The weather outlook, having been crop bears' friend for so much of the summer, swapped allegiance to allow grains and oilseed – even corn – a better day.
Sure, the outlook is exactly disastrous, with drier weather in the Mississippi Delta to "favour corn drydown", weather service MDA said.
Furthermore, according to the GFS weather model, western Iowa is in for some needed rain in the next two days.
However, "dryness will continue to build across north eastern Missouri, north western Illinois, eastern Iowa, southern Minnesota, and western Wisconsin", MDA said, a feature which "will build stress on corn and soybeans".
"Drier weather in the north western Midwest will allow moisture shortages to build further there."
'Scant rain prospects'
At RJ O'Brien, Richard Feltes said that "scant rain prospects should be supportive for soybeans".
CHS Hedging said that "weather forecast show signs of drier and hotter conditions to come in the near term", attributing the outlook for firmer prices of both soybeans and corn too.
Indeed, in the end, December corn posted the strongest finish, ending up 1.8% at $4.55 ¼ a bushel, meaning it is still, just, ahead for the week so far despite its drubbing in the last session.
November soybeans added a more modest 0.9% to close at $12.39 a bushel.
That was not because soybean bulls did not have some other cards to play, beyond weather, with the US Department of Agriculture announcing the sale of 110,000 tonnes of new crop soybeans to China, the latest in a series of purchases.
Furthermore, in Argentina, the top soymeal and soyoil exporting country, soybean crush workers at the port of Rosario staged a one-day strike.
(Not that all commentators saw this as hugely bullish, with Joyce Loi at Phillip Futures saying that usually, Argentine strikes are short-lived, meaning the industrial action should have "no significant impact on the global supply of grains.
"Therefore, we do not expect the strike in Argentina to have an effect on prices," Ms Liu said.)
However, corn had some decent data of its own to factor in, with the US reporting weekly ethanol production up 4,000 barrels a day at 857,000 barrels a day.
While not a huge rise, many investors had expected a fall, given that many ethanol plants go offline for annual maintenance at this time of year.
Furthermore, many investors are alarmed at the relative expense of soybeans compared with corn, with the ratio of Chicago's November soy contract to December corn futures closing at 2.75: 1 last night.
"It is now at 2.72: 1," US Commodities said.
"The normal is 2.4: 1. This would mean November soybeans should be at $10.75 a bushel, or December corn at $5.08 a bushel to make the ratio normal."
The idea Agrimoney.com espoused of the high ratio encouraging extra South American soybean sowings received some support when Safras e Mercado forecast the region's production of the oilseed soaring 15m tonnes next season, a negative for prices.
The USDA has factored in an extra 6m tonnes for Argentina, Brazil and Paraguay combined, countries responsible for the vast majority of South American output.
Another spread that investors have been monitoring closely is that between corn and wheat, whose progress has been widely deemed to have been held back by the poor performance of its fellow grain.
But just because corn jumped on Wednesday did not meant that wheat could follow suit this time, adding only 0.4% to $6.30 ½ a bushel for September delivery, and 0.2% to $6.42 ¾ a bushel for December.
The US weather outlook, while supportive for row crops, was one setback for the grain.
"The drier pattern in the northern Plains and Prairies will favour spring wheat harvesting," MDA said.
Meanwhile, "recent abundant rains across the central Plains have significantly improved moisture, which will favour winter wheat once planting begins in a few weeks".
The turmoil in Egypt, the top wheat importing country, after scores of people were killed when security forces stormed two protest camps in Cairo hardly improved the mood among wheat investors.
This is the first week in six, so far, that Egypt's Gasc grain authority has not announced an import tender.
Meanwhile, Germany's grains crop, the European Union's second largest, received an upgrade from the DRV farm co-operatives group, of 700,000 tonnes to 47.0m tonnes.
Indeed, while EU weekly wheat export data came in strong at 694,000 tonnes, Paris wheat for November eased 1.0% to E182.00 a tonne, the lowest finish for a spot contract since December 2011.
Among soft commodities, arabica coffee futures, which mirrored corn in collapsing in the last session, staged a recovery on Wednesday too, after losses to frost in the Brazilian state of Parana last month were estimated stronger than investors had expected.
The state's farm ministry estimated losses at 62% of the 2014 crop, equivalent to about 1m bags - not huge on a world perspective, but enough to encourage short-covering.
Arabica coffee for September added 1.7% to 122.65 cents a pound in New York.
But raw sugar did not prove so capable of riding out a weaker real, which reduces the value in dollar terms of assets in which Brazil is a major player.
Raw sugar for October ended unchanged at 17.25 cents a pound.
While the return of prices above the key level of 17.00 cents a pound has encouraged hedge funds to close many short positions in sugar, "we are also seeing increased pricing activity and interest at these levels and scale up by producers, not all in Brazil," Sucden Financial noted.
"We suspect that unless [Brazilian Centre South] weather deteriorates further, producer selling may absorb further short-covering."
Chinese imports fall
And cotton, despite a vote of confidence from Societe Generale, lost some of its recent mojo, ending down 0.2% at 91.55 cents a pound, after customs data showed Chinese imports down 16.6% last month at 338,000 tonnes.
Shipments for the first seven months of 2013 have fallen 21% to 2.75m tonnes.