ISHS Acta Horticulturae 372: Symposium on Engineering as a Tool to reduce Pesticide Consumption and Operator Hazards in Horticulture
MANAGEMENT OF EMISSION FLOWS OF PESTICIDES FROM GLASSHOUSES |
| Authors: | E.A. van Os, H.J. Holterman, G. Klomp |
| Keywords: | crop protection, closed business systems, substrates, dichlorvos, parathion |
| Abstract:
Management of the pesticide flow out of glasshouses means the prevention of emissions to soil, surface and ground water and air. Results are presented of investigations to reduce emissions of pesticides to the soil or to ground or surface water using closed soilless growing systems and to the air by closing the glasshouse and purification of the air. The introduction of soilless cultures (substrates) made it possible to reduce the emission to soil and water and to reduce consumption of pesticides. Soil sterilization by chemicals became superfluous. Disinfection of substrates can be realized by steaming. As a consequence of some growing systems the use of chemicals against soil pathogens can be reduced even more. To reduce emission to the air after a space treatment a feasibility study has been made to examine if purifying of the air by carbon filters is worthwhile and how it should be executed after application of chemicals. Emission from glasshouses highly depends on the volatility of a pesticide and the natural air exchange of the glasshouse. From a closed glasshouse (ventilation rate 0.5 h-1) 25–50% of the applied pesticide emits. In total 5–20% of the applied pesticide emits during application. Extraction of the air immediately after application reduces sedimentation fairly but emission only slightly. | |
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