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Cutting environmental footprints of maize systems in China through Nutrient Expert management

文献类型： 外文期刊

作者： Huang, Shaohui 1 ; Ding, Wencheng 1 ; Jia, Liangliang 2 ; Hou, Yunpeng 3 ; Zhang, Jiajia 1 ; Xu, Xinpeng 1 ; Xu, Rui 1 ;

作者机构： 1.Chinese Acad Agr Sci CAAS, Inst Agr Resources & Reg Planning, Key Lab Plant Nutr & Fertilizer, Minist Agr, Beijing 100081, Peoples R China

2.Hebei Acad Agr & Forestry Sci, Hebei Fertilizer Technol Innovat Ctr, Inst Agr Resources & Environm, Shijiazhuang 050051, Hebei, Peoples R China

3.Jilin Acad Agr Sci, Changchun 130124, Jilin, Peoples R China

4.Univ Okara, Dept Biol, Okara 56130, Pakistan

关键词： Maize; Reactive nitrogen loss; Greenhouse gas emissions; Environmental footprints; Nutrient expert

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：6.789； 五年影响因子：6.914 ）

ISSN： 0301-4797

年卷期： 2021 年 282 卷

页码：

收录情况： SCI

摘要： Excessive fertilizer consumption, poor management, and intense pollution currently restrict sustainable agriculture in China. To address these problems, two 9-year experiments involving typical maize production systems in Northcentral China (summer maize) and Northeast China (spring maize) were conducted to evaluate the effectiveness of Nutrient Expert (NE) management, a Nutrient Decision Support System which combines 4 R nutrient management with improved varieties and optimized plant density, on reducing carbon (C) and nitrogen (N) footprints. The mean grain yields under NE were 7.4 and 11.5 tons ha(-1), which were 3.9% and 6.9% higher than those of local farmers' practices (FP) in the summer and spring maize systems, respectively; the N-derived (affected by N fertilization) yield accounted for 21.7% and 73.5% of the total yield under NE, respectively. Compared with FP, NE achieved 21.8% and 16.0% lower reactive nitrogen (Nr) losses, 18.4% and 20.9% lower greenhouse gas (GHG) emissions, 24.8% and 21.4% smaller N footprints (9.1 and 2.3 kg N ton(-1) grain), and 21.5% and 26.0% smaller C footprints (436 and 206 kg CO2 eq ton(-1) grain) in summer and spring maize, respectively. NE reduced the N-derived N and C footprints by 30.3% and 27.2% in summer maize and 22.9% and 28.0% in spring maize, respectively, as a result of greater yields and optimal N management. Moreover, compared with summer maize, spring maize showed significantly smaller N-derived N (12.6-fold) and C (7.2-fold) footprints. The results demonstrated the ability of long-term NE management to sustain maize yields, reduce Nr losses and GHG emissions, and cut C and N footprints, indicating its potential suitability as an alternative management for sustainable agriculture. Moreover, the summer maize system still had considerable potential for environmental footprints reduction even when current NE management practices were adopted.

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