Calculating Cation Replace Capabilities, Ft Saturation, and you can Calcium Saturation
The intention of this fact sheet would be to explain soil cation replace capacity, foot saturation and you may calcium saturation, and you can have indicated exactly how these types of viewpoints are calculated in the floor attempt profile.
Cation Change Capability (CEC)
Cation replace capability (CEC) are a simple surface possessions regularly predict plant nutrient accessibility and retention from the soil. Simple fact is that potential out of readily available nutrient also have, perhaps not a direct measurement of offered diet. Surface CEC usually develops while the clay stuff and you will all-natural count increase once the cation change happen toward surfaces off clay vitamins, natural count, and sources. Soils for the Ohio can encompass a wide CEC assortment, however, normally slide somewhere within 5 so you can twenty-five meq/100 g crushed (Desk step one). Opinions more than twenty five meq/one hundred g surface are located which have heavier clay soils, normal, otherwise muck grounds.
Cation exchange capacity is defined as a soil’s total quantity of negative surface charges. It is measured commonly in commercial soil testing labs by summing cations (positively charged ions that are attracted to the negative surface charges in soil). Exchangeable cations include base cations, calcium (Ca 2+ ), magnesium (Mg 2+ ), potassium (K + ) and sodium (Na + ), as well as acid cations such as hydrogen (H + ), aluminum (Al 3+ ) and ammonium (NH4 + ).
(Ca 2+ + Mg 2+ + K + + Na + ) + (H + + Al 3+ + NH4 + )
Figure 1 depicts a low CEC surface, which have a handful of negative charges and associated cations (left) and you can a top CEC surface having a larger number of bad charge, filled from the a greater number of full cations (right).