CHICAGO, July 21 (Reuters) - Spot basis bids for corn and soybeans were mixed in the U.S. Midwest on Monday as futures dropped and selling remained slow.

• Farmer sales of both commodities have been slow this week as cash prices are hovering near recent lows.

• Warm weather and heavy rains have created a beneficial greenhouse-like effect for the corn and soy crops in the U.S. Midwest.

• CBOT September corn futures CU25 were last down 7-1/4 cents at $4.01 per bushel, while new-crop December corn CZ25 was down 7 cents at $4.20-3/4 a bushel as of midday.

• CBOT August soybean futures SQ25 were down 12-3/4 cents at $10.15 per bushel. New-crop November soybeans SX25 were down 11-1/4 cents at $10.24 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

--------------------------------------------------------

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 in Chicago; Editing by Nia Williams)

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