Effect of cadmium on growth of four new phyusic nut (Jathropa curcas Linn.) varieties
2008
Suppadit, T., National Inst. of Development Administration, Bangkapi, Bangkok 10240 (Thailand). The Graduate Program in Environmental Management, | Kitikoon, V. | Suwannachote, P., National Inst. of Development Administration, Bangkapi, Bangkok 10240 (Thailand). School of Social and Environmental Development
A trial was conducted from February 2007 to February 2008 to study the effect of cadmium (Cd), at levels of 0, 100, 200 and 300 mg/kg in soil by weight, on four new varieties of physic nut (Jathropa curcas Linn), namely Takfa, Doi Saket, Lao and Rayong. Plant growth, yield and Cd residue in the plants, as well as chemical characteristics, nutrients and Cd residue in the soil were monitored. Differences in yield potential, yield obtained, and Cd residue in the plant parts (P0.05) were not observed among the four varieties. However, the Cd soil residue at 100-300 mg/kg, caused a decrease in growth potential in all varieties, which was significantly different from untreated controls (P0.05). In addition to stunted growth, the plants did not produce any yield. Cd levels in all plant parts were higher than the standard in all varieties (0.100-2.00 mg/kg) for all treatments. Decreased nutrient utilization was observed in the treated plants. These physic nut varieties, therefore, cannot be grown as a renewable energy source in areas where Cd residue is present in soils at a level of 100 mg/kg and above.
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