how do you determine soil charge with ΔpH?
my lecturer asked how we could determine the charge on clay soils with the ΔpH given.
what is ΔpH anyway? and how do i use that to determine the soil charge.
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If you take a soil sample to a nursery that sells plants and does landscaping they can analyze the sample and tell you if it has a ph level and what it is. Different plant need specific levels to grow so they will analyze it for you so you know which plants can grow in the type you have.
Soil pH
The first order of business is a quick review of pH and the associated terminology. Soil pH or soil reaction is an indication of the acidity or alkalinity of soil and is measured in pH units. The pH scale goes from 0 to 14 with pH 7 as the neutral point. As the amount of hydrogen ions in the soil increases, the soil pH decreases, thus becoming more acidic. From pH 7 to 0, the soil is increasingly more acidic, and from pH 7 to 14, the soil is increasingly more alkaline or basic.
Using a strict chemical definition, pH is the negative log of hydrogen (H+ ) activity in an aqueous solution. The point to remember from the chemical definition is that pH values are reported on a negative log scale. So, a 1 unit change in the pH value signifies a 10-fold change in the actual activity of H+, and the activity increases as the pH value decreases.
To put this into perspective, a soil pH of 6 has 10 times more hydrogen ions than a soil with a pH of 7, and a soil with a pH of 5 has 100 times more hydrogen ions than a soil with a pH of 7. Activity increases as the pH value decreases.
Agronomists generally use soil pH as measured in a 2:1 water-to-soil mixture as an index of a soil's acidity or alkalinity. In a soil test report, pH is often reported with descriptive modifier as shown in Table 1.
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