Compost is composed of decomposing different organic substances like cow dung, poultry litters, plant debris etc. In contrast, slurry is the remaining substances in the fermentation tank after producing bio-gas. However, which one is more nutrient enriched substance?
a semi-liquid mixture, typically of fine particles of manure, cement, or coal suspended in water. It might be mire or muck, silt, alluvium, etc.
Meanwhile, compost is a refuse heap or a mixture of ingredients used to fertilise and improve soil. Compost is commonly prepared by decomposing plant and food waste, recycling the organic materials so that the mixture is rich in plant nutrients and beneficial organisms such as worms and fungal mycelium.
Thus, depending on the raw material from which it is made, compost might always be relatively richer than slurry and vise versa. Copost normally contains at least a bit or even a lot of all the nutrients present in slurry.
Slurry might be easily absorbed by plants but will last for a shorter period as compared to compost.
The answer to the question "which one is more productive?" is always "depend on the environment you are applying it into".
The answer to the question "which one is more enriched?" is always "depend on the nutrient you require/need".
Slurry contains anaerobic microbes, ammonium ion, and VFA/SCFA among others. Not to mention the high percentage of water. Further processing may be required to increase the uptake efficiency. It may be good for application in dry soil or flooded paddy field.
On the other hand, compost contains many kinds of aerobic microbes as well as small/tiny detritivores. It may be mildly acidic depend on the ingredient. Recommended application is in moist soil in a mildly basic environment. For application in normal environment, additional calcit/dolomit/lime may be required.
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