CHICAGO, Jan 28 (Reuters) - Spot basis bids for soybeans and corn were mixed in the U.S. Midwest on Tuesday, following a swell of farmer selling the previous week, while Chicago Board of Trade corn and soybean futures steadied after the previous day's slide.

* The soy basis fell at an Ohio elevator, an Illinois River terminal and Iowa River terminal. The basis rose at an Indiana processor.

* The corn basis rose at an Ohio elevator and was steady elsewhere.

* Some buyers have already purchased enough grain and oilseed for short-term needs, leading to a weakened basis in some areas, an analyst said.

* Weaker crush margins have also discouraged some buyers from raising basis bids.

* U.S. corn, soybeans and wheat steadied on Tuesday as wider markets recovered after a day-earlier slide when investors were rattled by U.S. tariff threats against Colombia and the emergence of a low-cost Chinese artificial intelligence model.

* Most-active CBOT corn futures Cv1 were last up 4-3/4 cents to $4.87 a bushel, while most-active soy futures Sv1 were last down 1/4 cent to $10.44-3/4 a bushel.

Basis values are quoted against CBOT futures in cts/bu:

NOTE: 0 = Option price, UNC = Unchanged, UNQ = Unquoted

NC = Not comparable, DP = Delayed price, N/A = Not available,

F = January, H = March, K = May, N = JulyQ = August, U = September, X = November, Z = December

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LINKS: 0#USCSHGRN-PM

For U.S. forward basis spreadsheets, please click:

CORN/BASIS, SOYA/BASIS, WHEAT/BASIS, MILO/BASIS

- CBOT corn report COR/

- CBOT soybean report SOY/C

- CBOT wheat report WHE/C

- U.S. grain barge freight values BG/US

- U.S. Midwest cash grain PM GRA/PM

- U.S. CIF/FOB Gulf Grain GRA/F

(Reporting by Heather Schlitz; Editing by Rod Nickel)

((Heather.Schlitz@thomsonreuters.com;))