Eliminating yield gaps could increase crop productivity up to 70%, depending on the crop
“Globally, we find that closing yield gaps to 100% of attainable yields could increase worldwide crop production by 45% to 70%for most major crops (with 64%, 71% and 47% increases for maize, wheat and rice, respectively)”
Nathaniel D. Mueller et al., “Closing yield gaps through nutrient and water management,” Nature 490, no. 7419 (October 2012): 254-257, accessed June 16, 2014, doi:10.1038/nature11420