Influence of soil amendments on growth and cadmium accumulation in Ocimum Gratissimum (African Basil) and O Tenuiflorum (Holy Basil)

อิทธิพลของสารปรับปรุงดินต่อการเจริญเติบโตและการสะสมแคดเมียมของ Ocimum Gratissimum (ต้นยี่หร่า) และ O. Tenuiflorum (ต้นกะเพรา)

Name: Rujira Suebsimma

LCSH: Basil

LCSH: Phytoremediation

LCSH: Metals -- Environmental aspects

LCSH: Soil amendments

LCSH: Zinc

Abstract: The objective of this study was to determine the suitability of the aromatic plants, Ocimum specie, as an alternative crop that could be grown in heavy metal contaminated soil. A hydroponic study was conducted to compare growth performance, Cd and Zn tolerance and accumulation by two aromatic crops, Ocimum tenuiflorum (holy basil) and O. gratissimum (African basil), grown in nutrient solution containing various concentrations of Cd and Zn (control, Cd 2.5 and 5 mg L-1 and Zn 10 and 20 mg L-1) for 15 days. The results showed that O. gratissimum had a higher tolerance (Tolerance index, TI > 1) and growth performance. O. gratissimum also accumulated higher Cd and Zn concentration in its tissues. As a result, O. gratissimum was selected for further study. A pot experiment was performed to examine the influence of hydroxyapatite (HA) (0.75%and 1.5 % w/w) and cow manure (10% and 20 % w/w) amendments on growth and Cd and Zn accumulation in O. gratissimum grown in contaminated soil for 3 months. Cow manure application showed the maximum dry biomass production of O. gratissimum and significantly reduced DTPA extractable Cd and Zn concentration in soils. Hydroxyapatite amendment did not improve growth of O. gratissimum but was effective in reducing the mobility of both Cd and Zn. Both HA and cow manure could reduce the Cd and Zn concentrations in both roots and shoots. Moreover, Cd concentration in leaves of O. gratissimum grown on soil amended with 20 % cow manure decreased to 0.29 mg kg-1, which slightly exceeded the maximum level (ML) for Cd set by the Commission of the European Communities and the Codex Alimentarius Commission (0.2 mg kg-1 DW for leafy vegetables and fresh herbs). Therefore, growing O. gratissimum in combination with soil amendments as an alternative cash crop on slightly heavy metal contaminated agricultural soils is economically and environmentally feasible.

Mahidol University

Address: NAKHON PATHOM

Email: liwww@mahidol.ac.th

Name: Maleeya Kruatrachue

Role: Thesis Advisors

Created: 2008

Modified: 2553-06-18

Issued: 2010-06-18

CallNumber: TH R934i 2008

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Environmental Biology

Grantor: Mahidol University

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