I face problems shown in the photo.
1- light green between the paper root
2- distortion paper in some plants
I am from Saudi arabia
Well, that explains the powder - what about the whitening on the veins of the leaf? And could you tell me what you mean by the "paper root" and "distortion paper?" I don't understand what you're seeing. If you can tell me where you're located, I can probably help you locate the gardening assistance in your area.
many thanks for your information
the powder shown in the photo is from the micron sulfur so i think it is not powdery-mildew
i think it is some of neutrent needed but i don't know what
The most likely problem is powdery mildew, although zucchini do often get natural white blotching on the leaves around the vein; these are a genetic trait, and it's thought they might be useful in repelling aphids. Rub the leaves with you fingers - fi the white stuff rubs off, it's probably powdery mildew. If it doesn't rub off, it's probably the natural silvering. Leaf distortion could be caused by powdery mildew, or by some cultural shortcomings. This article goes over the growing of zucchini: https://www.gardeningknowhow.com/edible/vegetables/zucchini/growing-zucchini.htm
This article has some advice on controlling powdery mildew: https://www.gardeningknowhow.com/plant-problems/disease/get-the-cure-for-powdery-mildew.htm