Currently urea-treated rice
straw is used as roughage for milking cows in some
dairy farms (Promma et al. 1993). To produce ureatreated
rice straw, 4–6 kg of fertilizer grade urea is
measured by its air-dry weight and dissolved in 100 L
of water. The solution is then poured onto the layer of
rice straw before covering it in a plastic sheath for
between 10 days to 4 weeks (Promma et al. 1993).