Abstract
Correlation of Sikora and Smith-McLean- Pratt Soil Buffer pH Measurements
Highlights
Crop yields in acidic soils can be limited by several factors, namely reduced root growth and vigor caused by metal toxicity (e.g. aluminum (Al), iron (Fe), and manganese (Mn)), and reduced availability of essential plant nutrients
The Sikora buffer solution was designed as a replacement for SMP and contains no hazardous chemicals
A strong positive correlation was observed between SMP and Sikora buffer pH measurements
Summary
Crop yields in acidic soils can be limited by several factors, namely reduced root growth and vigor caused by metal toxicity (e.g. aluminum (Al), iron (Fe), and manganese (Mn)), and reduced availability of essential plant nutrients. Remediation of acid soils requires the neutralization of the total soil acidity, which can be conceptualized as two main pools, active acidity and reserve acidity. Reserve acidity buffers the soil pH (active acidity) and requires some form of titration to measure, as it is caused by acidic cations (e.g. Al3+, Fe3+, and H+) sorbed to the cation complex. Given the time-consuming nature of soil titrations, pH buffers are often used instead to quantify total soil acidity and to generate lime recommendations. Both soil pH and buffer pH are used, where soil pH is used to determine if lime should be applied and the buffer pH is used to determine the amount of lime required to achieve the target pH
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