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Strange craks in leafs

Thread starter #1
Hi, anyone could help me to indentify why have some cracks on some leafs
Here are some pictures:

Any help is welcome
What is your relative humidity?
Thread starter #4
Hi, humidity is not yet controled because this is a experimental process.
But cracks in leafs are related to low moisture in the air?

I was spraying water to plant leafs frequently, can wet-dry repetitive cause this?

That does sound reasonable, but I do not know the answer for sure.