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What did Jan Baptista van Helmont's five-year willow tree investigation demonstrate ?
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What did Jan Baptista van Helmont's five-year willow tree investigation demonstrate ?

User Witek
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He discovered that the willow tree weighed about 74 kg more than it did at the start after five years. This made him conclude that plant growth cannot only be due to minerals from the soil.

User Miroslav Hrivik
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