6-12 months (6–12 months shelf life)
Also known as: digestate pellet storage life
The typical shelf life for properly stored digestate pellets or compost products — 6 to 12 months when kept dry and covered, before nutrient quality begins to decline.
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What is 6-12 months?
The 6-12 month window is the practical shelf life for properly stored digestate-based fertilisers — pelletised dry digestate, granulated compost, or bagged organic manure — beyond which nutrient quality, microbial activity, and physical integrity begin to decline materially. This range applies to products stored in covered, dry conditions at ambient Indian temperatures (25-40 degC) with relative humidity below 60%.
Several degradation pathways act in parallel during storage:
- Nitrogen loss: ammonia volatilisation continues slowly even from dried pellets, particularly above 35 degC. Total nitrogen can drop 10-20% over 12 months.
- Microbial decline: beneficial bacteria and fungi in compost lose viability as moisture drops below 15% and storage time extends.
- Caking and clumping: residual moisture migration during temperature cycling causes pellets to fuse, complicating spreader application.
- Mould growth: if moisture exceeds 18-20%, fungal contamination can render product unsalable.
- Pest infestation: warehouse beetles and rodents target organic granules over multi-month storage.
The Fertiliser Control Order (FCO) under the Essential Commodities Act 1955 requires manufacturers to mark a date of manufacture on packaging and guarantees nutrient content (N-P-K) at the point of sale. Indian CBG plants producing Fermented Organic Manure (FOM) or Phosphate-Rich Organic Manure (PROM) typically print a 6-month or 12-month best-before window to stay safely within FCO compliance margins.
Storage practice trades off cost against shelf life. A simple tarp-covered stockpile costs almost nothing but limits useful life to 3-4 months in monsoon-prone regions. A pucca godown with raised pallets, ventilation, and HDPE-lined bags extends shelf life to 12 months but adds 50-150 INR per tonne in storage cost. Most operators align production cycles with the kharif (June-October) and rabi (November-April) sowing seasons, sizing storage to bridge the 3-4 month gap between harvest and next application rather than holding inventory across a full year.
Common questions about 6-12 months
Plain-English answers to what people most often ask.
How should digestate pellets be stored to maximise shelf life?
Can pellets with visible mold still be used?
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