A - Papers appearing in refereed journals
Zhang, C., Ju, X., Powlson, D. S., Oenema, O. and Smith, P. 2019. Nitrogen Surplus Benchmarks for Controlling N Pollution in the Main Cropping Systems of China. Environmental Science & Technology. 53 (12), pp. 6678 - 6687.
|Authors||Zhang, C., Ju, X., Powlson, D. S., Oenema, O. and Smith, P.|
Nitrogen (N) surplus is a useful indicator for improving agricultural N management and controlling N pollution. Few studies have developed benchmark values for cropping systems in China, a country with the largest N fertilizer use in the world. We established N surplus benchmarks for 13 main cropping systems, at optimal N management, using results from >4500 on-farm field experiments and a soil surface balance approach. These cropping systems accounted for about 50% of total N fertilizer consumption in Chinese agriculture in 2009. The results showed that N surplus benchmarks for single cropping systems ranged from 40 to 100 kg N ha–1 yr–1 (average 73 kg N ha–1 yr–1), and for double cropping systems from 110 to 190 kg N ha–1 yr–1 (average 160 kg N ha–1 yr–1), roughly twice that of single cropping systems. These N surplus benchmarks may be further refined, following further decreases in N deposition rates and reactive N losses as a result of strict implementation of “4R-nutrient stewardship” and improvements in fertilization techniques and agronomic managements. Our N surplus benchmarks could serve as realistic targets to improve the N management of current conventional practices, and thereby could lay the foundations for a more sustainable N management in China.
|Year of Publication||2019|
|Journal||Environmental Science & Technology|
|Journal citation||53 (12), pp. 6678 - 6687|
|Digital Object Identifier (DOI)||doi:10.1021/acs.est8b06383|
|Open access||Published as non-open access|
|Online||24 May 2019|
|Publication process dates|
|Accepted||24 May 2019|
|Copyright license||Publisher copyright|
|Publisher||American Chemical Society (ACS)|
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