You have calculated a p-value for your ANOVA test. Now what?
If you found a significant result, you still need to determine which treatments were different from which.
You can gain insight by looking back at your plots (boxplot, mean ± s).
There are several tests of statistical significance designed specifically for multiple tests. You can choose apriori contrasts, or aposteriori multiple comparisons.
You can find the confidence interval for each mean i shown to be significantly different from the others.