I would expect that any weakness will mean more fund selling," said one CBOT rice trader.
Funds were net sellers with Reface the featured player, traders said. Man Financial and RJ O'Brien were also noted sellers.
Volume was moderate estimated at 473 futures and 80 options. That compared to 291 lots traded on Tuesday.
The weakness in futures prices this week coincided with the US Department of Agriculture dropping its weekly world market price for long grain rough rice by 7 cents to $6.39 per cwt.
Warmer, spring time temperatures this week in Arkansas, the top rice state, spurred talk of how many acres US farmers will seed to rice this spring. Low commodity prices plus concerns about soybean rust was expected to play heavily on farmers' planting decisions. Arkansas farmers can start seeding rice by late March if fields dry out by then.