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Full-Text Articles in Physical Sciences and Mathematics
Soil Ph: What It Is, How It Is Measured, Why It Is Important, John H. Grove
Soil Ph: What It Is, How It Is Measured, Why It Is Important, John H. Grove
Soil Science News and Views
Soil pH is related to the hydrogen ion (H+) activity of the soil-water system. The chemical definition of pH is as follows: pH=-log (H+). In other words, for a pH drop of 1 unit (e. g. from pH 6 to pH 5) there will be a ten~fold increase in H+ activity in the soil solution. If pH 1 rises by 1 unit, only one-tenth as much acidity will be present in solution. As such, pH is only a measure of the active acidity in the soil water solution bathing plant roots. This fraction of total …
Liming Tobacco Soils, J. L. Sims
Liming Tobacco Soils, J. L. Sims
Soil Science News and Views
Control of soil acidity by liming is very important in successful tobacco culture. Adding lime to an acid soil increases the availability of nearly all plant nutrient elements, increases the efficiency of added fertilizers, and prevents the toxic effects of high concentrations of soluble aluminum, manganese, and iron. It is a natural tendency for most Kentucky soils to become acid with time due to losses of bases (calcium, magnesium, potassium, and sodium) from soil by rainfall, However, tobacco soils possess certain unique problems that warrant careful monitoring of soil pH every two to three years.