Insights

It’s All About CEC, You See

by | Sep 23, 2016

Key Insight

In CRS’ field research, they are finding that many coffee farms are very acidic, so farmers are often wasting money on fertilizer when they could get a lot more benefit from applying gypsum, which is far cheaper!

This is a guest post by Hannah Francis, a Fulbright Scholar working with CRS’ Blue Harvest team in El Salvador this year. Hannah is a soil scientist helping analyze research data from hundreds of coffee farms. This post builds on our recent post called Get Me SOM, and several other posts on soil management on coffee farms.

Guest Post: Hannah Francis

CEC is a measurement of soil health or fertility. Technically, CEC is the electrostatic interaction between the negatively charged surfaces of organic colloids or clay particles and the positively charged ions, or cations, in soils.