In 1978 a survey was done in the Willamette Valley to explore the relationship between soil nutrient values and tissue nutrient concentrations.
Jackson, T.L; OSU Dept of Soil Science
Bostdorf, R. and Bissel, S.; Marion County Extension
It is unknown if this survey was published, or if it was, where it was published. This copy may be one of the only remaining copies in exsistence. Unfortunately this copy may be a draft as there are some comments in the margins and numbering of figures/tables are off. But this was an incredibly detailed and useful study and we feel that this warrents posting this report "as-is".