Cotton Farming

I'm not sure if this is in the right section, but here goes. Anyways, I need an automatic cotton farm. That's fast. Alright, so this is what I have so far. I tried using a harvester with a fertilizer that's about 15x15. It's very fast, but it seems too hard to support considering the power input and the amount of fertilizer it takes. So, I resorted to using Turtles to place bonemeal on a 3x3 grid of cotton seeds and have a harvester with no upgrades to clean up the mess.

Here's the issue....

Cotton Farming