CHICAGO, March 13 (Reuters) - Spot basis bids for U.S. corn and soybeans were mostly unchanged on Thursday, spot checks showed.

* A large grain processor in Decatur, Illinois, increased its spot soybean basis bid by 7 cents a bushel.

* A port facility in Toledo, Ohio, raised its corn basis by 4 cents, while a rail market in Columbus, Ohio, lowered its corn basis by 1 cent.

* Processors have recently increased their corn and soy bids to encourage farmer selling.

* Above-normal precipitation should reduce drought across the Midwest and central Plains this week, weather forecaster Maxar said, as farmers prepare for spring plantings.

* Chicago Board of Trade corn and soybean futures ended stronger after coming under pressure over the last three weeks from worries about trade disputes hurting U.S. agricultural exports.GRA/

Basis values are quoted against CBOT futures in cents/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 = July, Q = August,U = September, X = November, Z = December

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LINKS: 0#USCSHGRN-AM

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

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 AM GRA/M

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

(Reporting by Tom Polansek; Editing by Will Dunham)

((Thomas.Polansek@thomsonreuters.com))