I've set up an auto harvesting farm for everyone to use. It is really easy and allows you to collect 47 wheat in one go. You can get there by doing /home gundog48, and it's safe BTW 
Really simple to use. All you have to do is look in the chest and grab some seeds and bonemeal. Then simply sow the tilled area in the recessed parts and then 'ripen' them with bonemeal. Once that is done, flick the lever and the floodgates will open, make sure all the loot has washed to the end of each channel before closing them. Then simply go down the ladder in one of the corners and collect everything. Put at least 47 seeds back in the chest then go make some bread!
I would prefer it if you wouldn't replant after harvesting as the chances are some cow will decide to fall in there and mess it up, there is also a hoe in the chest if that does happen.
When the colosseum is finished I may improve it to double the capacity by mirroring it. It is hard to simply add another channel as it can only go as far as the water can reach. Anyway, enjoy!

Really simple to use. All you have to do is look in the chest and grab some seeds and bonemeal. Then simply sow the tilled area in the recessed parts and then 'ripen' them with bonemeal. Once that is done, flick the lever and the floodgates will open, make sure all the loot has washed to the end of each channel before closing them. Then simply go down the ladder in one of the corners and collect everything. Put at least 47 seeds back in the chest then go make some bread!
I would prefer it if you wouldn't replant after harvesting as the chances are some cow will decide to fall in there and mess it up, there is also a hoe in the chest if that does happen.
When the colosseum is finished I may improve it to double the capacity by mirroring it. It is hard to simply add another channel as it can only go as far as the water can reach. Anyway, enjoy!