6.  Intangible Assets, Net:

 

Other intangible assets consist primarily of a KCl supply agreement, a trade name, purchased rights to produce SOP and customer relationships.  The trade name has an indefinite life.  The KCl supply agreement, purchased rights to produce SOP and customer relationships are being amortized over 50 years, 25 years and 7 years, respectively.  Amortization expense was $0.5 and $0.3 million during the three months ended September 30, 2011 and 2010, respectively, and $1.5 and $0.9 million during the nine months ended September 30, 2011 and 2010, respectively.