Each item in Minecraft has a unique ID assigned to it, known as an item ID, this can be used in commands to spawn the item into the game. The item ID for splash slow falling potion (1:30) in Minecraft is shown below:
The Splash Slow Falling Potion (1:30) item can be spawned in Minecraft with the below command. Cheats must be enabled before this will work.
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This splash potion will give players within proximity of its splash the Slow Falling potion effect for 1 minute 30 seconds, which, as you might have already guessed, makes those under its effects fall slowly (as-if gravity has a lesser effect). They will also not take fall damage and be unable to break crops by jumping on them.