CHICAGO, April 7 (Reuters) - Spot basis bids for soybeans and corn were mostly steady in the U.S. Midwest on Monday as farmer sales remained slow and industry players weighed tariff threats, dealers said.

* The soy basis ticked down at an Ohio elevator. The wheat basis rose at the same elevator, and the corn basis rose at a Nebraska elevator.

* Heavy rain continued to fall in the U.S. Ohio Valley and northern Delta, where extensive flooding already occurred, stalling corn planting, according to weather forecaster Maxar.

* Stronger soy crush margins have improved demand for soybeans from processors, but Chinese tariffs on U.S. agricultural goods will likely decrease demand for U.S. soy products from the world's largest soy buyer.

* Brazil's center-south soybean harvest for the 2024/25 season hit 87% of the planted area as of Thursday, up 11.5% versus the previous year, agribusiness consultancy AgRural said on Monday.

* Trump said he would impose an additional 50% duty on U.S. imports from China on Wednesday if the world's No. 2 economy did not withdraw the 34% tariffs it had imposed on U.S. products last week.

* CBOT May soybean futures SK25 climbed 6 cents to end at $9.83 a bushel. The contract earlier hit new lows not seen since Dec. 19.

* May corn futures CK25 closed up 4-1/4 cents at $4.64-1/2 a bushel.

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 Heather Schlitz; Editing by Lisa Shumaker)

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