4/15/2021 SINGAPORE, April 16 (Reuters) - Chicago corn futures traded little changed on Friday but were on track for a third straight weekly gain as adverse U.S. weather and strong global demand raised concerns over supplies. Soybeans were on track for their biggest weekly gain in more than a month, while wheat was up for a second week in a row. FUNDAMENTALS * The most-active corn contract on the Chicago Board of Trade (CBOT) has gained 2.3% so far this week. The market was trading quarter a cent higher at $5.90-1/4 a bushel, as of 0110 GMT. * Soybeans have added 1.3% this week, while wheat