Figure 9.27 Effect of soil textural class on the amount of limestone required to

Question

Figure 9.27 Effect of soil textural class on the amount of limestone required to raise the pH of soils from their initial level to pH 6.5 Note the very high amounts of lime needed for fine- 7.0 Silt loams, CEC Loams, CEC 15 Clay loams, CEC 6.5 textured soils that are strongly buffered by their high levels of clay, organic matter and CEC. The chart is most applicable to -- Sandy loams, CEC Sands. CEC-5 1 soils in cool, humid regions where 2:1 clays predominate. In warmer regions where organic matter levels are lower and clays provide less CEC, the target pH would likely be closer to 5.8 and the amounts of lime required would be one-half to one-third 5.0 of those indicated here. In any case, it is unwise to apply more than 7-9 Mg/ha (3-4 tons/acre) of liming materials in a single 4.5 application, If more is needed, subsequent applications can be 01 2 3 4569113 14 1516 1719 Ground limestone to raise pht to 65(M made at 2 to 3-year intervals until the desired pH is achieved

Explanation / Answer

As a chemistry expert, I will explain how different soils requires diifferent amounts of lime to get same pH. It is very important to record the soil pH, because it affects many chemical and biological processes. there are various factors that affects the ph of the soil such as, acid rain, fertilizers usage, oxidative wethering, accumalation of water containing dissolved bicarbonates etc. the amount of lime required to change the pH depends on the mesh size of lime and also buffering capacity of the soil. soils with high buffering capacity requires a greater amount of lime to obtain an equivalent change in pH.

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