Grain futures fell on the Chicago Board of Trade last week with more uncertainty waiting in the wings.

Weather, supply pressures weigh on grains
Weather, geopolitical risk provide support
U.S. officials are expected to propose biofuel blending requirements below industry recommendations
Report unlikely to have notable changes
Other crop prices firmer, stronger
Expected to rise mid-May to mid-June
Planting, growing progress pressuring prices
Demand for U.S. corn, planted acres could change
Trump a wildcard