prov:value
| - For example, the Mehlich-1 extractant was developed to test P, K, Ca, Mg, Zn, Mn, and B in the low pH, medium-to-low CEC soils of the coastal southeastern US. But, Mehlich-1 does not capture all micronutrients well, including copper, which was deficient in coastal NC soils and caused significant economic problems in alfalfa, wheat, barley, oat, corn, and soybean crops.
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