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 on the farm since weed seeds in the raw state get destroyed during the fermentation process in the digester.
  • Enhances activity of beneficial microbes in soil.

Nutrients Present in Bioslurry

  • Being high-quality organic manure it can be used to increase agricultural product yield.
  • Decreases the use of costly chemical fertilizers hence saving income.
  • Improves water holding capacity, stabilizes humid content, and prevents the leaching of nutrients from the soil.
  • Can be used as feeding material for fish.
  • Can be used as a bio-chemical pesticide, where chemical pesticides can be mixed with bio-slurry in 15-20%. This biochemical pesticide controls different kinds of pests & insects harmful to 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 the field using a bucket or can be discharged through an irrigation canal.
  • Before using should be diluted with water at a ratio of 1:1.5-2 because due to high concentrations of ammonia & phosphorus cause a burning effect on tender plant parts.

Dried Form

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

Composted Form

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

Nepal Biogas Promotion Association (NBPA)
Central Office Kathmandu
Santinagar, Gyankunja Marga Ward No:31 Home No. 131/23 Near to Tinkune Pool.
P.O. Box No: 10074
Kathmandu, Nepal

Tel. +977 (01)-4622113 or M: 9851321496

©2023 Nepal Biogas Promotion Association. All rights reserved. Developed by Clock b Business Technology.

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