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Little River, TX | Went to the listing of Agronomy Facts and looked at #14 about potassium.
I will leave the corn to my betters, but I saw some inconsistencies in their data for alfalfa.
Page 1. has a 5 ton alfalfa crop removing 230 lbs K2O, by my reckoning that is 1.91% K in the hay. To my thinking it is a little low. Maybe fits with average K levels in Penn alfalfa as seen by Penn State Lab?
What I consider a good level would remove 300 lbs of K2O, or 60 lbs K2O per ton, or be 2.50% K.
Page 3. Figure 4. They say Plant Nutrient Needs (alfalfa) is 65 lbs per ton (or 2.71% K) which is 340 lbs total for a 5 ton yield. Considerably more than the 230 lbs mentioned on Page 1, figure 1.
As I said I am being picky.
I do like their definition of CEC being the amount of negative in a soil, or possibly the amount of negatively charged soil surfaces. . | |
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when to apply p and k
