WASHINGTON — The preliminary national average price received by farmers for all wheat in September was $7.53 per bu, down 8c from $7.61 in August but up $1.74 from $5.79 in September 2010, the U.S. Department of Agriculture said in its latest Agricultural Prices report.

The average price paid for winter wheat in September was $6.99 a bu, down 27c from $7.26 in August but up $1.23 from $5.76 in September 2010. The average price paid for durum was $10.60 per bu, up 40c from $10.20 in August and up $5.71 from $4.89 a year earlier. Spring wheat other than durum averaged $8.13 per bu, down 17c from $8.30 in August but up $2.16 from $5.97 in September 2010.

The average price paid for rough rice in September was $13.80 a bu, up 20c from $13.60 in August and up $2.70 from $11.10 a year ago.

The September index of prices received by farmers for food grains was 245 compared with the 1990-92 base of 100, down 2% from 249 the previous month but up 30% from 189 in September 2010.

The September index of feed grains was 281, unchanged from the previous month but up 62% from 173 in September 2010. The average price paid to farmers for corn was $6.69 a bu, down 19c from $6.88 in August but up $2.61 from $4.08 in September 2010. Farmers received an average of $11.70 a cwt for grain sorghum in September, up $1 from August and up $4.44 from $7.26 in September 2010. The average price paid for oats in September was $3.32 a bu, up 13c from $3.19 in August and up $1.02 from $2.30 in September 2010.

The index of September prices received for oilseeds was 215, down 10% from 239 in August but up 44% from 149 in September 2010. Farmers received an average of $13.10 a bu for soybeans in September, down 30c from August but up $3.12 from $9.98 in September 2010.

The September index for dairy products was 160, down 5% from 168 in August but up 18% from 136 in September 2010. The average price for all milk in September was $20.10 a cwt, down $1.90 from August but up $3.10 from $17 in September 2010.

The September poultry and egg index was 147, down 8% from 160 in August but unchanged from the previous year. The average price paid to farmers for all eggs in September was $1.03 a dozen, down 14c from $1.17 in August but up 35c from 68c in September 2010.