Irrigation is a Theme: Movie.

In the race of finding the right chemical compound to enhance field productivity, not every compromise is going to work:
Set in a dystopian world, Idiocracy is a 2006 American satirical science fiction comedy film directed by Mike Judge.
It is the story of two "average Americans", who find themselves in an unlikely future where the standard IQ has lowered so much that they suddenly become considered as the most intelligent persons on the earth. For this reason, they are requested to solve a drought situation in the USA country.
That is when they realise that, instead of water, crops are being irrigated with energetic beverages.

Here is the scene just described.