Deborah Koons Garcia did not make a film about dirt. Dirt is hard, compact, dead. Her most recent documentary, Symphony of the Soil, exalts in the invisibly teeming, wildly variant underdog of the environmental and organic food movements. Soil, through Ms. Koons Garcia’s lens, is the hero.

The 104-minute documentary screens at 7 p.m. Saturday at the . . .

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