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The mixture of dung and water which enters the biogas plant in semi liquid form is called “undigested slurry.” The undigested slurry undergoes a series of anaerobic digestion processes or fermentation in a biogas digester and is converted into combustible gas called “biogas.” Biogas slurry is one of the end products of the anaerobic digestion in the biogas plants. The mixture of animal/human waste and water put into the biogas plant undergoes a process of anaerobic digestion or fermentation in a bio-digester. During digestion, 25–30 % of the total dry matter of animal/human waste will be converted into a combustible gas and residue of 70%–75 % of total solids content of fresh dung comes out as sludge, biogas slurry. The slurry consists of 93% water and 7% dry matter of which 4.5% is organic and 2.5% inorganic matter. Percentage of N, P, K content in slurry on wet basis is 0.25, 0.13 and 0.12 while on dry basis it is 3.6, 1.8 and 3.6 respectively. In addition to the major plant nutrients, it also provides micro-nutrients such as zinc, iron, manganese and copper that are also essential for plants, but required in trace amounts. A comparison of biogas slurry with fresh manure is shown below: Experimental results have shown an increase of yields by 10-25% using bio gas slurry (Gofran,2012). Bio Gas slurry can be used directly by mixing it with irrigation water. Wet application is rather cumbersome; therefore, farmers prefer to use dry slurry in their farms. For dry use, composting of the slurry is highly recommended. It improves physical structure of soil, increased fertility and water-holding capacity of soil, and enhanced activity of the micro-organisms in the soil.