Do transparencies gradients in corel 10 need blur & noise added for offset printing?

I have a solid green color which I have faded to 0 by transparency, appx 7 inches wide by 3/8 inch height. It sits on top of a rectangle with a tint of the same color.
Also same question for gradients . I'm fading to the white of the paper.

If you do what's a good starting point for adding blur & noise.

I can not figure out even one use for the knife tool leave as one object. It is a big puzzlement. I know I must be missing something. Is there some good ways to use it?

Thanks.
Cheryl