The left column in the Crop-Matron GUI are the Fertilizer slots; Fertilizer goes there. The center column in the GUI is the Hydration Cell column; Hydration Cells go in these slots. Lastly, the slots on the right is the Weed-EX column; Weed-EX canisters are placed there.
While operating, the Crop-Matron will use approximately 1 EU per tick. The Crop-Matron's internal battery can hold 900 EU.
In older versions, the Crop-Matron could only handle Low Voltage Energy by default; any more than 32 EU per tick would cause the machine to explode violently. However, Experimental changes make the machine not longer react in such a way.
Any material for the Hydration Cell slots needs to come from the top of the Crop-Matron, while anything for the Weed-EX slots should come from the bottom. Anything for the Fertilizer slots can come from the sides of the machine.