Cenex Harvest States Cooperatives today reported earnings of $5.0 million for the first half of its fiscal year, which ended February 29, 2000, a decline of $11.9 million, or 71 percent, from $16.9 million for the same period the previous year.For the second quarter of fiscal 2000 (December 1999 - February 2000), it reported a net loss of $4.