(Dow Jones) -- US farmers are gearing up for the spring planting season, but some are now scrambling to rethink plans after China announced potential 25% tariffs on US soybeans. Less than two weeks out from planting on his 2,000 acre farm, Illinois farmer Aaron Wernz said a sharp drop in soybean prices and concerns that the tariffs would slash US exports of the oilseeds would likely prompt him to sow more corn -- and less soybeans -- than originally intended. He'll also take a harder look at future seed and fertilizer purchases if crop prices remain depressed, he said. "I probably just lost $50,000," said Wernz.