Table 1.

Characteristics of organic residues and soil.

Parameters	%C	%N	%P	%K	C : N ratio
Soil	0.92	0.08	0.0098	0.0025	11.5
Rice straw	48.90	0.63	0.08	2.35	77.61
Rice root	42.20	0.40	0.29	0.34	105.5
Cow dung	17.43	1.04	0.82	0.68	16.75
Poultry litter	47.41	1.00	0.69	0.95	47.41