Clover Increased From 10% to 17% Across 10 Paddocks
Canterbury Pasture Case Study — New Zealand
After the nitrogen programme changed from conventional urea to Turbo N, average visually assessed clover content across the same 10 Canterbury paddocks increased from 10% to 17% over one year.
That's a 7 percentage-point increase, or a 70% relative increase in visually assessed clover content.
The Result at a Glance
Average Clover
10% → 17%
Paddocks Assessed
10
Period
1 Year
Observed Range
5–15% → 8–25%
Case Snapshot
Location: Canterbury, New Zealand
System: Pasture
Paddocks assessed: 10
Period: Approximately one year
Programme change: Conventional urea → Turbo N
Assessment: Visual clover percentage across the same paddocks
Other significant management changes: None known
The original field records are no longer held by DCT. Clover percentages were visually assessed rather than determined through botanical dry-matter separation.
The Starting Point
Clover is an important part of productive New Zealand pasture systems.
It provides high-quality feed and, through its relationship with rhizobia in root nodules, has the ability to fix atmospheric nitrogen.
But maintaining useful clover content alongside productive grasses can be challenging.
Grass and clover compete for light, water and nutrients, and nitrogen management can influence that balance.
On this Canterbury farm, the nitrogen programme changed from conventional urea to Turbo N.
The same 10 paddocks were then compared approximately one year later.
What Changed
The key programme change was straightforward:
Conventional urea → Turbo N
We are not aware of another major management change during the comparison period.
That doesn't mean DCT was necessarily the only variable affecting the pasture. Weather, grazing management, soil fertility, moisture, pests and seasonal conditions can all influence clover performance.
But it gives the case a clear point of comparison:
What happened to clover content during the year after the nitrogen programme changed?
The Result
Average Clover: 10% → 17%
Across the 10 paddocks, average visually assessed clover content increased from:
10%
to:
17%
over approximately one year.
That's an increase of:
7 percentage points
or a:
70% relative increase
The result wasn't confined to a single paddock.
The observed range across the 10 paddocks also shifted.
At the Beginning
5–15% clover
Approximately One Year Later
8–25% clover
The most useful way to describe the result is therefore the simplest:
Across the same 10 paddocks, average visually assessed clover increased from 10% to 17% in approximately one year.
Why More Clover Matters
Clover is more than another species in the pasture mix.
White clover can form a symbiotic relationship with rhizobia bacteria in root nodules, allowing atmospheric nitrogen to be converted into forms that enter the pasture nitrogen cycle.
That means productive clover can make a meaningful contribution to the nitrogen supply of a grazing system.
Clover can also contribute high-quality feed to mixed pasture.
So the commercial significance of increasing clover content isn't simply:
more clover.
The bigger question is whether a stronger clover component can contribute to a pasture system that makes better use of biological nitrogen fixation, purchased fertiliser and home-grown feed.
What About the Nitrogen Value?
The original DCT case converted the increase in clover into approximately:
49 kg N/ha
or:
106 kg urea/ha equivalent.
We no longer present that as a measured result from these paddocks.
The reason is important.
The amount of nitrogen fixed by clover depends on factors including clover dry-matter production, seasonal conditions, soil nitrogen, moisture, grazing management and the proportion of clover nitrogen derived from atmospheric fixation.
Clover percentage alone isn't enough to calculate precisely how much additional nitrogen was fixed.
What we can say confidently is:
Increasing productive clover increases the potential contribution of biologically fixed nitrogen to the pasture system.
The actual nitrogen contribution from these 10 paddocks wasn't measured.
Understanding the Result
DCT looks at pasture performance through several connected areas.
For this case, the two most relevant are:
Plant Performance and Nutrient Efficiency
Plant Performance
The result we actually observed was a change in pasture composition.
Average visually assessed clover increased from 10% to 17% across 10 paddocks.
That is the strongest evidence in the case.
The assessment method wasn't a laboratory botanical separation, so we don't claim greater precision than the visual measurements provide.
But because the same paddocks were compared over approximately one year, the shift provides useful commercial field evidence of how the clover component changed during the programme.
Nutrient Efficiency
This is where the result becomes particularly interesting.
Clover can contribute biologically fixed nitrogen to a pasture system, while fertiliser nitrogen can also influence the competitive balance between grass and clover.
The farm changed from conventional urea to Turbo N, and over the following year the average clover percentage increased substantially.
This case does not establish why.
We didn't measure:
nitrogen fixation rates;
rhizobia populations or nodulation;
nitrogen transfer from clover to grass;
changes in soil nitrogen cycling.
So we don't claim that Turbo N directly caused any particular biological mechanism.
What the case does give us is a useful commercial result:
The clover component increased substantially while nitrogen continued to be supplied through the farm's new Turbo N programme.
That makes the relationship between nitrogen management and clover performance worth investigating.
The Wider Pasture System
Clover performance never depends on nitrogen management alone.
Grazing pressure, competition from grass, soil fertility, moisture, temperature, pests and seasonal conditions can all influence how much clover persists in a pasture.
Root Development and Soil Function are important parts of DCT's wider framework, but neither was measured in this case.
We therefore don't use unmeasured changes in roots, soil structure or soil biology to explain the result.
The evidence here is much simpler:
The nitrogen programme changed.
The same 10 paddocks were followed.
Average visually assessed clover increased from 10% to 17%.
Why This Matters Commercially
Synthetic nitrogen can grow pasture.
Clover can contribute nitrogen biologically while also providing a high-quality component of the feed base.
That makes the balance between the two commercially important.
The question isn't necessarily:
Fertiliser nitrogen or clover?
A more useful question is:
How do we manage nitrogen while maintaining a productive clover component in the pasture?
On these 10 Canterbury paddocks, average clover increased substantially during the year after the nitrogen programme changed from conventional urea to Turbo N.
We don't know precisely how much additional nitrogen that clover fixed.
But a shift from:
10% → 17% average clover
is significant enough to matter when looking at pasture composition, biological nitrogen contribution and longer-term fertiliser efficiency.
What This Case Does — and Doesn't — Show
This is a commercial field case, not a replicated controlled trial.
Clover percentage was visually assessed across the same 10 paddocks approximately one year apart.
The original field records are no longer held by DCT, and we are not aware of other major management changes during the period.
The case does not demonstrate that Turbo N alone caused the increase in clover, nor does it establish changes in soil biology, root development, nodulation or nitrogen fixation rates.
What it does show is:
After the farm changed from conventional urea to Turbo N, average visually assessed clover across the same 10 Canterbury paddocks increased from 10% to 17% over approximately one year.
Better Farming Starts With Better Understanding
The value of clover isn't simply that there is more of it.
The opportunity is what a productive clover component can contribute to the wider farming system.
Pasture quality.
Biological nitrogen fixation.
Nutrient efficiency.
Home-grown feed.
Potentially less reliance on purchased nitrogen over time.
That's why DCT doesn't look at nitrogen application in isolation.
Could Your Nitrogen Programme Be Working Better With Your Clover?
If you're applying nitrogen but struggling to maintain clover, the first step is understanding what's happening in your pasture and why.
Talk to DCT about your current nitrogen programme, clover content and what you're seeing across the farm.
