Yes, this works. This is already made, but I made my own version with deferent redstone circuits and controls. If you wanna learn to make this, then click me

How it works is that the despensers shots boon meal at the soil which we all know what it does. Then the pistons pulls the dirt down to break the food so we can gather the food. The cart goes side to side and when it runs over the tripwire, the piston pulls the dirt down. But agian, I did not came up with 80% of this, I just changed up the buttons and wireing.