What is wrong with my plants?!?!?!

i am currently growing about 70 seedlings in rockwool cubes untill i buy some pots to transplant them to, for a while they were growing nice and green, but fairly slow, at first i thought i was overwatering but now i think i might be underwatering, some of the plants around the edges are growing the same they were before but alot of the plants in the middle their leaves have shriveled up, turned brown, and are crispy, they are in a field with no trees around and they get light all day long can someone please help me as to what i should do so i dont loose these baby's?
here are some pictures of some of the healthy plants, some of the unhealthy plants, and the tray i have them in, in the field

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Wow. Geez. That sucks, dude.

Um, what's the weather like? Also, how old are the plants?

yo man im not the best of growers i jus started my-self but i think they are stunted they got to be transplanted already!

rockwool has NO nutes in it does it? .. so get them in some soil!

the sooner you get them into well prepared soil the better your chance your plants have of surviving, my tip, as soon as u read this run outside and transplant ya babies, oh and dont forget when ya transplant give them a quarter dose of fertilizer and a lot of water, preferrebly in the arvo or in the morn so they dont get to much of a shock

transplant them they probally want more room..
now there shows dont fit no more lol

or its too hot keep your eyeys on em