It is G-20 week in Buenos Aires, and the highly-anticipated side meeting between U.S. President Trump and Chinese President Xi slated for 30 November is center stage as far as agricultural markets are concerned. U.S. soybean producers desperately hope it will lead quickly to some sort of an agreement that results in China lifting the 25 percent tariff on U.S. soybean imports implemented last July. That tariff has created a de facto embargo on fresh U.S. soybean sales to China along with cancellations of those previously made but unshipped. It was imposed as U.S. farmers were in the midst of growing what appears to be a record soybean crop. As a result, soybean futures prices have fallen more than $1.50/bushel since May, and cash soybean bas...