The hoe in TFC has seen an extensive upgrade from minecraft. Aside from tilling soil for agriculture, the hoe has several modes which provide additional information regarding soil properties.
By pressing M, the different modes of the hoe can by cycled through, as indicated by a small symbol on the right of the hotbar. These modes show if the block is watered and if the crop is ready to harvest. Additionally, a metal hoe can show nutrient levels in the soil once agriculture skill reaches "expert" level.
To make a Hoe you first need a Hoe head. Hoe heads are acquired through Knapping rocks, smelting metal into a ceramic mold, or smithing one at an anvil. Once the head has been made, place it in the crafting box with a stick beneath to create a hoe (alternately, bones may be used instead of sticks).