Effect of Nitrogen Sources on Microbial Biomass Nitrogen under Different Soil Types

Table 1

Chemical and physical properties of soil and organic matter.

Parameter	Clay* soil	Silt loam*; soil	Organic matter
			Sludge	Straw
pH (solid/water)	5.45	5.2	7.91	6.03
Total C (%)	3.01	3.2	33.30	22.00
Total N (%)	0.32	0.12	2.84	5.45
C/N ratio	9.38	26.6	11.9	4.00
Total P (mg Kg^−1)	600	250	4800	2600
Organic matter (%)	5.17	0.25	38.72	40.55

*(According to [22]).