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Volume 36 Number 3 Volume 36 Number 4 Volume 37 Number 1

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ScienceAsia 36 (2010): 349-354 |doi: 10.2306/scienceasia1513-1874.2010.36.349

Immobilization of cadmium in soil by cow manure and silicate fertilizer, and reduced accumulation of cadmium in sweet basil (Ocimum basilicum)

Narupot Putwattanaa, Maleeya Kruatrachueb,*, Prayad Pokethitiyooka, Ratanawat Chaiyaratc

ABSTRACT:     This study was conducted to determine the effects of organic and inorganic soil additives in reducing Cd concentration in the edible parts of plants. A pot study was performed by growing Ocimum basilicum (sweet basil) in Cd contaminated soil (20 mg/kg Cd) and soils amended with cow manure and silicate fertilizer for 3 months. The results showed an increase in dry biomass production by factors of 4.7 and 1.7 in plants grown in soil supplemented with cow manure (20% w/w) and silicate fertilizer (20% w/w), respectively. Shoot Cd accumulation doubled in plants grown in cow manure treated soil. In contrast, the silicate fertilizer resulted in a 3-fold decrease in leaf Cd accumulation. The results of this investigation demonstrated the potential of silicate fertilizer in reducing Cd transport from roots to shoots, resulting in decreased Cd concentration in the edible parts of plants.

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a Department of Biology, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
b Department of Biology, and Mahidol University International College, Mahidol University, Bangkok 10400, Thailand
c Faculty of Environment and Resource Studies, Mahidol University, Salaya, Nakorn Pathom 73170, Thailand

* Corresponding author, E-mail: scmkt@mahidol.ac.th

Received 25 May 2010, Accepted 6 Oct 2010