Potential Phosphorus And Sediment Loads From Sources Within A Dairy Farmed Catchment

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Waituna Sediment Fingerprinting Study

sediment sources in an intensively farmed dairy catchment. In this case, stream banks were found to be a major source of sediment and associated P in winter and spring while topsoil sources dominated summer and autumn inputs. Riparian protection measures and decreasing Olsen P (OP) to nearer optimum agronomic levels were

Mangatarere Stream catchment water quality investigation

contaminant sources. Addressing these objectives involved a combination of a 13-month catchment investigation and a review of Greater Wellington s long-term State of the Environment (SoE) surface water and groundwater monitoring data as well as monitoring information for selected resource consents exercised within the Mangatarere catchment.

Water quality of a stream recently fenced-off from deer

McDowell Water quality of a stream 293 Fig. 1 location and topographical data of the study site within the Invermay catchments. Data for E. coli and SS required log 10 transformation before

2 of turbidity and discharge

58 Phosphorus (P) concentrations in streams and rivers present a high temporal variability that can 59 only be captured through sub-daily or even sub-hourly sampling [Cassidy and Jordan, 2011]. For example, P concentrations can vary by several orders of magnitude within a few hours60 61 during storm events in small rural and flashy catchments

Assessing the effectiveness of on-farm mitigation actions

On sheep and beef farmed land, 30% more sediment would have entered rivers between 1995 and 2015 if farmers hadn t changed their practices. Researchers estimated that if all known and developing mitigation actions were implemented by all dairy and sheep and beef farmers by 2035, potential loads of nitrogen and phosphorus entering

A review of nitrogen and phosphorus export to waterways

catchment models used by catchment managers are reviewed, and factors limiting their application are addressed. The review highlights the importance of dissolved N and P for overland flow and groundwater pathways, for sheep, beef and dairy grazing land use. Consequently, the effectiveness of riparian buffers to remove N and P may not be adequate.

Agriculture, Ecosystems and Environment

Modelling of P concentrations in one dairy-farmed sub-catchment suggested that up to 58% of P losses came from point sources, like bad effluent practice and stock access to streams. A statistical test to detect contaminated drainage was developed from historical data. If this test had been applied to remove

Lincoln University Digital

Chapter 2 - Investigations of critical source areas of phosphorus and sediment in a dairy pasture catchment 23 2.2 Introduction 23 2.2.1 Experiment aims 24 2.2.2 Site description 24 2.3 Potential phosphorus and sediment loads from sources within a dairy farmed catchment 25 2.3.1 Materials and methods 25 2.3.2 Results and discussion 27 2.4

Nonlinear empirical modeling to estimate phosphorus exports

Mellander et al., 2015, 2016]. Catchment sizes vary from 5 to 12 km2 and average rainfall ranges from 862 to 1060 mm yr21. Differences exist among the study catchments with respect to land use and soil types. Three catchments with intensive dairy farming are dominated by grasslands, covering 77, 77, and 60% of the total surface

Water quality of a stream recently fenced‐off from deer

farmed) lowland streams. Furthermore, P loads, sediment andE. coli were close to or exceeded the greatest loads thus far measured for New Zealand catchments in pastoral agriculture. However, the presence of deer and wallowing accounted for the majority of contaminants (about 60% of N, 80% of P, 60% of E. coli and up to 90% of sediment) found

An Approach To Assess And Manage Nutrient Loads In Two

estimate nitrogen (N), phosphorus (P) and sediment event-based loads in the Moruya and Tuross River catchments of the New South Wales south coast. The research programme is designed within the context of an integrated catchment modelling framework (CatchMODS), to assess relative contributions from diffuse sources of nutrient and sediment

MANAGING E OSYSTEM SERVI ES Prevent livestock such as cattle

Livestock farming on heavy clay soils can lead to total Phosphorus loads of up to 2 kg ha-1year-1, though the extent to which this is dependent on access of livestock to the river bank is unclear. A model which was validated on a Scottish dairy farm found that

Cattle access impacts on streams in agricultural catchments

nutrient, sediment and bacteria loads) impacts. The purpose of this study was to assess the effects of cattle access, by comparing upstream and downstream locations, on sediment levels

RESEARCH ARTICLE Sources of phosphorus in two subcatchments

Dissolved phosphorus (P) from various sources contributes to periphyton growth in rivers. The Manawatu catchment is in the southern North Island, and since it flows through pastoral farmland with soft rock geology, it carries nitrogen, P and sediment that lead to growth of periphyton.


2.2 The loss of phosphorus (P) from land to water can be viewed within the critical source area concept (CSA) which dictates that most catchment of farm scale P losses come from where there is a high potential P source coupled with a transport mechanism to waterways. Targeting strategies to mitigate P loss from