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Modeling the Effects of Tillage Management Practices on Herbicide Runoff in Northern Italy

^a Istituto di Chimica Agraria ed Ambientale, Università Cattolica del Sacro Cuore, 29100 Piacenza, Italy
^b Dipartimento di Scienze e Tecnologie Agroambientali, Università di Bologna, 40126 Bologna, Italy

View larger version (22K): [in a new window]   Fig. 1. Map of the study site (northern Apennine, Italy, 44°28'N, 11°28'E)

View larger version (28K): [in a new window]   Fig. 2. Daily precipitation volume and maximum rainfall intensity during the simulated period (1 June–30 Sept. 1991 and 1 Jan.–31 Dec. 1992).

View larger version (35K): [in a new window]   Fig. 3. Observed vs. predicted event-based water runoff volume in 1991 and 1992. Bars are standard deviations.

View larger version (34K): [in a new window]   Fig. 4. Observed vs. predicted event-based sediment erosion in 1991 and 1992 with different IREG (location of the Natural Resources Conservation Service 24-h hyetograph) values.

View larger version (22K): [in a new window]   Fig. 5. Observed vs. predicted pesticide loss percentage via water runoff relative to their application rates in 1992. Bars are standard deviations.

View larger version (25K): [in a new window]   Fig. 6. Predicted metolachlor concentrations in eroded sediment in 1991 and 1992 with different Kd values.

View larger version (25K): [in a new window]   Fig. 7. Observed vs. predicted percentage of applied pesticides lost in eroded sediments in 1992. Bars are standard deviations.