |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 05:15 |
| URI: | http://webagris.upm.edu.my/id/eprint/12743 |
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