000			01977nab a22003137a 4500
001			G96975
003			MX-TxCIM
005			20211006074519.0
008			121211b |||p||p||||||| |z||| |
024	8		_ahttps://doi.org/10.1146/annurev.environ.041008.093740
040			_aMX-TxCIM
041	0		_aEn
100	1		_aLobell, D.B.
245	0	0	_aCrop yield gaps: _b their importance, magnitudes, and causes
260			_c2009
520			_aFuture trajectories of food prices, food security, and cropland expansion are closely linked to future average crop yields in the major agricultural regions of the world. Because the maximum possible yields achieved in farmers' fields might level off or even decline in many regions over the next few decades, reducing the gap between average and potential yields is critical. In most major irrigated wheat, rice, and maize systems, yields appear to be at or near 80% of yield potential, with no evidence for yields having exceeded this threshold to date. A fundamental constraint in these systems appears to be uncertainty in growing season weather; thus tools to address this uncertainty would likely reduce gaps. Otherwise, short-term prospects for yield gains in irrigated agriculture appear grim without increased yield potential. Average yields in rainfed systems are commonly 50% or less of yield potential, suggesting ample room for improvement, though estimation of yield gaps for rainfed regions is subject to more errors than for irrigated regions. Several priorities for future research are identified.
546			_aEnglish
593			_aCarelia Juarez
595			_aRPC
650	1	7	_aAgriculture _gAGROVOC _2 _91007
650	1	0	_aClimate uncertainty
650	1	0	_aFood production _91116
650	1	0	_aYield constraints
650	1	0	_ayield potential
700	1		_aCassman, K.G., _ecoaut. _92458
700	1		_aField, C.B., _ecoaut.
773	0		_tAnnual Review of Environmental Resources _gv. 34, p. 179-204
942			_cJA
999			_c29385 _d29385