Water rate is not the chemical dose.
Australian crop-protection labels can state a product rate, a carrier-water volume, a final spray volume, or more than one of these at once. They answer different questions. BecSpec keeps them separate so a hydraulic instruction is never mistaken for a chemical dose.
The short version
Product rate tells you how much registered product is used. Carrier water is the water component used to carry that product. Applied spray volume is the final liquid mixture physically discharged. They are not interchangeable.
Why the distinction matters
A label may say, for example, to use a minimum number of litres of water per hectare. That does not tell you to apply that many litres of herbicide per hectare. Conversely, a product dose in mL/ha or L/ha does not tell you the hydraulic volume the boom, aircraft or other equipment must deliver.
BecSpec therefore does not turn every number followed by “L/ha” into the same field. The surrounding label wording has to establish what the number represents before it can become machine-readable application guidance.
The three fields BecSpec keeps apart
| Field | Meaning | Typical use |
|---|---|---|
| Product rate | Quantity of the registered chemical product applied on the label basis. | Dose selection. Not a nozzle-flow input by itself. |
| Carrier water | Explicit water component used to carry the product. | Can become a sprayer hydraulic input where the label clearly states a water volume. |
| Applied spray volume | Final liquid spray mixture physically discharged. | A hydraulic input where the label states the total spray-solution volume. |
Why context can change the water rate
Application volume is sometimes conditional. Crop canopy, weed density, terrain, temperature, application method, tank-mix partner or another label condition can change the applicable value. When that happens, BecSpec does not publish one “general” number and bury the exception in prose. The condition has to be represented structurally, or that rule stays unpublished.
A concrete example is Sabakem Moxypyr Herbicide: reviewed ground-boom uses have a 70 L/ha minimum in the standard coverage condition and a 100 L/ha minimum when the crop is very leafy or total weed density exceeds 200 plants/m². The context is part of the rule, not a footnote.
Aerial and ground instructions are not inherited
An aerial water-volume instruction does not automatically apply to a ground-boom use, and product-level wording that mentions aircraft does not automatically authorise aircraft for every registered use. BecSpec attaches an application rule only when the current product, exact PubCRIS use, method and any controlling context can be joined safely.
See the reviewed hilly-terrain aerial examples for Golden Farmstead Glyphosate 450 Herbicide and GENFARM PANZER 540 K Herbicide. Also see the opposite case: Sabakem Saflufenacil 700 WG Herbicide, whose current label carries a product-global prohibition on aircraft application.
Recommended is not the same as mandatory
BecSpec also preserves whether a value is a hard label constraint or a recommendation. “Use at least 100 L/ha” and “100 L/ha is recommended” should not become the same machine rule. Where the wording does not justify a mandatory minimum or maximum, the tool does not promote it into one.
What to do before spraying
Use BecSpec as a structured reading aid, not as a replacement for the current registered label. Confirm the product, exact use, application method, dose, water or spray volume, droplet requirement, buffers, weather limits and any other conditions on the current APVMA label. Then calibrate and check the actual equipment output.
Evidence status
The application examples linked from this page were checked against current APVMA product/use identity and first-party label evidence on 28 August 2026. BecSpec deliberately leaves unresolved or context-dependent instructions unpublished rather than filling gaps by inference.
Open the Crop Protection finder → · Open the Spray Nozzle finder → · Read the matching method →