On 07/07/2016 06:40 AM, The Cook wrote:
They are rich in
potassium with good amounts of calcium, magnesium and phosphorus. They
also have small amounts of iron, sodium, zinc, copper, manganese and
selenium.

An interesting observation: these metals (a.k.a. minerals) will
not be in the plant unless they are in the soil first. Depleted
soil is a huge and fascinating subject