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"I want to know how much vegetables can be grown in a single net house without disturbing other crops' quality (in terms of cross pollination/pest attacks)."

Are you assuming a greater variety of crops will cause more problems in this regard? The opposite is in fact possible. If you plant a whole field of one crop, and a problem starts in one corner, what is their to stop it spreading (other than you)? In contrast using multiple crops, if you select them carefully, different crops can be used as barriers (like a fence or hedge) to other crop's pests.

Also greater plant diversity would tend to lead to a greater diversity of pollination vectors. But a cautionary note, careful research into how to maximize the beneficial effects of crop diversity is very helpful, else you might get it wrong. Crop diversity can be beneficial, but isn't necessarily so.