September corn futures are currently trading at $3.80 a bushel while the spot price of corn is $3.65 a bushel,so the "basis" (the futures price minus the spot price)is $0.15 a bushel.If you expect the basis to weaken (i.e. ,to fall)significantly in the next few days,you can speculate on your view by

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Going long spot corn and short September futures is the best choice if you expect the basis to weaken significantly in the next few days. This is because if the basis falls as anticipated, the spot price will decrease in relation to the futures price. By being long spot corn and short September futures, you would benefit from the decrease in the basis, as the spot price would decrease more than the futures price. This trade would allow you to profit from the expected decrease in the basis.

September Corn Futures Are Currently Trading at $3