Research Article
Improving Ammonium and Nitrate Release from Urea Using Clinoptilolite Zeolite and Compost Produced from Agricultural Wastes
Table 4
Selected chemical properties of humic acid extracted from compost.
| | Property | Value obtained
(mean ± SE) | Tan [25] |
| | E4/E6 | 7.73 (±0.07) | 7-8 | | Phenolic (cmolc kg−1) | 300 (±6.42) | 240–540 | | Carboxyl (cmolc kg−1) | 450 (±10.39) | 150–440 | | Total acidity (cmolc kg−1) | 750 (±8.08) | 500–700 |
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Note. Values in parenthesis represent standard error of the mean. Value obtained from previous study [25].
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