Home > Community > What is the relationship between soil pH and soil electrical conductivity? What formula and trendline should it follow? Please give accurate and reliable responses.
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Nancy M. Bennetts ?

What is the relationship between soil pH and soil electrical conductivity? What formula and trendline should it follow? Please give accurate and reliable responses.

Blessing Emmanuella  Follow

The desirable soil pH range for optimum plant growth varies among crops. While some crops grow best in the 6.0 to 7.0 range, others grow well under slightly acidic conditions. Soil properties that influence the need for and response to lime vary by region. A knowledge of the soil and the crop is important in managing soil pH for the best crop performance.

Soils become acidic when basic elements such as calcium, magnesium, sodium, and potassium held by soil colloids are replaced by hydrogen ions. Soils formed under conditions of high annual rainfall are more acidic than are soils formed under more arid conditions. Thus, most southeastern soils are inherently more acidic than soils of the Midwest and far West.

Soils formed under low rainfall conditions tend to be basic with soil pH readings around 7.0. Intensive farming over a number of years with nitrogen fertilizers or manures can result in soil acidification.

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Alloyce Jackson  Follow

The lower soil pH indicates larger number of hydrogen ions in the soil. Hydrogen ions can appear in varying amount in the soil environment which can affect the level of electrical conductivity. Higher amount of hydrogen ions in the soil will show a higher rate of electrical conductivity.

The values of log i/[H+] and log 1/ [OH"] generally are referred to as pH and pOH, respectively. These values are indices of the acidity or alkalinity of a system. Any system in which pH and pOH are equal is neutral. At 22^ C, when Kw=io-i*, neutrality corresponds to pH=pOH = 7.

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