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Originally Posted by rockm
That's sun scortch, not soil problems. Direct sun will do this. Hot roots add to the problem, especially if nighttime temperatures don't get much below 70 F.
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Leal scorch or tip burn have exactly the same physiological causes :
1 -Direct sun on the leaves can make them transpire more if the roots cannot supply the needed amount of water to prevent the tissues from dying.
2 - Too much salt concentration in the soil, or not enough feeder roots to absorb the required amount of water needed by the leaves, will also cause the same dying of leaf tissue.
If it was only a problem of direct sun, the seedlings that are in the ground in the same hot house will also have leaf scorch.