Interestingly enough Food and Agriculture Organization of the UN supports Michael's argumentson wheat. On rice we do seem to have yield above world average and most areas though we are not at the very top. On corn we seem to be surpassed by only a very few nations. (source links below table)
| World| U.S. | Asia (Developed)| Industrialized| EU, Wheat | 29,065 | 29,029| 36,242 | 36,082
| 58,537 rice |40,038 |77,808 |64,150 |70,09
| 67,485 Corn |49,066 |100,650 |158,263 |93,112
| 83,556
wheat:http://tinyurl.com/9n5ky rice: http://tinyurl.com/bqfeo corn: http://tinyurl.com/b447w
The exceptions who surpass us in rice
Australia 82,308 Egypt 96,850 Honduras 83,650
Bottom line we are productive - but not unmatched. And we could be just as produtive, per acre and per person hour with a lot fewer deadly inputs.
The exceptions who surpass us in corn (including developed Asia) Belgium 122,246 Chile 110,678 Israel 160,000 Kuwait 200,000 New Zealand 113,333 Qatar 125,926