Global direct nitrous oxide emissions from the bioenergy crop sugarcane (Saccharum spp. inter-specific hybrids)

Yang, Linsheng; Deng, Yan; Wang, Xiaozhong; Zhang, Wushuai; Shi, Xiaojun; Chen, Xinping; Lakshmanan, Prakash; Zhang, Fusuo

doi:10.1016/j.scitotenv.2020.141795

Cited by 48 publications

(24 citation statements)

References 63 publications

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“…Although the application of N fertilizer plays an important role in global food security, excessive nitrogen fertilizer use in agriculture production can also have negative environmental effects such as increased greenhouse gas (GHG) emissions [52,53], soil acidification [54], and eutrophication of groundwater [55]. Compared with the possible yield loss, the additional cost is tolerable with the relatively low nitrogen fertilizer price [56], which is the main reason for the excessive nitrogen input.…”

Section: Discussionmentioning

confidence: 99%

Projected Elevated [CO2] and Warming Result in Overestimation of SPAD-Based Rice Leaf Nitrogen Status for Nitrogen Management

et al. 2021

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Nitrogen (N) has a unique place in agricultural systems with large requirements. To achieve optimal nitrogen management that meets the needs of agricultural systems without causing potential environmental risks, it is of great significance to increase N use efficiency (NUE) in agricultural systems. A chlorophyll meter, for example, the SPAD-502, can provide a simple, nondestructive, and quick method for monitoring leaf N status and NUE. However, the SPAD-based crop leaf’s N status varies greatly due to environmental factors such as CO2 concentration ([CO2]) or temperature variations. In this study, we conducted [CO2] (ambient and enriched up to 500 μmol moL1) and temperature (ambient and increased by 1.5~2.0 °C) controlled experiments from 2015 to 2017 and in 2020 in two Free-Air CO2 Enrichment (FACE) sites. Leaf characters (SPAD readings, chlorophyll a + b, N content, etc.) of seven rice cultivars were measured in this four year experiment. Here, we provide evidence that SPAD readings are significantly linearly correlated with rice leaf chlorophyll a + b content (chl a + b) and N content, while the relationships are profoundly affected by elevated [CO2] and warming. Under elevated [CO2] treatment (E), the relationship between chl a + b content and N content remains unchanged, but SPAD readings and chl a + b content show a significant difference to those under ambient (A) treatment, which distorts the SPAD-based N monitoring. Under warming (T), and combined elevated [CO2] and warming (ET) treatments, both of the relationships between SPAD and leaf a + b content and between leaf a + b content and N content show a significant difference to those under A treatment. To deal with this issue under the background of global climate change dominated by warming and elevated [CO2] in the future, we need to increase the SPAD reading’s threshold value by at least 5% to adjust for applying N fertilizer within the rice cropping system by mid-century.

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Section: Discussionmentioning

confidence: 99%

Projected Elevated [CO2] and Warming Result in Overestimation of SPAD-Based Rice Leaf Nitrogen Status for Nitrogen Management

et al. 2021

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“…Farmers in the developing world tend to over-fertilize [20,21] because of the uncertain of variables such as weather and soil conditions. Management practices, based on the "fertilize for good years" rule, are consistent with maximizing expected returns under yield uncertainty, as the cost of over-application is less than the opportunity cost of underapplication [22].…”

Section: Impact Of Excess N In Agriculturementioning

confidence: 99%

Nitrogen Fertilization. A Review of the Risks Associated with the Inefficiency of Its Use and Policy Responses

2021

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Nitrogen (N) is a key input to food production. Nearly half of N fertilizer input is not used by crops and is lost into the environment via emission of gases or by polluting water bodies. It is essential to achieve production levels, which enable global food security, without compromising environmental security. The N pollution level expected by 2050 is projected to be 150% higher than in 2010, with the agricultural sector accounting for 60% of this increase. In this paper, we review the status of the pollution from N fertilizers worldwide and make recommendations to address the situation. The analysis reviews the relationship between N fertilizer use, N use efficiency, no-point pollution, the role of farmer management practices, and policy approaches to address diffuse pollution caused by N fertilization. Several studies show a lack of information as one of the main hurdles to achieve changes in habits. The objective of this study is to highlight the gravity of the current global non-point pollution as well as the need for a communication effort to make farmers aware of the relationship between their activity and N pollution and, therefore, the importance of their fertilizer management practices.

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“…Reactive nitrogen losses from agriculture are the main contributor of global nitrogen cycle anomalies (Bodirsky et al, 2014). Greenhouse gas emissions and energy consumption are related to food supply and climate change --√ -- (Grassini & Cassman, 2012;Meng et al, 2020), and have been the focus of intense research recently (Yang et al, 2021). Also, many recent studies have focused on soil acidification and water eutrophication resulting from agriculture (Raza et al, 2020;Stackpoole et al, 2019).…”

Section: Life Cycle Assessmentmentioning

confidence: 99%

Public–private partnership model for intensive maize production in China: A synergistic strategy for food security and ecosystem economic budget

Wang

Zhang

Lakshmanan

et al. 2021

Food and Energy Security

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Global direct nitrous oxide emissions from the bioenergy crop sugarcane (Saccharum spp. inter-specific hybrids)

Cited by 48 publications

References 63 publications

Projected Elevated [CO2] and Warming Result in Overestimation of SPAD-Based Rice Leaf Nitrogen Status for Nitrogen Management

Projected Elevated [CO2] and Warming Result in Overestimation of SPAD-Based Rice Leaf Nitrogen Status for Nitrogen Management

Nitrogen Fertilization. A Review of the Risks Associated with the Inefficiency of Its Use and Policy Responses

Public–private partnership model for intensive maize production in China: A synergistic strategy for food security and ecosystem economic budget

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