Mineralized N in soil applied with
manures and fertilizers was investigated using a soil incubation
study (Sahrawat, 1983b). Twenty gram of air-dried soil was placed
in a 500-mL incubation bottle and treated with manures and
fertilizers at the same application rate with field experiment. Fifty
milliliter of deionized water was added to give a standing water
layer of 2-3 cm above soil surface.