Four-Year Trial Confirms Plantain Cuts N Losses 33%
A four year trial has reaffirmed that mixing plantain into dairy pastures can help reduce nitrogen losses to freshwater while maintaining milk production and profitability, say researchers.
“In my job, the main use is for consent applications, farm environment plans and year end budget updates,” she explains.
“There can be frustrations among farmers in trying to understand how the model works. My job is to demystify that and explain why their numbers may go up or down, when we make changes. If I can do that, it puts the farmer in control of the model and the outcome.”
Topham, who specialises in preparing farm nutrient budgets and farm systems, says ensuring the modelling and numbers are fed into the system correctly is also critical.
“Unfortunately, sometimes the information entered into Overseer doesn’t reflect the farm system 100%. This can lead to distrust in the system as farmers may get different outcomes from different sources; one might say their farm is compliant and another may not. A simple example of this is one modeller entering supplements as dry weight and another as wet weight.”
She emphasises that it is important to understand how the tool works and to input the information in the way that Overseer is asking for it.
“I always sit down with the farmer and go through everything. I come from a farming background and I understand farmers’ language and, if something doesn’t sound quite right, I’ll make sure I ask the right questions, so we input the right information.”
Topham formerly worked in event facilitation for DairyNZ. Then she did a stint as a farm systems consultant in the dairy industry before getting the opportunity to be mentored into nutrient budget, consent and compliance consulting.
“I loved it and didn’t look back. I have been doing that for four years and using Overseer professionally for about five years,” she explains. “I was first introduced to the tool about ten years ago, at university, where we used it for creating fertiliser plans as well as in other courses I took.”
Topham says the university work involved a cursory look at nitrogen leaching losses. “Now when I use Overseer, the loss numbers are what’s significant for me. For the consent applications, we are aiming to develop a robust future farm system that has a lower environmental impact than the current land use.”
She admits to not being the biggest fan of OverseerFM when it first came out but has come around to its benefits.
“I don’t like change and in my work perfection is the minimum standard. I was worried with the new version I might not notice a mistake. Now, however, I’m a big fan.”
