4.3 Article

Soil properties influence distribution of extractable boron in soil profile

Journal

COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS
Volume 39, Issue 15-16, Pages 2319-2332

Publisher

TAYLOR & FRANCIS INC
DOI: 10.1080/00103620802292418

Keywords

extractable B; hot CaCl(2); KH(2)PO(4); relationship; soil properties; tartaric acid

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Depth distribution of boron (B) extractable by hot calcium chloride (HCC), potassium dihydrogen phosphate (PDP), and tartaric acid (TA) in some typical B-deficient Inceptisols, Entisols, and Alfisols in relation to soil properties was studied. The magnitude of B extraction followed the order HCC > PDP > TA for Inceptisols, TA > HCC > PDP for Entisols, and PDP > HCC > TA for Alfisols and showed a decrease along soil depth. The low pH of TA and effective desorption of B by phosphate of PDP are attributed to their higher efficiency in extracting B in Entisols and Alfisols, respectively. A decrease in organic carbon (C), clay, and amorphous iron oxide content was responsible for the observed decrease in extractable B along depth of soil profile. The HCC showed more efficiency than PDP and TA for extracting B in soils high in organic C. Multiple regression equations explained only 21, 57, and 59% of the variability in PDP-, HCC-, and TA-extractable B content in soils by the soil properties analyzed, of which organic C and clay were the most important. There were dynamic equilibria among the amount of B extracted by the extractants, indicating B extraction by them from more or less similar pools in the soils.

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