Add fallowing to Minecraft

Fallowing is the act of leaving arable land without crops so it can rest. This would restore soil fertility.

How I imagine it to be in Minecraft: if you leave farmland without sowing seeds for 1 or more days, it will turn 'extra fertile' (STC), you can see if it is 'extra fertile' through green particles that periodically come off. 

The next time you sow seeds there they will either grow twice as fast or grow into abundant crops (abundant crops drop double the normal amount).

Fallow land is also known as habitat for certain birds, so maybe make it so that chickens like to walk around there and lay eggs quicker