ISHS Acta Horticulturae 639: XXVI International Horticultural Congress: Expanding Roles for Horticulture in Improving Human Well-Being and Life Quality
PESTICIDE DISSIPATION IN THE GREENHOUSE ENVIRONMENT DURING HYDROPONIC CULTIVATION OF GERBERA |
| Authors: | S. Hatzilazarou, M. Charizopoulos, E. Papadopoulou-Mourkidou, A.S. Economou |
| Keywords: | chlorothalonil, methamidophos, airborne residues, residue analysis, workers safety |
| Abstract:
The concentrations of the pesticides methamidophos and chlorothalonil in the air of the greenhouse related to their physical and chemical properties and to their respective application rates. Methamidophos exhibited the highest concentration in the greenhouse air 2 hours after application (27.5 μg/m3), due to its high volatility, while afterwards, up to 12 hours post-application, a rapid decrease was recorded which finally led to a concentration level of 0.45 μg/m3 at 6 days post-application. Chlorothalonil exhibited the same trend of dissipation in the greenhouse air; its concentration from 4.9 μg/m3, right after the application, decreased to 0.15 μg/m3 at 6 days post-application. The concentrations of both pesticides in the drain water of the open hydroponic system were high right after the application and decreased rapidly during the following 3 days. In the closed hydroponic system both pesticides were accumulated in the nutrient medium during the first 24 hours after the applications and began to decrease slowly during the following 3 days. The spray operators during pesticide applications were exposed to higher concentrations of chlorothalonil than those of methamidophos. | |
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