Research Article
Nutrient Availability and Changes on Chemical Attributes of a Paleudult Soil Amended with Liquid Sewage Sludge and Cropped with Surinam Grass
Table 2
Chemical composition of sewage sludge used in the experiment.
| | Parameter | Unity | | Year of application | | | 2003 | 2004 | 2005 | 2006 |
| | Moisture | % | 97.4 | 98.8 | 97.8 | 99.0 | | pH | –- | 11.1 | 11.9 | 11.8 | 10.1 | | Organic carbon | g kg -1 | 262 | 327 | 282 | 448 | | Total N (Kjeldahl) | g kg -1 | 33 | 39 | 28 | 45 | | Ammonium-N | g kg -1 | 51.0 | 4.6 | 1.3 | 3.5 | | Nitrate+nitrite-N | g kg -1 | 0.40 | 0.35 | 0.55 | 1.42 | | Sulfur (S) | g kg -1 | 2.9 | 9.4 | 5.6 | 4.5 | | Magnesium (Mg) | g kg -1 | 2.7 | 3.4 | 2.9 | 3.4 | | Aluminum (Al) | g kg -1 | 2.4 | 1.4 | 1.7 | 1.1 | | Calcium (Ca) | g kg -1 | 124 | 115 | 69 | 75 | | Phosphorus (P) | g kg -1 | 7.9 | 12.3 | 7.5 | 5.7 | | Potassium (K) | g kg -1 | 1.9 | 9.1 | 16.2 | 8.6 | | Sodium (Na) | g kg -1 | 2.3 | 8.5 | 4.5 | 13.5 | | Arsenium (As) | mg kg -1 | <1.0 | <1.0 | <1.0 | <1.0 | | Cadmium (Cd) | mg kg -1 | 1.0 | 5.4 | 1.3 | <1.0 | | Lead (Pb) | mg kg -1 | 35.7 | 27.4 | 8.7 | 21.0 | | Cobre (Cu) | mg kg -1 | 437 | 452 | 419 | 267 | | Cromo (Cr)-total | mg kg -1 | 14.0 | 31.3 | 6.3 | 5.0 | | Mercurium (Hg) | mg kg -1 | <1.0 | <1.0 | <1.0 | <1.0 | | Molibdenum (Mo) | mg kg -1 | <1.0 | <1.0 | <1.0 | <1.0 | | Nickel (Ni) | mg kg -1 | 9.2 | 47.0 | 9.0 | 6.3 | | Selenium (Se) | mg kg -1 | <1.0 | <1.0 | <1.0 | <1.0 | | Zinc (Zn) | mg kg -1 | 486 | 845 | 439 | 208 | | Boron (B) | mg kg -1 | 8.7 | 14.8 | 14.6 | 12.6 |
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