Region-specific nitrogen management indexes for sustainable cereal production in China
نویسندگان
چکیده
منابع مشابه
Synthetic nitrogen fertilizers deplete soil nitrogen: a global dilemma for sustainable cereal production.
Cereal production that now sustains a world population of more than 6.5 billion has tripled during the past 40 yr, concurrent with an increase from 12 to 104 Tg yr(-1) of synthetic N applied largely in ammoniacal fertilizers. These fertilizers have been managed as a cost-effective form of insurance against low yields, without regard to the inherent effect of mineral N in promoting microbial C u...
متن کاملImproving Nitrogen Use Efficiency for Cereal Production
found, had they considered N derived from the soil (Keeney, 1982; van der Ploeg et al., 1997). Using the Worldwide, nitrogen use efficiency (NUE) for cereal production same references and assumptions in Table 1, cereal (wheat, Triticum aestivum L.; corn, Zea mays L.; rice, Oryza sativa L. and O. glaberrima Steud.; barley, Hordeum vulgare L.; sorghum, NUEs are 42 and 29% in developed and develop...
متن کاملReply to Comments on “Synthetic Nitrogen Fertilizers Deplete Soil Nitrogen: A Global Dilemma for Sustainable Cereal Production,” by R.L. Mulvaney,
We appreciate the opportunity to respond to the comments of Dr. Powlson and his colleagues (Powlson et al., 2010) and to further elaborate a critical but often overlooked aspect of synthetic N fertilizer usage in response to the world’s growing demands for food, fi ber, and energy. Th e work reported by Khan et al. (2007a) and Mulvaney et al. (2009) was undertaken to evaluate how synthetic N fe...
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Three selection indexes for the UK hill sheep sector are derived to suit the extremes of hill production systems. These are: (i) intensive, where all surplus lambs not required for breeding are finished for slaughter, (ii) extensive, where all surplus ‘store’ lambs are sold to other farmers for finishing, and (iii) semi-intensive, which is intermediate between the two extremes, i.e. farms finis...
متن کاملA tradeoff frontier for global nitrogen use and cereal production
Nitrogen fertilizer use across the world’s croplands enables high-yielding agricultural production, but does so at considerable environmental cost. Imbalances between nitrogen applied and nitrogen used by crops contributes to excess nitrogen in the environment, with negative consequences for water quality, air quality, and climate change. Here we utilize crop input-yield models to investigate h...
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ژورنال
عنوان ژورنال: Environmental Research Communications
سال: 2020
ISSN: 2515-7620
DOI: 10.1088/2515-7620/aba12d