Author(s)

Takamitsu Kai¹, Hiromi Ikeura², Ariaki Ayanokoji³, Masahiko Tamaki^1*

¹Kurokawa Field Science Center, Meiji University, Kawasaki, Japan.
²Life and Environmental Sciences Department, Shimane University, Matsue, Japan.
³School of Agriculture, Meiji University, Kawasaki, Japan.

In this study, we compared plant height, weight, soil TPH concentration, and soil DHA level after 18 weeks of Zennia hybrida cultivation with four different concentrations of 5-Aminolevulinic acid (ALA)-based liquid fertilizer: 1500-fold, 5000-fold, and 8000-fold dilutions, along with a non-treatment control of diluted ALA. The plants of ALA-treated were significantly taller than the non-treatment control. The plants of ALA-treated plants were higher in shoot fresh weight, shoot dry weight, and root dry weight than the non-treatment control. The plot of ALA-based liquid fertilizer with the 5000-fold dilution was significantly highest in shoot fresh weight, shoot dry weight, and root dry weight. ALA-treated plants were lower in the soil Total Petroleum Hydrocarbon (TPH) concentration than the non-treatment control. The plot of ALA-based liquid fertilizer with the 5000-fold was significantly lowest in the TPH concentration. In addition, ALA-treated plants were higher in the soil dehydrogenase activity (DHA) than the non-treatment control. The plot of ALA-based liquid fertilizer with the 5000-fold was significantly highest in the TPH concentration. This study indicated that ALA-applied zinnia-grown oil-contaminated soil is more effective than not. The remediation in oil-contaminated soil with ALA-based liquid fertilizer is more effective than the non-treatment control; furthermore, ALA application with 5000-fold dilution was most suitable in oil-contaminated soil among other plots.

Phytoremediation, Zinnia, 5-Aminolevulinic Acid, Soil Total Petroleum Hydrocarbon (TPH) Concentration, Soil Dehydrogenase Activity (DHA)

Kai, T. , Ikeura, H. , Ayanokoji, A. and Tamaki, M. (2020) Effects of 5-Aminolevulinic Acid (ALA) on Zinnia hybrida Growth and Phytoremediation Effects in Oil-Contaminated Soil. Journal of Agricultural Chemistry and Environment, 9, 97-106. doi: 10.4236/jacen.2020.93009.