Improving Ammonium and Nitrate Release from Urea Using Clinoptilolite Zeolite and Compost Produced from Agricultural Wastes
Table 3
Selected chemical properties of compost by cocomposting rice straw and chicken manure.
Property
Value obtained (mean ± SE)
pH value
7.66 (±0.07)
Humic acid (%)
15.20 (±0.32)
EC (ds m−1)
1.15 (±0.02)
Total carbon (%)
27.32 (±0.42)
Organic matter (%)
47.09 (±0.73)
Total nitrogen (%)
1.80 (±0.06)
C/N ratio
15.17
Ammonium (mg kg−1)
294 (±2.84)
Nitrate (mg kg−1)
161 (±5.23)
Total phosphorus (mg kg−1)
458.20 (±5.50)
Calcium (mg kg−1)
14,080 (±6.91)
Magnesium (mg kg−1)
15,350 (±3.92)
Potassium (mg kg−1)
27,720 (±2.72)
Iron (mg kg−1)
13.10 (±0.42)
Zinc (mg kg−1)
11.80 (±0.15)
Copper (mg kg−1)
12.40 (±0.21)
Manganese (mg kg−1)
2.10 (±0.05)
Note. Values were obtained from our previous study on cocomposting rice straw and chicken manure (paper under review). Values in parenthesis represent standard error of the mean. Carbon to N ratio was calculated by dividing the percentage of C by the percentage of N.
