The most-traded May copper contract on the Shanghai Futures Exchange climbed 1.1% to 67,770 yuan ($10,421.34) a tonne. Earlier in the day, it hit its highest since March 3 at 68,230 yuan.
"That is more than usual. But we have had a pretty good run-up in prices," said Kress, who grows about 3,000 acres (12 square kilometers) of wheat each year in southeast Idaho.
Only a break above $1,761 could signal the completion of the wave C. On the daily chart, gold is still testing the support at $1,723, the 76.4% projection level of a downward wave C from $1,959.01.
Meanwhile, Dalian's most-active soyoil contract fell 1%, while its palm oil contract slipped 3.5%. Soyoil prices on the Chicago Board of Trade were down 1.1%.