Well, ya got me there. I THOUGHT there were some HUGE cotton and rice farms in California. There USED to be.
By the way the "central valley" extends HUNDREDS of miles north/south, all the way from the American-Mexican border to Sacramento, (120 miles of so north of San Francisco). That is one big valley.
True, the ones I knew were up near Lindsey, Visalia, and Porterville. Grapes, Oranges, and Olives. And none of them are huge compared to the plains states where the average farm is about 2000 acres.