After the completion of bio-gas plant, equal amount of cow dung and water is mixed and send to the digester though the inlet of the Bio-gas plant. Inside the Bio-gas plant decomposition of the mixture takes place to produce methane gas and the remaining portion of the mixture is send through the outlet of the Bio-gas plant which is known as Bioslurry. This viscous liquid contains 93% water and 7% percent dry matter (4.5% organic & 2.5 % inorganic). Bioslurry is a ready-made fertilizer containing every nutrient needed for the plant and can be directly used in fields to grow crops which is more effective in comparison to other fertilizers.

  • Odorless (Fully digested inside the digester).
  • Insects & flies not attracted.
  • Reduces (50%) growth of weeds in farm since weed seeds in raw state get destroyed during fermentation process in the digester.
  • Enhances activity of beneficial microbes in soil.

Nutrients Present In Bioslurry:

 Name of the Slurry

 Phosphorous Potassium
Fresh Slurry (Toilet not connected)

Fresh Slurry (Toilet connected)
Viscous Compost (Toilet not connected)1.65

Viscous Compost (Toilet connected)


  • Being high quality organic manure it can be used to increase agricultural product yield.
  • Decreases the use of costly chemical fertilizers hence saves the income.
  • Improves water holding capacity, stabilizes humid content, and prevents leaching of nutrients from soil.
  • Can be used as feeding material for fish.
  • Can be used as bio-chemical pesticide, where chemical pesticide can be mixed with bio-slurry in 15-20%. This bio-chemical pesticide controls different kinds of pest & insects harmful in agricultural production.
  • Soaking seeds in bio-slurry can induce seedling germination faster & resist diseases.
  • Can be used in earthworm production.
Utilization & forms of bio-slurry

Depending upon the requirement & comfortableness bio-slurry can be used in different forms. Nutritional content varies in different forms of bio-slurry.

Liquid form

  • Can be applied directly in field using a bucket or can be discharged through an irrigation canal.
  • Before using should be diluted with water at ratio of 1:1.5-2 because due to high concentration of ammonia & phosphorus cause burning effect on tender plant parts.


  • Tedious to carry bio-slurry in liquid form.
  • Year round irrigation facility is not available to all farmers.
  • While in irrigation channel bio-slurry has tendency to settle so can't get uniformly distributed.
  • Loss of ammonia in wet slurry.

 Dried form

  • This is practiced as transportation of liquid slurry is difficult.
  • But nitrogen in form of ammonia is lost by volatization & nutritive value of slurry is diminished.
  • So, least efficient method of slurry application.

 Composted form

  • Best form to overcome drawbacks of using in liquid & dried form.
  • Should be taken to field only when necessary & used immediately to prevent nutrient loss.


  • One part of slurry is sufficient to compost about 3-4 parts of dry plant material, result in increased volume of compost in the farm.
  • Dry materials of kitchen & farm waste can be properly utilized.
  • It can be used for algae production, fish rearing, mushroom production.