Quote:
Originally Posted by NANAMAN
It seems as if you are still trying to say that using chem. fertilizers on soils that have mycorrhiza and other microbe populations is somehow not harmful to those populations. And you would be dead wrong!
|
Nope. It depends entirely on the chemical fertilizers and dosages in question. Anything more than a 1/4 teaspoon of Potassium chloride would be bad news for the microbes. Langbeinite (K2SO4·2MgSO4) in a tablespoon dosage would not.
Plants feed on inorganic compounds. From the chemical analysis point of view, one pound of reasonably dry composted horse manure is roughly equivalent to 1.5 tablespoons of a 28-8-18 chemical formula that includes micronutrients. Use what is most cost effective for you.
Anyway, looking at the Cornell Fruit Tool, it appears that Steve's blueberry plants have a magnesium deficiency -- unless they have one of those awful viruses. The latter is usually avoided by maintaining proper levels of zinc and copper in the soil.