HONG KONG, May 22- China shares were headed for a sixth-straight daily gain on Wednesday, with most automakers strong after the official China Securities Journal cited an industrial association as saying that May car sales could stay strong.
*Hot weather last week stressed Kansas wheat. CHICAGO, May 21- Tornadoes, high winds, rain and hail that cut a swath across the midsection of the United States on Sunday and Monday did only minimal harm to the winter wheat crop in top producers Kansas and Oklahoma, agricultural experts said. I'm in Phillips County now, in northwest Kansas, and the crop looks terrible.