i have searched for this...and cant find it...any input

i have many seeds in little red cups, a few have popped above ground. After a week or so, when i see which ones arent going to penetrate the soil, im going to get rid of them, and move the survivors into bigger pots, or in-ground holes which i have already dug. My question is: I have basic potting soil in the cups now, and i have a mix of humus, garden soil and perlite in the ground holes. Can i transplant the seedlings from the cups into the ground with the new type of soil - or will it shock them somehow? The soil is pretty good quality, i mixed a few good elements, but i was jus thinking that entering a new soil will stress the plants. should this be a worry...or not? again, i have tried to find the answer to this but have been unsuccessful. thanks

 

Transplanting 101
Water the plants in the cups with water to which you have added horticultural vitamin B-1 (NOT human B-1) or Superthrive or Thrive Alive.
Using the cup as a guide, dig a hole where you want to transplant the same size as the cup.
Turn the cup on it's side and gently squeeze the sides. Hopefully the entire contents will slide out in 1 piece. Guide it into the hole.
The plant should be a bit deeper in the new location. I transplant so that the cotyledons (those first 2 oval leaves) are at soil level.
The next time you water use the additive mentioned above. B-1 encourages root growth among other things.