Prediction of Soil Cadmium Bioavailability to Cacao (Theobroma Cacao L.) Using Single-Step Extraction Procedures.

In this study, complexation extractants ammonium bicarbonate diethylene triamine pentaacetic acid (AB-DTPA), diethylene triamine pentaacetic Acid (DTPA), ethylene diamine tetraacetic acid (EDTA), and mild cation-exchange extractants calcium chloride (CaCl2) and ammonium nitrate (NH4NO3) were used to evaluate the bioavailability of cadmium (Cd) in soil to cacao in the field. Among the five extractants, the extractable Cd generally followed the order: EDTA>DTPA>AB-DTPA>CaCl2>NH4NO3. Correlation analysis was done between the extractable Cd in soil and total Cd content of cacao tissues (nibs, shells, leaves and pods). The Cd extracted by CaCl2 and NH4NO3 were significantly (p<0.05) correlated with some of the tissues but their Pearson correlation coefficients were weak. In contrast, extractants AB-DTPA, DTPA and EDTA showed stronger, significant correlations to the Cd concentration in all four tissues. Overall, regression analysis demonstrated that AB-DTPA, DTPA or EDTA can be used to predict bioavailable Cd in soils for cacao. Of these, AB-DTPA and DTPA both showed strongest correlations between soil Cd compared to EDTA. However, the ease of preparation and the superior shelf-life of DTPA over AB-DPTA makes it the preferred reagent for Cd bioavailability extractions from cacao soils and is currently being used to develop cost-effective soil treatments to reduce bioavailable Cd to cacao plants.

Bibliographic Details

Main Authors:	Ramtahal, Gideon, Yen, Ivan, Ahmad, Nazeer, Bekele, Isaac, Bekele, Frances, Wilson, Lawrence, Harrynanan, Lisa, Maharaj, Kamaldeo
Format:	Texto biblioteca
Language:	d
Published:	Oxfordshire, United Kingdom Taylor & Francis 2015
Subjects:	theobroma cacao, contamination, cadmium,
Online Access:	https://drive.google.com/drive/folders/1eJzYQK7OknOiKolkHhfQqM55r0uEtZ93?usp=sharing
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