RE Barb R.

Yes I will elaborate on Greensand, however you will have to give me a
day or two.  I need to dig out an old notebook and call in some backup. 
In the mean time I would say that; yes, my opinion about the value of
greensand is based on the nearly perfect unavailability of the K and
micronutrients the sand contains. 
	 More soon.
	Andrew E. Ashley