Sugarbeets would probably be the best for easy usage in non-tropical areas. I would think most sweet crops would beat corn though, corn by itself isn't that eff

Sugarbeets would probably be the best for easy usage in non-tropical areas. I would think most sweet crops would beat corn though, corn by itself isn't that efficient because of how much energy goes into growing the stalk. But it is one of the most robust with a huge range of soils and climates which lends to its prevalence