Improving Ammonium and Nitrate Release from Urea Using Clinoptilolite Zeolite and Compost Produced from Agricultural Wastes

Table 1

Selected chemical properties of Bekenu Series.

Property	Value obtained	Standard data range
	(mean ± SE)
CEC (cmolc kg^−1)	7.43 (±0.15)	8.0–24
pHwater	4.66 (±0.10)	4.60
Exchangeable calcium (cmolc kg^−1)	1.41 (±0.05)	0.01
Exchangeable magnesium (cmolc kg^−1)	1.53 (±0.05)	0.21
Exchangeable potassium (cmolc kg^−1)	0.60 (±0.02)	0.19
Total nitrogen (%)	0.15 (±0.01)	0.04–0.17
Organic matter (%)	2.06 (±0.10)	nd
Total carbon (%)	1.20 (±0.60)	0.57–2.51
Available phosphorus (mg kg^−1)	4.16 (±0.13)	nd
Exchangeable ammonium (mg kg^−1)	19.85 (±0.68)	nd
Available nitrate (mg kg^−1)	5.16 (±0.09)	nd

Note. Standard data range reported by Paramananthan [24]; nd = not determined.
Values in parenthesis represent standard error of the mean.