Table 3.

Mineral composition of straw.

Parameter	Cotton stalk (range)	Rape stalk (range)	Corn (range)	Wheat (range)	Rice (range)
Carbon (%)	42.50–51.40	37.15–47.50	39.68–47.70	38.07–47.09	37.40–46.12
Nitrogen (%)	0.56–1.69	0.23–1.69	0.15–1.68	0.23–1.04	0.13–1.58
Phosphorus (g/kg)	0.39–3.15	0.15–3.42	0.04–3.65	0.13–1.75	0.30–10.59
Potassium (g/kg)	1.30–20.14	2.94–31.58	3.70–38.41	2.78–47.81	6.26–35.38
Sulfur (%)	0.29–1.21	0.15–1.04	0.15–1.04	0.19–0.90	0.18–0.77
Oxygen (%)	38.49–49.02	15.24–18.30	36.13–49.17	37.52–47.35	33.56–44.53
Hydrogen (%)	4.39–6.86	4.60–6.75	4.31–8.68	4.05–6.58	4.39–8.46