pH đất

Soil pH is used to indicate the acidity (or alkalinity) of a soil, which is a measure of the concentration of hydrogen ions (H +) in a soil solution. The pH scale ranges from 1 (acid) to 14 (alkaline), with 7 being neutral and measured on a negative logarithmic scale.

The lower the pH, the higher the acidity in the soil. Most crops are favored by a pH of Ca (measured in 0.01M CaCl 2 solution denoted by pH Ca) between 5.5 and 8. Changes in soil chemistry and microorganisms when the pH is below or on this extent adversely affects the process of the plant with decreasing growth and yield.

Based on the logarithmic scale, soils with a pH of 4 are 10 times more acidic than soils with pH 5, 100 times more so than soils with pH 6 and 1000 times soils with pH 7.

This means that a very small decrease in soil pH results in a large increase in soil acidity.