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The 3 main nutrients are N, P, K. Fertilizer nutrients are natural and come from the earth.
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An experiment that has students stretch hosiery over the rim of a baby food jar and after adding soil and grass seeds. Students create Soil Sammy – the grass becomes hair. Older students can experiment with fertilizer, soil types and water balance.
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Print and post this colourful poster to help illustrate the importance of replacing soil nutrients after each harvest.
