It really sounds like your basic problem is you have proceeded with investing time and money in a growing operation without knowing nearly enough about what is involved beforehand. Have you read the directions on the fertilizer containers? Strictly speaking the most effective fertilization depends on multiple variables including what minerals are in the irrigation water.

Shade cloth or lath is secured by use of supporting structures. If it is so windy the cloth tears away maybe you need to install fencing and or hedges to have a satisfactory growing and working environment anyway.

And so on.

There is a book on the subject from a pioneer in the field.

Here is a link that might be useful: Plant Production in Containers II

I forgot to mention that I am newbie grower. My father has been running nursery for over 15 years. He grows his stuff ,I intend to grow mine and even tho he doesn't like it, I plan to do it different way. I bought a lot of books (practical woody plant propagation for nursery growers by Bruce Macdonald, So you want to start a nursery and some others and yet none of them answers any of my question (except shading - partly). Multicote 6M has been recommended to me but I couldn't find anywhere what amount of it should be used for 2 litre, 3 litre and 4 litre containers. Whether its ok to cover top dressed CRF fertilizer by juta mulch sheets and what is maximum size of trees in containers (moment, when I have to either replant it to bigger one or discard it). The thing is, dad is growing arborvitae, juniperus and chamaecyparis. I want to grow different species but I want to try different approach as I won't be able to afford employees. That's why I prefer CRF fertilizer to liquid one (fertilizing only once a season), why I prefer bigger containers with juta mulch so I don't have to weed as much etc... Dad has given me space, water, electricity but other than that I'm on my own (financially and labor-wise).

Paul, my father and younger brother have a nursery and would not use anything but Osmocote Plus. It is not owned by Scotts anymore. If you go to the site, they have very detailed information as to how much to use, how long the release is at various temperatures, etc. I just bought a 50 pound bag for my home garden - $90.
Check here for an example of the kind of info they provide for their products: http://everris.us.com/sites/default/files/PS_903226_Eng.pdf