000			01915nab a22002897a 4500
001			G90170
003			MX-TxCIM
005			20211006073021.0
008			121211b |||p||p||||||| |z||| |
040			_aMX-TxCIM
090			_aREP-12966
100	1		_aCassman, K.G. _92458
245	0	0	_aMeeting cereal demand while protecting natural resources and improving environmental quality
260			_c2003
340			_aComputer File|Printed
520			_aAgriculture is a resource-intensive enterprise. The manner in which food production systems utilize resources has a large influence on environmental quality. To evaluate prospects for conserving natural resources while meeting increased demand for cereals, we interpret recent trends and future trajectories in crop yields, land and nitrogen fertilizer use, carbon sequestration, and greenhouse gas emissions to identify key issues and challenges. Based on this assessment, we conclude that avoiding expansion of cultivation into natural ecosystems, increased nitrogen use efficiency, and improved soil quality are pivotal components of a sustainable agriculture that meets human needs and protects natural resources. To achieve this outcome will depend on raising the yield potential and closing existing yield gaps of the major cereal crops to avoid yield stagnation in some of the world's most productive systems. Recent trends suggest, however, that increasing crop yield potential is a formidable scientific challenge that has proven to be an elusive goal.
546			_aEnglish
650	1	0	_acarbon sequestration _91953
650	1	0	_aNitrogen use efficiency
650	1	0	_ayield potential
650	1	7	_aFood security _gAGROVOC _2 _91118
700	1		_aDobermann, A., _ecoaut.
700	1		_aWalters, D.T., _ecoaut.
700	1		_aYang Haishun, _ecoaut.
773	0		_tAnnual Review of Environment and Resources _n634943 _gv. 28, p. 315-358
942			_cJA _2ddc
999			_c26889 _d26889