https://www.alliumfields.org/2015/05/is-newspaper-in-compost... has data for you and I believe there is a soil health group at Cornell that published alot of studies.
Here’s an article by a PhD in Horticulture: https://gardenprofessors.com/cardboard-does-not-belong-on-yo...
https://www.alliumfields.org/2015/05/is-newspaper-in-compost... has data for you and I believe there is a soil health group at Cornell that published alot of studies.