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What is the independent variable in this problem?

Rony wanted to find out how the amount of fertilizer affects the growth of plants. He placed three tomato plants in 10-inch pots with potting soil added with varying amount of fertilizer. The first pot was added with 0 g fertilizer, the second pot was added with 25 g fertilizer, and the third pot was added with 50 g fertilizer. All pots were watered / cup each day and were placed under the sunlight. He measured the growth of each plants for three weeks.

Warning:Nonsense reported
pls..help me​