| Soil Type | Organic Matter Content % | ||||
| Soil Series | WRBS | Lang (Lang 1960) | Sivarajasingham (Sivarajasingham 1971) | This study | |
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| Period 1 | Period 2 |
| Carbonate Raw Soil Ramla Series (RS) | Arenosol | 1.4 | 0.5 | 0.6 | 0.8 |
| Carbonate Raw Soil San Lawrenz Series (SLS) | Regosol | 1.6 | 1.8 | 1.9 | 1.7 |
| Carbonate Raw Soil Fiddien Series (FS) | Vertisol and Regosol | 1.4 | 1.6 | 1.6 | 1.8 |
| Xerorendzina San Biagio Series (SBS) | Calcisol | 1.9 | 2.1 | 2.0 | 1.9 |
| Xerorendzina Tal-Barrani Series (TBS) | Luvisol | 3.0 | 4.6 | 3.9 | 3.6 |
| Terra Rossa Tas-Sigra Series (TBS) | Luvisol | 4.5 | 2.7 | 3.0 | 3.0 |
| Terra Rossa Tax-Xaghra Series (TXS) | Leptosol | 4.5 | 3.6 | 3.6 | 3.5 |