Fertilizer Dose Calculator
Converts a recommended nitrogen dose into the urea a field needs, then shows how many bags that urea weighs out to.
Recent
Formula
How the calculation works
Urea is about 46 percent nitrogen by weight, so the recommended nitrogen is divided by 0.46 to find the actual urea the crop needs.
The recommended nitrogen per acre is first multiplied by the number of acres, giving the total nitrogen for the whole plot.
Dividing the urea weight by the bag size gives the number of bags, so 130.4 kg of urea works out to about 2.61 bags of 50 kg.
Common mistakes
- Using the urea weight directly as the nitrogen dose applies only half the nutrient the crop needs, so always divide by 0.46.
- Rounding the bag count down to whole bags leaves the field short, because the last part bag is usually needed to hit the recommended dose.
When to use it
- Use it at planting time to buy the right number of urea bags instead of guessing from the field size alone.
- Use it to compare the urea needed for different plot sizes before you place a fertiliser order with the dealer.
Worked example
A recommendation of 60 kg nitrogen per acre on 1 acre needs about 130.4 kg of urea, which is roughly 2.61 bags of 50 kg.
Common questions
Why is urea divided by 0.46?
Urea contains about 46 percent nitrogen, so dividing the required nitrogen by 0.46 gives the equivalent weight of urea the soil actually needs.
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