# Main Effects of Water Stress and Sulphur Dioxide

Let’s learn about the details of the main effects of water stress and sulphur dioxide in this lesson.

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## Main effects of water and sulphur

The ANOVA table confirms the lack of any indication of an interaction, but the F-tests for the main effects of water stress and sulphur dioxide now support the main effects of these variables, according to the *p < 0.05* convention. This is even in the presence of an non-significant interaction. Earlier, we saw that for the one-way ANOVA of Darwin’s maize data, the ANOVA table F-tests and the summary table t-tests produced identical p-values. But things are different for this ANOVA—while the *p-value* for the interaction is the same in both tables, the tests for the upper two rows disagree.

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