We shouldn't be sending free food to other countries anyway. Teach them to grow themselves. Help them with drilling wells. If we just keep feeding the world they'll never learn or have the desire to grow on there own.
We could grow just as much crops organically as we do now. Absolutely no reason we couldn't except we keep building strip malls on the best growing areas. A perfect example is here in Washington. Some of the best growing soil in the state is the Kent Valley. Stretches from Seattle to Puyallup. Its all be paved over and made into strip malls and parking lots.