I successfully kept hogs out of disked & planted ground for years. Winter oats, summer haygrazer.
Hog sounders in my area were typically 30-50 pigs.
Buy a High Joule electric charger, at least 12 joules.
I recommend Cyclops made in USA.
Expensive, but they work.
Avoid chargers at TSC, CooP etc, those are 3 Joules and are for domesticated livestock.
Use Gallagher braided string with wire. Two strands 12 & 24 inches. Wire strand works, string-wire is easier.
Get a dedicated copper ground rod at least 4 foot long and keep the soil wet. About a 5 gallon bucket of water once a week in this drought.
You can tee post the corners and use step in plastic posts inbetween. Gallagher make easy to use Tposts insulators.
Also get a Gallagher clip on flashing light that blinks on charger pulses, lets you know fence is on.
Avoid inexpensive chargers. Also some chargers (Gallagher solar) ramp back output at night when Livestock sleep. Thus get a Cyclops.
Warning the high joule chargers really hurt if you touch a live wire , much worse than a standard chargers.
Shooting them doesn't stop the sounder from coming back. I killed them weekly.
The baseball net mesh circle traps that they push under really work the best. Common to catch 30 or more at a time
Our county Soil Conservation District bought two to lend out.
Poison works and it just got approved last year. Need training to buy it.
Good luck !
https://cyclopsfence.com/?srsltid=AfmBOoqbKqaKmCXfCRn85NozRe_k4W2wHGbTMOJoqNhtHqPJhYm0-_Xgsrsltid=AfmBOoqbKqaKmCXfCRn85NozRe_k4W2wHGbTMOJoqNhtHqPJhYm0-_Xg