1/20/2021 SINGAPORE, Jan 21 (Reuters) - Chicago soybeans ticked higher on Thursday, having slid for the last three sessions on pressure from technical selling and rains across South America easing supply worries. Wheat and corn prices gained ground with additional support from broad-based gains in world markets, lifted by expectations that newly inaugurated U.S. President Joe Biden would put in place further economic stimulus. FUNDAMENTALS * The Chicago Board of Trade (CBOT) most-active soybean contract added 0.7% to $13.79 a bushel, as of 0112 GMT. The market dropped to its lowest since Jan. 8 at $13.52 a bushel in the last session. * Wheat rose 0.5% to $6.70-3/4 a bushel and corn