INFLUENCE OF MINERAL PHOSPHATE FERTILIZATION ON ACCUMULATION OF CADMIUM IN SOIL

Authors

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.

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Sinai Journal of Applied Sciences
Volume 8, Issue 2
August 2019
Pages 173-184

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