2014 FLRC Workshop – Roberts & Watkins

One nutrient budget to rule them all – the overseer best practice data input standards.

Presenters: A. H. C. Roberts and Natalie Watkins.

As was demonstrated at this Conference last year for the Lincoln University dairy farm, user selection of the input parameters can have a major effect on the estimates of nutrient cycling for the described farm systems and hence the ultimate reported estimates for all outputs, including N losses and P loss risk. The purpose of providing OVERSEER® Best practice Data Input Standards (the Standards) is to reduce inconsistencies between different users when operating OVERSEER® to model individual farm systems. The Standards were not developed to teach users how to use OVERSEER®. For any one farm, the aim is to have one base nutrient budget which best describes the way nutrients cycle into, around and out of the farm.
The Standards were developed, at the request of the OVERSEER Owners, by a group of seven technical expert users, who drew on their personal knowledge and experience plus the DairyNZ Input Protocol, the AgResearch Expert User Group Guidelines and the Waikato Regional Council Protocol for Variation 5 (West Taupo catchment). The Standards are the consensus view of the seven technical expert users. A wider stakeholder advisory group, consisting of agricultural industry (dairy, sheep and beef, arable) representatives, regional councils, the Ministry for Primary Industries, the Ministry for the Environment and Irrigation New Zealand critiqued and endorsed the Standards.

Abstract:

As was demonstrated at this Conference last year for the Lincoln University dairy farm, user selection of the input parameters can have a major effect on the estimates of nutrient cycling for the described farm systems and hence the ultimate reported estimates for all outputs, including N losses and P loss risk. The purpose of providing OVERSEER® Best practice Data Input Standards (the Standards) is to reduce inconsistencies between different users when operating OVERSEER® to model individual farm systems. The Standards were not developed to teach users how to use OVERSEER®. For any one farm, the aim is to have one base nutrient budget which best describes the way nutrients cycle into, around and out of the farm.

The Standards were developed, at the request of the OVERSEER Owners, by a group of seven technical expert users, who drew on their personal knowledge and experience plus the DairyNZ Input Protocol, the AgResearch Expert User Group Guidelines and the Waikato Regional Council Protocol for Variation 5 (West Taupo catchment). The Standards are the consensus view of the seven technical expert users. A wider stakeholder advisory group, consisting of agricultural industry (dairy, sheep and beef, arable) representatives, regional councils, the Ministry for Primary Industries, the Ministry for the Environment and Irrigation New Zealand critiqued and endorsed the Standards.

Presentations from the Fertilizer and Lime Research Centre (Massey University) Workshop. The indicative information about this workshop is the ‘Proceedings’ accessed through the ‘Publications’ page on the website (http://flrc.massey.ac.nz/). These are the manuscripts provided by the authors, and it is these that must be cited when referring to the information presented at the workshop.