CHICAGO, April 1 (Reuters) - Spot basis bids for corn and soybeans were steady-to-higher at U.S. Midwest processing plants and river elevators on Tuesday on slow farmer sales, while bids at interior elevators were mostly flat, grain merchants said.

* Chicago Board of Trade corn and soybean futures climbed on Tuesday, but farmer selling remained minimal as prices remain near recent lows. Many growers are also focused on spring planting preparations instead of on marketing grain.

* The U.S. Department of Agriculture on Monday projected a larger-than-expected increase in U.S. corn acreage in 2025 while soybean plantings were seen down from last year.

* Markets remain in edge ahead of the expected announcement by the Trump Administration of broad tariffs on imports into the United States. The tariffs are expected to trigger retaliatory trade actions that are likely to target U.S. agricultural goods.

* CBOT May corn CK25 was up 4-3/4 cents near midday on Tuesday at $4.62 a bushel while May soybeans SK25 were up 16-1/4 cents at $10.31 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 Karl Plume; Editing by Krishna Chandra Eluri)

((karl.plume@thomsonreuters.com; +1 313 484 5285))