Sulphurous fertiliser
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| Sulphurous fertiliser | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | |||||||||||||||||||
| Released | 7 January 2016 (Update) | ||||||||||||||||||
| Members | Yes | ||||||||||||||||||
| Quest item | No | ||||||||||||||||||
| Properties | |||||||||||||||||||
| Tradeable | No | ||||||||||||||||||
| Equipable | No | ||||||||||||||||||
| Stackable | No | ||||||||||||||||||
| Noteable | No | ||||||||||||||||||
| Options | Empty, Drop | ||||||||||||||||||
| Examine | Used in the farming industry of Hosidius. | ||||||||||||||||||
| Values | |||||||||||||||||||
| Value | 48 coins | ||||||||||||||||||
| Alchemy | Not alchemisable | ||||||||||||||||||
| Weight | 3.05 kg | ||||||||||||||||||
| Advanced data | |||||||||||||||||||
| Item ID | 13419 | ||||||||||||||||||
| Link | MOID | ||||||||||||||||||
Sulphurous fertiliser can be made at level 36 Farming by combining saltpetre with regular compost. It can be used on grape vines in the Vinery to increase the yield of grapes and Zamorak's grapes by 20%.
Sulphurous fertiliser was originally used in the Kourend Favour system, where players could hand it into the Clerk in the centre of the saltpetre mine at a rate of 0.1% Hosidius favour per bucket.
Creation
| Item | Quantity | Cost | |
|---|---|---|---|
 | Compost | 1 | 12 |
 | Saltpetre | 1 | 5 |
| Total cost | 17 | ||
 | Sulphurous fertiliser | 1 | N/A |
- ^ Auto-creating is 1, then 3, then 4 ticks.
With an inventory of 14 buckets of compost and 14 saltpetre, using one with another will automatically start the process of combining them all into fertiliser - though the automatic combining slows to once every four game ticks. The process can be sped up considerably by manually using all of the compost and saltpetre with each other, which can be done once per tick - however this is dependent on click accuracy, and it can be quite difficult to distinguish the buckets of compost from the completed buckets of fertiliser.
In your bank, if you set your withdraw quantity to "X", and set "X" to a quantity of 4, you can withdraw 4 saltpetre, followed by 4 compost. Repeat this 3 times and it will arrange the compost and saltpetre in your inventory for effective manual creation of the sulphurous fertiliser.
Changes
| Date | Changes |
|---|---|
| 3 June 2026 (Update | poll) |
The item was re-added to the game, with its functionality changed to now increase the yield of grapes/Zamorak's grapes from grape vines by 20%. |
| 10 January 2024 (Update) |
With the removal of Kourend Favour, the item was converted to supercompost. |
| 10 January 2019 (Update) |
The examine text was slightly modified, the old examine text was "Used in the farming industry of Kourend." |
| 19 April 2018 (Update) |
The favour bonus for completing the quest Client of Kourend was removed, the base favour gained from donating buckets was increased to 0.1% per bucket. |
| 20 April 2017 (Update) |
The amount of favour could now be doubled after completion of the new quest Client of Kourend, this allowed for 0.1% favour to be gained for every bucket donated to Hosidius. |
| 8 January 2016 (Update) |
Favour was increased from 0.1% every six buckets donated to Hosidius to 0.1% every two buckets. |
Trivia
- Although in RuneScape sulphurous fertiliser can be created by adding saltpetre to compost, in real life saltpetre contains no sulphur, but is instead a mineral containing potassium nitrate (KNO3).
