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5 Sulfur (SO2) 0. There is no contact with air-based pollutants and no repugnant smell. The calcium content in oyster shell powder helps to balance soil pH levels Improves nitrate uptake Aids enzyme formation Strengthens plant cell walls Adding powdered oyster shells to your soil will make a big difference in your plants overall growth rates and vitality The coarse texture of oyster shells also helps to reduce compaction in the soil.