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In every year of the experiment, plants treated with the nitrogen fertilizer had a yield of at least 30 pounds per acre.
In every year of the experiment, plants treated with the nitrogen fertilizer had a greater yield than did plants treated with the control fertilizer.
The 2018 yield for plants treated with the control fertilizer was greater than was the 2019 yield for plants treated with the nitrogen fertilizer.
The yield for plants treated with the nitrogen fertilizer increased from 2017 to 2018.