High volume applications, greenhouse

De Vreede, J.A.F., De Haan, M., Brouwer, D.H., van Hemmen, J.J., and de Kort, W.L.A.M. (1994) Exposure to Pesticides. Part III. High-Volume Application to Chry-santemums in Greenhouses, Report S131-4, Ministry of Social Affairs and Employment, The Hague, The Netherlands. 

The DFR values were followed over a period of 4 weeks from the high-volume application. The decrease of DFR in the two zones was monitored in six greenhouses (three times after application of thiophanate-methyl and three times after application of methiocarb). Figure 2 shows typical log-transformed decays of DFR (average of two samples for each zone) for methiocarb and thiophanate-methyl. Assuming a first-order decay, half-lives were calculated using Equations (3) and (4) and were found to be 29 8.5 days and 11 3.4 days for thiophanate-methyl and methiocarb, respectively. 

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