Optimum nitrogen rate to maintain sustainable potato production and improve nitrogen use efficiency at a regional scale
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(2020) 40:37
RESEARCH ARTICLE
Optimum nitrogen rate to maintain sustainable potato production and improve nitrogen use efficiency at a regional scale in China. A meta-analysis Chong Wang 1,2 & Huadong Zang 1 & Jiangang Liu 3 & Xiaoyu Shi 1,2 & Shuo Li 1,2 & Fu Chen 1,2 & Qingquan Chu 1,2 Accepted: 3 September 2020 # INRAE and Springer-Verlag France SAS, part of Springer Nature 2020
Abstract The great challenges of ensuring global food security and reducing environmental risk caused by excessive fertilizer inputs require optimizing fertilizer rates to maintain crop production and environmental sustainability. Previous results regarding optimizing Nfertilizer rate for potato were mainly based on case studies and lacked regional-scale information on N-fertilizer management. We hypothesized that regional optimum N rates would increase N use efficiency without sacrificing potato yield compared with low and high N rates. We determined the optimal N-fertilization rates for Chinese potato production at a regional scale based on a dataset of 706 observations from 142 peer-reviewed publications. The linear-plus-plateau model was used to estimate regional optimum N rates, which were 115, 150, 120, and 126 kg N ha−1 for the northern, central, southwestern, and southern regions of China, respectively. The target yield could be obtained by applying less N fertilizer when the indigenous N supply was higher across the main potato production region in China. Compared with high N rates, recommended N rates increased N use efficiency and agronomic efficiency by 48.60–81.67% and 17.12–72.90%, respectively, without any yield losses. Recommended N rates also achieved 5.95–14.70% greater yield than low N rates. Here, we show for the first time that, based on a comprehensive literature review, regional optimum N-fertilizer rates result in increased yield and N use efficiency, and reduced negative environmental impacts, all of which play a vital role in maintaining sustainable potato production. The present study highlights the importance of research for achieving a reasonable trade-off between food security and N-fertilizer management for sustainable agriculture. Keywords Recommended nitrogen rate . Nitrogen use efficiency . Yield . Indigenous nitrogen supply . Environmental sustainability
1 Introduction The world population is projected to reach 9 billion by the mid-twenty-first century (Godfray et al. 2010). Meeting the future food demand derived from the expansion in the population will require increasing yields without aggravating environmental risks or increasing cropland expansion. Potato (Solanum tuberosum L.) production may play an important * Qingquan Chu [email protected] 1
College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
2
Key Laboratory of Farming System, Ministry of Agriculture and Rural Affairs, Beijing 100193, China
3
The Institute of Vegetables and Flowers Chinese Academy of Agricultural Sciences, Beijing 100081, China
role in this context since it is the fourth most imp
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