Telling my teaching story... everyday is an adventure!
Plants-
https://www.ck12.org/my/c/biology/photosynthesis/lesson/user%3Akatieborton/Photosynthesis-and-the-Role-of-Soil-Borton/?view=draft
https://www.nrcs.usda.gov/wps/PA_NRCSConsumption/download?cid...ext=pdf
http://scienceline.ucsb.edu/getkey.php?key=96
https://www.dpi.nsw.gov.au/agriculture/soils/improvement/plant-nutrients