The Subject of Phosphorus & NPK

Thank you. Yes that video is one of my favorites. Very eye opening and helpful to put things into perspective.

I add lots of balanced organic matter every year so I will try not to over think it.

However I think it would also be interesting to see analysis of various JLF at different stages (1 month - 3 month - 1 year - 3 year - etc) to get an idea of how the nutrients change over time.

Thank you again

I think the last one you put together is sensible.
This video I uploaded will be helpful.
https://youtu.be/Ov_5_SOMCOA

We aim for organic farming. Soil testing is also done in organic farming. Here, when P and K are insufficient, the prescription is to enrich the organic matter.