CHICAGO, July 30 (Reuters) – Export premiums for corn and soybeans held mostly steady at U.S. ports on Wednesday, supported by good demand for new-crop supplies and the limited capacity to load vessels of the crops during the approaching harvest, traders said.

* Corn buyers were said to have delayed purchases after futures climbed modestly. Top soy buyer China also remained on the sidelines with near-record export premiums for shipments early next year chilling interest at least for now.

* Bids for both corn and soybeans were weaker in recent days for new-crop shipments in the CIF barge market after the flurry of buying seen last week slowed. But many routine buyers of U.S. corn and soybeans were expected to resume purchasing soon, the traders said.

* Loading capacity is nearly sold out at elevators along the U.S. Gulf Coast and Pacific Northwest until the end of 2014, forcing buyers to pay lofty basis values to guarantee shipments.

* The buying agency for top global wheat importer Egypt bought 175,000 tonnes of wheat from Russia in a tender. No U.S. wheat was offered.

* Private exporters reported the sale of 205,500 tonnes of U.S. wheat to Nigeria, the U.S. Department of Agriculture said. Of the total, 151,500 tonnes was hard red winter wheat, with 131,500 tonnes scheduled for delivery in the 2014/15 marketing year and 20,000 tonnes for 2015/16.

(Reporting by Michael Hirtzer; editing by Gunna Dickson)