Table 1. Production increases from closing yield gaps.

Crop	% of production in 2000
	References		R12	I14
	M12 [3]	SPAM
Maize	64	77	61–65	111–114
Soybean	25	44	32–33	68–70
Rice	47	77	44–47	113–124
Wheat	71	92	89–93	142–149