* Soybeans up 5% for the month * Wheat falls, set to finish April up 19% By Colin Packham CANBERRA, April 30 (Reuters) - U.S. corn futures edged higher on Friday, as the grain was poised to post its biggest one-month gain in more than two years on global supply concerns. Soybeans were little changed, while wheat rose 0.5%. The most-active corn futures on the Chicago Board of Trade were up 0.2% at $6.49-3/4 a bushel by 0401 GMT, after closing up 0.7% lower on Thursday. Corn up 15% during April, the biggest monthly gain since May 2019. Corn hit a near 8-year high of $6.84 a bushel earlier in the week.