Planted acres usually shift amongst crops but they do not typically go completely fallow, at least not to the scale in today’s USDA acreage report. Some shorts got caught with their pants down and took a beating today. The question is why farmers decided to let 6 million acres go idle compared to what they reported in March? There are several possible reasons but two are notable: 

On-farm stocks of wheat, corn and soybeans are higher (see graph below); and

Planting crops is not profitable for many farmers.

Chances are, it is more marginal land that is being idled and so the impact on overall production will be somewhat muted. Speculators can be mad at USDA but the agency had to weigh what farmers reported back i...