Some water is pulled down (along with the half of the fertilizer that's actually used), the rest is literally washed away because the soil can't absorb the amou

Some water is pulled down (along with the half of the fertilizer that's actually used), the rest is literally washed away because the soil can't absorb the amount of water being dropped on it. All the water that's flowing over the ground ends up in rivers (it's the reason they exist in the first place).