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• W2122733020 abstract "Dairy cattle are significant contributors to the nutrient enrichment of New Zealand’s aquatic environment. However, there have been very few field studies that quantify the accelerated loss of nutrients that occurs when grazing coincides with or is immediately followed by drainage and/or surface runoff. More detailed information is required on the environmental risk associated with cows grazing at times when rainfall is likely to generate drainage and surface runoff. Nitrogen loss occurring in drainage and surface runoff immediately after grazing was quantified at a research site established on an artificially drained, finetextured soil, at Massey University’s No. 4 Dairy Farm in the Manawatu. The direct effect of an early winter grazing, which was immediately followed by a drainage event, on total N concentrations of drainage water was evident only during the first ~3 mm of a single drainage event. During this drainage episode there was a large initial increase in total N concentration of drainage water (~ 20 mg N litre -1 ), which quickly decreased to values comparable to drainage water from plots that had been grazed 7 days prior to the drainage occurring. The greater initial total N concentration from the freshly grazed plots was attributable to greater initial concentrations of both total organic-N and ammonium-N. Although the total quantity of N lost in this single drainage event was similar for both treatments, being ~ 4 kg N ha -1 , the forms of N lost differed. From the freshly grazed plots, the nonnitrate forms of N (total organic-N and ammonium-N) were ~ 0.5 kg N ha -1 greater, and were likely to be associated with the direct drainage or preferential flow of cattle urine. This loss attributed to direct leaching of urine-N is relatively small compared to the total annual quantities of N typically lost from dairy pastures in drainage (25-30 kg N ha -1 yr -1 )." @default.
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• W2122733020 date "2004-01-01" @default.
• W2122733020 modified "2023-09-25" @default.
• W2122733020 title "Nitrogen losses in artificial drainage and surface runoff from pasture following grazing by dairy cattle" @default.
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