Rice straw, when used for biogas production in comparison with
other resources like cotton gin, etc. was found best for methane
production but when cotton gin mixed with livestock dung was
fermented; it produced more gas in lesser time [16]. This clearly
states that rice straw and cotton wastes can be used for electricity
generation as well [15]. Apart from gas generation Pakistan has
potential to produce 21 million tons of bio fertilizer per year [9]. A
study shows that manure collected from cow farms has phosphorus
value ranging between 4100 and 18,300 mg/kg of dry matter
[17]. Another research showed that 57% of total manure produced
was collectable and after considering all the losses 19% of the fresh
manure nitrogen, 37% of phosphorus and 29% of potassium were
available to plants and they could compensate almost 20% of nitrogen
and 66% of phosphorus required in the fields [18]. Manure
application can surely reduce the costs of chemical fertilizers and
enhance the productivity of soil while acting as indirect energy
source for the country.