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
Thanks
 
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?

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