I have always been under the impression that there is two differences between herb grown in soil versus herb that has been grown hydroponically. The first, is that hydro tends to produce a higher THC level. Second, that soil tends to have a better taste. The THC content I can imagine, perhaps due to the nutrient supply and what not. However, I have a hard time understanding how hydro effects taste. Taste is caused by terpenes, if I'm correct.

So my question is this:

In what way does hydroponics affect terpenes?