Unless you plan on pumping a lot of water, using a tractor PTO to drive the pump is not very efficient. A 5 HP pump can put out a lot of water using 1 1/2" PVC pipe. Lowes sells 1 1/2" PVC pipe for $38/100'. You can expect 20-25 gpm with 1 1/2" PVC before you see any sufficient pressure drop. Most sprinklers only put out 6 gpm. If you need a high pressure pump, the IPT pump carried by Northern Tool is hard to beat at 70 psi output. They also carry a two-stage pump made in Australia that has 125 psi output.
First you should calculate on paper the number of sprinklers that you plan to run, length of pipe and pressure drop, uphill pressure drop and the time required to cover the area with 1" of water. Then you will see the economics of your system plus save gas and maybe wear and tear on your tractor.

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