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Evaluation of available boron content using eight methods of extraction in different soils from Córdoba and sucre in Colombia

ABSTRACT The aim was to evaluate eight methods of boron (B) extraction in different soils from Córdoba and Sucre, Colombia. 37 samples were collected at a depth of 0–20 cm and carried to Soil and Water Laboratory of University of Córdoba for its chemical characterization. The available boron was extracted with the following methods: modified hot water, calcium chloride (CaCl2) 0.05, hydrochloric acid (HCl) 0.05, barium chloride (BaCl2) 0.006, manitol 0.05 + CaCl2 0.01, Ca(H2PO4)2H2O 0.008 in mol L−1, mehlich-1 and ammonium acetate (NH4OAc) (1.0 mol L−1, pH = 7.0). The major quantity of boron was extracted with mehlich-1, HCl 0.05 mol L−1 and hot water, extracting 0.36, 0.29 and 0.26 mg kg−1, respectively. The extracting solution that correlated with the hot water method was HCl 0.05 mol L−1 (r = 0.81); followed by Ca(H2PO4)2H2O 0.008 mol L−1 (r = 0.62) and mehlich-1 (r = 0.54). According to characteristic and heterogeneity of soils, we recommend HCl method to extract available boron.