INFLUENCE OF MINERAL PHOSPHATE FERTILIZATION ON ACCUMULATION OF CADMIUM IN SOIL | ||||
| Sinai Journal of Applied Sciences | ||||
| Article 7, Volume 8, Issue 2, August 2019, Page 173-184 PDF (798.04 K) | ||||
| DOI: 10.21608/sinjas.2019.79095 | ||||
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| Authors | ||||
Amira H. Ali* ; Ezzat R. Marzouk ; Mostafa A. Hassan
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| Dept. Soil and Water, Fac. Environ. Agric. Sci., Arish Univ., Egypt. | ||||
| Abstract | ||||
| In this current work, the influence of mineral phosphate fertilization on accumulation of cadmium in soil was studied. Rock Phosphate (RP) and Triple super phosphate (TSP) were selected as a common source of P fertilizers and enriched by Cd contamination. An incubation experiment was undertaken for 60 days. Soil was incubated with RP or TSP with 0.0, 20.0, 40.0 and 80.0 kg P2O5 ha-1. Soil samples were then taken after 1, 3, 7, 15, 30 and 60 days from incubation course. The most important results gained from the current study were: Cd concentration in RP was enriched 87 times of crustal abundance where Cd concentration in TSP was enriched 73 times crustal abundance. Although the TSP produced higher available P comparing with RP, the differences were not significant. For both TSP and RP applications, Cd extracted by DTPA as a proxy of bioavailable pool of Cd in soil was increased by increasing the P fertilizer rates and by consequence of incubation period. A negative relationship between soil pH and DTPA-Cd has been obtained. The increase of Cd sorption in this study might be attributed to the increase of soil pH caused by the P additions. This might be obvious in the decreasing of DTPA-Cd under higher pH values. The Cd in TSP might be more readably available than that of RP. The concentration of DTPA-Cd in incubated soil increased slightly due to the application of phosphate fertilizers, but the concentration did not reach contamination levels under different treatments. | ||||
| Keywords | ||||
| Phosphate fertilization; cadmium; Rock Phosphate; Triple super phosphate | ||||
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