Leaves curl and twist

Hi all,

This is my first post as newbie grower and I'm sorry if there is an aswer to this issue, I just couldn't find what I needed. I have issue with the leaves, which are curling, twisting, some of the tips are dry and strange white dots appeared. Other than that the plant looks healthy. I'm also checking for bugs every few days and there aren't any as far as I can see.

This is my third try to grow on natural light and this is the most I've succeed in three tries, because from where I come from, cannabis is still illegal and the access to strains, lamps, fans, ph measuring devices, humudity devices and nutritions is quite limited. Yet, I read and I try to learn how to grow, because I believe one day will be useful when it's legal.

For start, this is a random seed I picked up from a bud, don't know the strain, by the leaves looks like sativa or hybrid. I used natural ingredients as water and organic waste made out of dried cow shit. It is planted in March, at the moment it's in flowering stage. I've read a lot about the light hours, but as I mentioned because of limited resources, I use daylight and a natural wind flow, since my sorrounding has quite nice airflow. The weather is hot (35+ degrees Celsius) and dry this period here and the humidity is on average from 20-40%.

I attached some photos to make it easier to see and I would appreciate all hints and tips I could get, thank you all in advance.

Cheers!
 

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