The article below suggests that the recent news to test rice for radioactivity came as a shock to the nation. If so, the Agriculture, Forestry and Fisheries Ministry will have been spared the shock as they were already anticipating this in May: Experiment to decontaminate farmland begins in Fukushima I have not seen any follow-up reports on the results of this experiment. Inquiring minds would like to know.

News that local governments around Japan will test rice for radioactive caesium came as a blow that rocked the nation’s collective psyche, threatening to make its beloved traditional staple the latest in a long list of forbidden foods.

Announcement of the testing last week came amid public fears over radiation in food in the wake of the world’s worst nuclear crisis in 25 years at the Fukushima plant in northeastern Japan, with excessive levels of radiation found in beef, vegetables, tea, milk, seafood and water.

via Japan rice worries a blow to collective psyche | Reuters.

And from the Breitbart May 28th article:

The farm ministry and the prefectural government have secured 3 hectares of rice paddies, vegetable fields and grassland for the program in which they plant sunflowers and amaranths in the fields to see their capabilities for absorbing radioactive cesium in the soil, they said.

In the paddies, they will use a mineral called zeolite to see its effect in absorbing cesium in mud, they said.