Heavy side: Water systems

Here is a few questions I have about water systems.

1.  What size of PVC pipe will carry enough water to supply 7 sprinklers?
2.  How big a pump do I need to push the water for those 7 sprinklers?
3.  What variety of sprinklers works best, and won't clog up with fertilizer?
4.  How many of us use heated water?

Thanks guys,
Brett   The Pumpkinguru
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