Issue Description: Loamy farmland is causing an ArrayIndexOutofBounds Exception, causing anyone who loads the block to disconnect and be unable to reconnect without throwing the same error.

Steps to reproduce:

1. Till loamy farmland, attempt to plant seeds in farmland. I also have a MFR planter/harvester setup but I don't know if it is necessary to reproduce as this crashes my java and is hard to test.
2. Did not seem to cause issue at first, but immediately crashed when trying to load the chunk again.
3. Repeat until frustrated enough to make github post.

Additional Information:

• fml-client-latest.log or fml-server-latest.log: http://paste.feed-the-beast.com/view/6412a82b
• Screenshots:

Affected Versions (Exact numbers, do not use "latest"):

• Biomes O' Plenty: 1.7.10-2.1.0.1889-universal
• Minecraft: 1.7.10
• FTB Infinity 2.5.0 Pack

Please note, I am trying to replace the farmland with commands to at least make the server playable again, but another resolution to this would be great.

1.7.10 is no longer beeing worked on, so it's no longer supported.