Phosphorus export at the paddock, farm-section, and whole farm scale on an irrigated dairy farm in south-eastern Australia

CSIRO Publishing - Tập 56 Số 1 - Trang 1 - 2005
Kirsten Barlow1,2, David Nash3, Rodger B. Grayson1
1CRC for Catchment Hydrology and the Department of Civil and Environmental Engineering, The University of Melbourne, Vic. 3010, Australia.
2Primary Industries Research Victoria (PIRVic), Department of Primary Industries, Rutherglen, RMB 1145, Chiltern Valley Road, Rutherglen, Vic. 3865, Australia.
3PIRVic, Department of Primary Industries, Ellinbank, RMB 2460, Hazeldean Road, Ellinbank, Vic. 3821, Australia.

Tóm tắt

Phosphorus (P) exported from agricultural land contributes to the eutrophication of inland water systems. Although P export has been extensively researched at the paddock scale, our understanding of farm-scale export is limited. This paper presents the results of a 3-year monitoring project that investigated P export at the paddock, farm-section, and whole farm scales on an irrigated dairy farm in south-eastern Australia. Annual average concentrations of 2.2–11 mg P/L, and annual loads of 2.5–23 kg P/ha were measured at the paddock and farm-section scale over the 3 years, with the quality of irrigation water applied having no significant effect on P export in surface runoff. At the farm scale, effective management of the water reuse system significantly reduced phosphorus export by up to 98%. During the 3-year period, P concentrations and loads exported in surface runoff consistently decreased between the paddock and farm-section scales (e.g. P-28 exported 13.8 kg P/ha, whereas S-4 exported 6.7 kg/ha in 2001), with the decrease in P export described using a scaling factor. Our results suggest that data on paddock-scale P export can rarely be proportionally assigned to predict section- or farm-scale export, at least on irrigated dairy farms in south-eastern Australia.

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Tập 56 Số 1

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