Pressmud Compost & Nutrients & Bags Replaced
Replaces urea
“Ask in public — the answer helps everyone who lands here after you.
Enter how much pressmud you apply to get the N, P₂O₅ and K₂O it supplies and the urea, SSP and MOP bags it replaces — so you can cut your fertiliser bill.
Pressmud compost value
Next: credit roughly 326 kg urea, 1,875 kg SSP and 167 kg MOP against your fertiliser plan when you apply this compost.
Pressmud (sugar-mill filter cake) is rich in P and organic matter; actual nutrient release is gradual over the season, so treat this as a slow-release credit, not a like-for-like substitute.
Pressmud — key facts
- Source
- sugar-mill filter cake
- Nitrogen
- ≈ 1.5% N
- Phosphorus
- ≈ 3% P₂O₅
- Potash
- ≈ 1% K₂O
- Plus
- organic matter & micronutrients
- Apply
- incorporate before sowing
- Replaces
- urea, SSP, MOP bags
- Privacy
- Runs in your browser; nothing uploaded
Turn a mill by-product into real fertiliser savings
Pressmud is one of farming's best-value organic manures: a sugar-mill by-product that's often cheap or free near cane belts, yet carries a useful load of nitrogen, phosphorus and potash along with organic matter and micronutrients. Applied and incorporated before sowing, it feeds the crop and steadily builds soil structure, water-holding capacity and microbial life — benefits a bag of straight fertiliser can't match.
This tool gives the nitrogen, phosphorus and potash supplied by the pressmud you apply and the urea, SSP and MOP bags it replaces, so you can credit the manure against your fertiliser plan and buy only what's left to fill the gap. Pair it with the FYM Fertilizer Equivalent, Compost & Manure and Crop Residue Nutrient tools to value every organic input on the farm.
Cut the fertiliser bill
Credit pressmud nutrients against bagged inputs.
Value a cheap manure
See the NPK in a low-cost mill by-product.
Build soil health
Add organic matter and micronutrients too.
Plan the top-up
Buy only the fertiliser left to fill the gap.
Frequently Asked Questions
What is pressmud?+
Pressmud — also called filter cake or press mud — is the spongy residue left when sugarcane juice is clarified at the sugar mill. It's a cheap, nutrient-rich organic manure that carries nitrogen, phosphorus, potassium, organic matter and a range of micronutrients, making it a valuable soil amendment for nearby farms.
How much NPK does pressmud supply?+
As a guide, pressmud holds roughly 1.5% nitrogen, 3% phosphorus as P₂O₅ and 1% potash as K₂O, plus organic matter and micronutrients. This calculator multiplies those percentages by the quantity you apply to give the kilograms of N, P₂O₅ and K₂O the pressmud delivers to the soil.
How does it replace fertiliser bags?+
It converts the nutrients supplied into the equivalent straight fertilisers: nitrogen into urea (46% N), phosphorus into single super phosphate (16% P₂O₅) and potash into muriate of potash (60% K₂O). The result is how many bags of each you can hold back, trimming your fertiliser bill.
When should pressmud be applied?+
Apply and incorporate pressmud into the soil before sowing or planting, ideally a few weeks ahead so it can break down. Spreading it during land preparation and mixing it into the topsoil lets the nutrients become available to the crop and lets the organic matter start improving soil structure.
How much pressmud per acre is used?+
Rates commonly run from a few tonnes up to around 10 tonnes per acre depending on availability and the crop, with sugarcane and other heavy feeders taking more. Use this tool with your own application rate to see the nutrients delivered, then top up with mineral fertiliser to meet the crop's full requirement.
Besides NPK, what does pressmud add?+
Pressmud adds organic matter that improves soil structure, water-holding capacity and microbial life, plus micronutrients such as calcium, sulphur, iron, zinc and manganese. Over repeated use it builds soil health in a way bagged fertiliser alone cannot, which is its real long-term value.
Is raw pressmud safe to apply?+
Fresh pressmud is best composted or at least incorporated and allowed to break down before the crop's roots are active, as raw material can heat up and tie up nitrogen briefly as it decomposes. Composting first, or applying ahead of sowing, avoids any check to the young crop.
Does this work for any quantity or area?+
Yes — enter the total quantity of pressmud you're applying and the tool returns the nutrients supplied and fertiliser equivalents for that amount. The nutrient percentages are typical averages, so for precise planning have a sample of your pressmud tested, since composition varies by mill.
Are the figures precise?+
They're solid planning figures based on typical pressmud composition. Actual nutrient content varies with the mill, the cane and how the pressmud was processed and stored, and not all of it becomes available in the first season. Treat the results as a guide and confirm with a lab test where it matters.
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