Do you believe in "removal rates" for figuring fertilizer needs? Not arguing, just wondering.

Seems university folks from various states have come up with figures of the amount of nutrients that a specific crop such as corn, soybeans, or wheat removes from the dirt. I haven't seen any updates lately to the IL figures, so I'll assume they're still the same as many yrs ago. The figures below were taken from U of IL Agronomy Handbook (on-line vers), however I added figures converted to local popular fertilzer products, though triple super (0-46-0) is very rare anymore. You can divide the rates by the example yields here & multiply by your factual yields to see if you're close to recs.

Ill guys say 150 bu (or you can adjust rates up/down for yield per bu) corn removes:

60# P2O5 (= 130# 0-46-0)

42# K2O (= 70# 0-0-60)

They say 50 bus beans removes:

42# P2O5 (= 91# 0-46-0)

64# K2O (= 107# 0-0-60)

They say 80 bus wheat (grain only) removes:

72# P2O5 (= 157# 0-46-0)

24# K2O (= 40# 0-0-60)

I don't have a number to use for 90% wheat straw (= short stubble) removal. It obviously removes something though...everything else does.

So-do you believe in replacing these nutrients if you remove them, assuming you intend to farm that same dirt for another 50+ yrs?

Here's link to IL Handbook fert. pgs:

http://iah.aces.uiuc.edu/index.php?ch=ch11/