Abstract
This study was undertaken to characterize the relationship between Mehlich 3, diethylenetriaminepentaacetic acid (DTPA)–sorbitol, and hot water boron (B) soil extraction. Influence of sorbitol in DTPA extractant on the extraction of copper, zinc (Zn), iron (Fe), and manganese (Mn) was also tested, and 147 agriculture topsoil samples from arable land were collected for the study. The soil samples represented all major soil types, climatic regions, and proportions of agronomic cultures in the Czech Republic. Differences between the methods were statistically significant. The DTPA–sorbitol extracted less than 50% of the hot‐water‐extractable B and Mehlich 3 extracted similar amounts of B as hot water extraction. The relationships between hot water extraction and DTPA–sorbitol or Mehlich 3 were linear in the whole range of B contents in the soils tested. The influence of addition of sorbitol on Zn and Cu extraction was found to be statistically significant but negligible (differences less than 3% rel.). In contrast, extraction of Mn and Fe was depressed by 10% or 15%, respectively, in the presence of sorbitol. Mehlich 3 can be used for B determination without any modifications, and the results are comparable to the values of B in the hot water extract. Boron determination in Mehlich 3 was found to be the most cost and time effective way for soil testing in the Czech Republic.
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