土豆也是粮食的一种, 按照美国农民的产量, 最高亩产已经达到 4562 kg。不清楚这个亩产量是一季的, 还是一年多季产量的总和。如果是一季的产量, 那全年的产量就远超万斤粮。如果是全年的产量, 离亩产万斤粮也不远。
61000 lb/acre = 4562 kg/亩
1 acre = 6.07 亩
Farmers are harvesting between 24,500 and 61,000 pounds of potato per acre (State average). Some farmers may have much higher yields, and some much lower.
http://kenoshapotato.com/Potato_Production_USA.htm?