The soil sample I took last fall from my vegetable garden came back from the lab with this result:
Optimum Range Calcium, Mehlich 3 (Ca) 2063 (ppm) H 800 - 1200 Magnesium, Mehlich 3 (Mg) 416 (ppm) H 60 - 120 Potassium, Mehlich 3 (K) 573 (ppm) VH 170 - 280 Phosphorus, Mehlich 3 (P) 248 (ppm) VH 30 - 50
Where "VH" means "very high" and H means "high".
Fortunately the pH is 6.5, which is about where I want it. However, all the lime and manure I've added over the past few years has kind of thrown things out of whack...
- Too much potassium "Causes N[itrogen] deficiency in plant and may affect the uptake of other positive ions such as Mg and Ca".
- Excess phosphorus "shows up as micronutrient deficiency of Zn, Fe, or Co".
Obviously, I don't need to add fertilizer except for nitrogen.
Is this something I should try to balance out? How?