Associated Press: Some of the nation’s largest farms plan to cut back on planting crops this spring over concerns that the drought plaguing California will cause federal water supplies to dry up. Farmers in the Central Valley said they would forego planting thousands of acres of canning tomatoes and already have started slashing acreage for lettuce and melons. As growers in Fresno and Kings counties prepared to sow their dry fields with tomato seeds this week, the giant water district that …