WASHINGTON — Vernon Hugh Bowman seems comfortable with the old way of doing things, right down to the rotary-dial telephone he said he was using in a conference call with reporters. But the 75-year-old Indiana farmer figured out a way to benefit from a high-technology product — soybeans that are resistant to weed-killers — without always paying the high price that such genetically engineered seeds typically bring. In so doing, he ignited a legal fight with seed-giant Monsanto Co. that has now come before the Supreme Court, with arguments taking place Tuesday.