CLUB DE CIENCIAS

9. PH

https://www.thespruce.com/do-it-yourself-soil-ph-test-4125833

https://www.preclaboratories.com/epa-science-experiment-measuring-soil-ph/

https://www.rhs.org.uk/soil-composts-mulches/ph-and-testing-soil

https://www.adwainstruments.com/support/knowledge-base/how-to-test-soil-ph  ( aparato electrónico).

https://courseware.cutm.ac.in/wp-content/uploads/2020/05/Determination-of-soil-pH.pdf