Dear all,

I have a literature-related question for the horticulturists among you: I am looking for the chart I've attached showing plant nutrient availability in soil and soilless culture.

It was published in the book chapter called "Chapter 3: Growing the C3 plant - pH and water". Do you happen to know which book this might be? Alternatively, I would be glad if anyone could tell me where the right part of the chart (soilless culture) originates.

I could already track down the left part to Pettinger, Nicholas (1936): A useful chart for teaching the relation of soil reaction to the availability of plant nutrients to crops. Virginia Agricultural and Mechanical College and Polytechnic Institute and the United States Department of Agriculture, Cooperating, Blacksburg).

Thank you in advance for any hints!