Corn and wheat prices advanced on Thursday amid speculation that the yields may be boosted amid worsening crop conditions and slower process of planting in the U.S., the world's largest exporter of the commodities. July Corn futures rose 0.2% to $6.48 a bushel on the CBOT and was traded at $6.475 as of 9:56 a.m. Singapore time, while wheat for delivery in the same month added 0.2$ to $7.225 a bushel.