Grain futures posted gains across the board on Tuesday following solid crop progress and export data. December Corn futures rose 2.5 cents to 535'6 as good-to-excellent conditions unexpectedly improved to 57%. November Soybean futures rallied nearly 25 cents off their morning lows to close at 1318'6 after weekly export inspections exceeded estimates at 673,000 metric tons. December Wheat futures also climbed 6.5 cents to 728'4 as the spring harvest reached 93% complete.