Making every application count this spring
Words: Dr Elena Duter, Head of Agronomy, Farmlands
Spring 2026 is shaping up to be one of those seasons where the calendar and the weather don't agree. Long-range outlooks point to a shorter, sharper application window than farmers and contractors have had in recent years. Wet fronts bookend periods of good ground conditions, closing the gate on spreading almost as quickly as they open it. For large-scale operations running significant hectares through a single contracting business, that compression puts real pressure on scheduling, product choice and getting the right nutrient down in the narrow windows available.
It also changes the conversation contractors need to have with their clients. When there's less room to "wait for the next fine spell", the products going on the truck matter more than usual. A product that performs reliably regardless of exactly when the rain arrives is worth more to a farmer than one that only works if the timing lines up. That's where this spring's Ballance line-up earns its place on the shed shelf, particularly across nitrogen, sulphur and the two micronutrients most likely to be flagged on this season's soil and herbage tests: boron and molybdenum.
Nitrogen: SustaiN and the case for coated urea
Standard urea has always come with a timing catch. It needs rain or irrigation within a day or even hours to wash it into the soil, or a meaningful share of the nitrogen volatilises straight back into the atmosphere as ammonia. In a normal spring, contractors can plan around that. In a short, sharp spring, that buffer disappears and a poorly timed application can mean paying for nitrogen that never reaches the plant.
SustaiN, Ballance's urea coated with the AGROTAIN nitrogen stabiliser, is built for exactly this scenario. The coating slows the enzyme reaction that converts urea to ammonia, cutting volatilisation losses by around 50 percent compared with standard urea and, critically, removing the "must rain soon" constraint. It can be applied at any point in the window, rain or no rain, which is the single biggest operational advantage a contractor can offer a client this spring. For farms trying to fit N across multiple blocks in a compressed run of fine days, that flexibility is what keeps the whole programme on schedule rather than banking on the forecast holding.
SustaiN still carries the standard grazing withholding advice of three days on pasture. A timing detail worth flagging alongside the application, not just the product benefit.
It's worth explaining the mechanism to clients who ask why a coated product behaves so differently, because the chemistry is genuinely the reason this matters this spring. Standard urea granules dissolve on contact with soil moisture and soil urease enzyme immediately starts converting that dissolved urea to ammonium. Under dry, sunny or breezy surface conditions, a meaningful share of that ammonium can convert further to ammonia gas and volatilise straight off the paddock before it ever moves down into the root zone. Losses of 10–30 percent of applied N are well documented for surface-applied urea under poor incorporation conditions and they climb further the longer the ground stays dry after application. AGROTAIN works by temporarily blocking the urease enzyme itself (it's an NBPT-based urease inhibitor), which delays that conversion for roughly one to two weeks. That delay is the whole point: it buys enough time for a rain event or irrigation cycle to arrive and wash the still-intact urea down into the soil profile, where subsequent hydrolysis happens away from the surface and the ammonia produced is captured by soil moisture and clay/organic matter rather than lost to the air.
The practical implication for a short, sharp spring is straightforward: with standard urea, a contractor is effectively betting the application on the next rain arriving within a day or two of spreading. If they get the timing wrong, a real portion of the nitrogen spend is gone before it does anything. With SustaiN, that bet is removed. The product can sit on the ground through a longer dry spell without the same loss curve, meaning a contractor can spread to fit the machinery and paddock schedule rather than the forecast and the nitrogen is still there and available whenever the rain does eventually arrive or the irrigation is scheduled. In a season where fine-weather windows may be scattered and unpredictable, that's the difference between one confident pass and a programme built around hoping the timing lines up.
Sulphur: closing the gap before it shows up in growth rates
Sulphur is the nutrient that gets overlooked until it's already cost the farmer growth. Spring pasture and crop demand for sulphate-sulphur ramps up fast once soil temperatures lift. In many New Zealand soils and particularly those with a history of leaching over winter, that readily available pool is already thin by the time spring growth kicks off. A short spring dictates that there's less time for a slow-release product to catch up if it's applied late.
Ballance's Sulphurgain range is built to cover both ends of that problem in one pass. The blends combine sulphate sulphur, which is immediately plant-available, with fine elemental sulphur, which breaks down over time to extend supply throughout the season and give farmers insurance on their reserves. For contractors advising clients on timing, this dual-release structure is a point worth making. A single well-timed Sulphurgain application can cover both the immediate spring flush and the follow-through, reducing the number of passes needed if the weather window closes again before a second application can be scheduled. On hill country and larger contour blocks where return visits are harder to guarantee, it’s a genuine efficiency argument, not just a nutrition one.
Boron: a micronutrient that does not get along with guesses
Boron deficiency is easy to miss on a standard soil test and the impact is easy to underestimate. For brassicas, legumes and some fruiting crops, it's directly tied to the quality of new tissue formation and, in brassica bulb crops, storage quality later in the season. Because boron has a genuinely narrow band between deficient and excessive, it isn't a nutrient to guess on; a soil or herbage test result should be driving the decision, not a routine top-up.
Ballance's Boron products (Pure Boron 10% and NutriMax Boron 15%) are formulated for straightforward blending into a wider fertiliser programme rather than requiring a standalone pass, which matters when contractors are trying to minimise the number of trips across a paddock in a tight window. For farms with brassica going in this spring, boron correction is best timed early. New tissue formation is when the crop needs it most and catching that window before growth accelerates is far more effective than trying to correct a visible deficiency afterwards. In fact, in most cases when it has been missed or not applied in enough quantities, the damage is already done.
Molybdenum: small quantities, big effect on legumes
Molybdenum is needed in genuinely tiny amounts, but its role is disproportionate: it's essential to the nitrogen-fixing capacity of legumes, meaning a molybdenum-deficient mixed sward containing clovers can be quietly under-producing its own nitrogen supply all season without an obvious visual symptom. On acidic soils in particular, where molybdenum availability drops as pH falls, it is worth flagging to clients who are already planning a liming programme, since correcting pH and correcting molybdenum often go hand in hand. For clients who aren’t able to apply lime, molybdenum can be applied.
Ballance's NutriMax Molybdenum 1% is designed to be blended in at low rates alongside a standard spring application, making it a low-friction addition for contractors already running a mixed load. Given how small the quantities involved are, this is also a product where accurate blending and even spread matter more than usual. It is worth a word to clients about spreader calibration on these lighter, trace-element-inclusive blends specifically, since under- or over-application is easier to happen upon than with a straight bulk urea run.
The application edge this season
With a shorter window forecast, operational advice matters as much as the product choice: prioritise flexible-timing products like SustaiN where rain can't be guaranteed, bundle sulphur and micronutrient corrections into as few passes as possible using dual-release and blend-friendly products and keep spreader calibration front of mind on any load carrying trace elements. For large-scale farmers depending on a contractor to get the whole property covered before the next front rolls in, the combination of soil testing to inform decision making, the right Ballance product and a tight operational plan is what turns a compressed spring into a manageable one.