We’ve put together a summary of useful research, reports, presentations and agreements related to farming in the Lake Rotorua catchment:
The Collective AGM has held on Tuesday 2nd May 2017. Read and download the AGM Reports and minutes below:
Here you’ll find links to a selection of farm nutrient research, presentations and reports. The Collective doesn’t endorse these reports but we think they give some useful technical background to the current nutrient policy and the potential solutions.
Find out about nitrogen and phosphorus losses from Rotorua farms, ways of reducing those losses and the impact on profit.
|BOPRC Draft Response to Collective on 'Farmer Science Priorities'||BOPRC & its Advisors||A response to questions asked by the Collective in Nov 2015. The questions covered land science, Overseer, phosphorus, lake science & policy.||2016|
Final Report: Meeting nutrient loss targets on dairy farms in the Lake Rotorua catchment
|Tanira Kingi, Sharon Morrell, Lee Matheson, Mike Sprosen, Stewart Ledgard and Simon Park||This is the final report from the Rotorua dairy SFF project, including the Parekarangi field trials||2015|
The context and practice of nutrient mitigation on Rotorua dairy farms
|Simon Park, Tanira Kingi, Sharon Morrell, Lee Matheson, Mike Sprosen and Stewart Ledgard||This paper gives field trial and nitrogen modelling results from the Collective's SFF Project||2015|
|Meeting nutrient loss targets on dairy farms in the Lake Rotorua catchment: Interim report on results from the Parekarangi Trust farm||Mike Sprosen and Stewart Ledgard (AgResearch)||Interim field trial results on how different nitrogen fertiliser rates affect pasture growth, pasture quality and nitrate leaching.||2014|
|Evolving to nitrogen discharge allocations for the Lake Rotorua catchment||Warren Webber and Gwyn Morgan||An explanation of the targets and Stakeholder Advisory Group thinking behind the draft nitrogen allocation scheme.||2014|
|Nitrogen losses from Lake Rotorua dairy farms - modelling, measuring and engagement||Simon Park, Tanira Kingi, Sharon Morrell, Lee Matheson and Stewart Ledgard||2014: Progress results from the Collective’s Sustainable Farming Fund dairy farm nitrogen project.||2014|
|Rotorua NDA Impact Analysis||Perrin Ag Consultants Ltd||The on-farm profit impacts from draft NDA levels are modelled for a range of dairy and drystock farms.||2014|
|Solutions for a sustainable Lake Rotorua: the farmers’ perspective||Tanira Kingi, Simon Park and Mike Scarsbrook||The story behind the Collective’s formation and its preferred solutions such as improved on-farm management.||2012|
|Farmer Solutions Project||Perrin Ag Consultants Ltd||A survey of farmer nitrogen mitigation preferences, associated costs and the overall economic impact on the catchment.||2012|
|Rotorua benchmarking: challenges and progress||Simon Park and Penny MacCormick||An explanation of Rule 11 nutrient benchmarking with some interim N and P loss results from 2011.||2011|
|The efficacy of strategies to mitigate the loss of phosphorus from pastoral land use in the catchment of Lake Rotorua||Richard McDowell (AgResearch)||Various phosphorus mitigations methods are ranked according to effectiveness and cost.||2010|
|Practical mitigation options to reduce|
nitrogen and phosphorus losses from farms
into Rotorua lakes
|Stewart Ledgard, Mike Sprosen, Matt Redding, Anwar Ghani, Duncan|
Smeaton, and Rex Webby
|This report summarises the research from the SFF funded project |
through to 30 June 2007.
Here you’ll find links to selection of lake research and reports. The Collective doesn’t endorse these reports but we think they give some useful technical background to the current nutrient policy and the potential solutions.
|Report Title (link)||Author(s)||Summary||Date|
|Lakes Research Presentations||Dr David Hamilton, Dr Grant Tempero & Hannah Mueller||Presentations delivered at a public meeting on 17 November 2015||2015|
|Assessing the effects of alum dosing of two inflows to Lake Rotorua against external nutrient load reductions:Model simulations for 2001-2012||Dr David Hamilton||Effects of Alum Dosing on Lake Rotorua Water Quality||2015|
|Phosphorus controls improve Rotorua water||Dr Mike Scarsbrook||Dr Scarsbrook summarises the research undertaken by the university of Waikato - "Assessing the effects of alum dosing of|
two inflows to Lake Rotorua against
external nutrient load reductions:
Model simulations for 2001-2012"
|Monitoring and modelling to support management and policies for Lake Rotorua||David Hamilton and Chris McBride (University of Waikato)||A lake science presentation by Waikato University at Ngongotaha Hall in December 2013, including responses to farmer questions.||2013|
|Trends and state of nutrients in |
Lake Rotorua streams 2013
|Paul Scholes, BOPRC||Nitrogen and phosphorus trends since 1992 are summarised for nine Lake Rotorua streams.||2013|
|Use of a model to predict the effects of land use changes on nitrogen delivery to Lake Rotorua, especially the lags involved with groundwater||Chris Palliser, Kit Rutherford and Sanjay Wadhwa (NIWA)||The main results from NIWA’s ROTAN model, reduced to 11 pages.||2011|
|Prediction of nitrogen loads to Lake Rotorua using the ROTAN model||Kit Rutherford, Chris Palliser and Sanjay Wadhwa (NIWA)||The full ROTAN report covers status quo and possible future land use scenarios and the resulting nitrogen loads on Lake Rotorua (183 pages, 9MB file)||2011|
How is TLI calculated? The TLI number is calculated using four separate water quality measurements:
Total nitrogen and total phosphorous are nutrients that plants thrive on. Large amounts of these nutrients in the lakes encourage the growth of algae which can lead to poor water quality. Water clarity is a measurement of how clear the water in the lake is. In general, the clearer the water, the better the water quality. Chlorophyll-a is the green colour in plants. Knowing how much chlorophyll there is in a lake gives us a good idea of how much algae the lake has. The more algae present, the poorer the water quality. The Trophic Level Index combines these four measurements into one number.
|Lake||Water Quality Target||2015/ 2016 Result||2014/ 2015 Result||2013/ 2014 Result||2012/ 2013 Result||Stability|
|Rotoma||2.3||2.4||2.5||2.38||2.36||To be investigated|
|Tikitapu (Blue Lake)||2.7||2.9||2.9||2.82||2.75||Stable|
|Rotoiti||3.5||3.8||3.8||3.40||3.44||To be investigated|
|Rotokakahi||3.1||3.7||4.0||3.63||3.69||To be investigated|