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19
Jan

Soil Sulphur

Sulphur (S) is an essential element for all plants and animals and is a key part of proteins. In legumes, S is a vital component of nitrogen fixation by the bacteria found in legume root nodules. The form in which S is taken up by plants from the soil is as the sulphate (SO42-) anion. Soil sulphate levels are routinely assessed in many NZ soil tests. However, the SO42- ion is very soluble and thus…

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19
Jan

Cation Exchange Capacity (CEC)

This soil parameter estimates the ability of a soil to hold cations (positively charged atoms and molecules) on exchangeable sites, and thus prevent them from being leached through the soil profile. CEC is an important indicator of soil fertility i.e. a soil with a higher CEC will generally be more fertile than a soil with a lower CEC. Why? Because there are more sites available to store plant available cation nutrients…

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