Linking crop- and soil-based approaches to evaluate system nitrogen-use efficiency and tradeoffs

Martinez-Feria, Rafael A.; Castellano, Michael J.; Dietzel, Ranae; Helmers, Matt; Liebman, Matt; Huber, Isaiah; Archontoulis, Sotirios

doi:10.1016/j.agee.2018.01.002

Cited by 88 publications

(69 citation statements)

References 87 publications

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“…For example, in 2013, IWG root NUE increased by 40% in the Low N and Mid N treatments and by 87% in the High N treatments. However, excluding belowground components from NUE calculations overlooks the important pool of N that roots represent and ultimately underestimates deep-rooted crops and their ability to retain N (Dawson et al, 2008;Martinez-Feria et al, 2018). Traditionally, root N content has not been included in NUE calculations (Weih et al, 2011).…”

Section: Fertilizer Nitrogen Use Efficiency In Annual Versus Perenniamentioning

confidence: 99%

“…Traditionally, root N content has not been included in NUE calculations (Weih et al, 2011). However, excluding belowground components from NUE calculations overlooks the important pool of N that roots represent and ultimately underestimates deep-rooted crops and their ability to retain N (Dawson et al, 2008;Martinez-Feria et al, 2018).…”

Section: Fertilizer Nitrogen Use Efficiency In Annual Versus Perenniamentioning

confidence: 99%

“…Although there are a wide variety of methods and equations for assessing NUE in disciplines spanning from agronomy to economics (Martinez-Feria et al, 2018), rarely do they account for roots. Given that roots represent large pools of N, neglecting to include roots within NUE equations could ultimately underestimate NUE, especially in perennial cropping systems (Dawson et al, 2008;Martinez-Feria et al, 2018). Given that roots represent large pools of N, neglecting to include roots within NUE equations could ultimately underestimate NUE, especially in perennial cropping systems (Dawson et al, 2008;Martinez-Feria et al, 2018).…”

mentioning

confidence: 99%

“…Nitrogen use efficiency as defined here is the ratio of N fertilizer added to a system relative to the amount of N that leaves via harvest (Robertson and Vitousek, 2009). Although there are a wide variety of methods and equations for assessing NUE in disciplines spanning from agronomy to economics (Martinez-Feria et al, 2018), rarely do they account for roots. Including roots is important because belowground plant biomass N in cereals can account for up to 60% of total plant N, whereas N rhiodeposits account for up to 71% of total assimilated plant N (Wichern et al, 2008).…”

mentioning

confidence: 99%

“…Including roots is important because belowground plant biomass N in cereals can account for up to 60% of total plant N, whereas N rhiodeposits account for up to 71% of total assimilated plant N (Wichern et al, 2008). Given that roots represent large pools of N, neglecting to include roots within NUE equations could ultimately underestimate NUE, especially in perennial cropping systems (Dawson et al, 2008;Martinez-Feria et al, 2018).…”

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confidence: 99%

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How Does Nitrogen and Perenniality Influence Belowground Biomass and Nitrogen Use Efficiency in Small Grain Cereals?

et al. 2018

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Perennial cropping systems typically exhibit extensive root systems that contribute to important ecosystem services. However, the root systems and the distribution of roots throughout the soil profile in novel perennial grains have yet to be reported. In addition, understanding the full impact of perennial grain cropping systems on belowground processes requires knowledge of how N regimes might influence biomass partitioning and N retention. Here, we quantified root biomass distribution, crop biomass allocation, and whole-crop fertilizer N use efficiency (NUE, defined as the ratio of plant N to total N fertilizer applied) in annual winter wheat (Triticum aestivum L. 'Caledonia') and perennial intermediate wheatgrass [IWG, Thinopyrum intermedium (Host) Barkworth & D.R. Dewey] across three N treatments over a 3-yr period. Nitrogen treatments included Low N (90 kg ha −1 of poultry manure), Mid N (90 kg ha −1 of urea), and High N (135 kg ha −1 of urea). As a perennial plant, IWG had significantly greater root biomass than annual wheat to the 40-cm depth (p < 0.05), but no differences were found between the crops at deeper depths. Nitrogen treatments did not affect root biomass, except for IWG in its fourth year (p < 0.05). Regardless of N level, IWG always had greater whole-crop NUE than annual wheat (p < 0.05). Results demonstrate that IWG roots represent a large pool of N that contributes to enhanced NUE and ultimately greater N retention than in annual wheat roots.

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Section: Fertilizer Nitrogen Use Efficiency In Annual Versus Perenniamentioning

confidence: 99%

Section: Fertilizer Nitrogen Use Efficiency In Annual Versus Perenniamentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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How Does Nitrogen and Perenniality Influence Belowground Biomass and Nitrogen Use Efficiency in Small Grain Cereals?

et al. 2018

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The fate of nitrogen of ammonium phosphate fertilizers: A blind spot

Margenot,

Lee

2023

Agricultural & Env Letters

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Ammonium phosphate fertilizers are a common phosphorus (P) source for crops, namely monoammonium phosphate, diammonium phosphate, and ammonium polyphosphate. Despite containing appreciable nitrogen (N), ammonium phosphate fertilizers are generally considered P fertilizers. However, the approximately 8.5 million Mg N co‐applied with P annually as ammonium phosphate fertilizers represents 8% of global N fertilizer input flux to agroecosystems. Despite this, a systematic review of the literature revealed only one direct assessment of N losses from ammonium phosphate fertilizers. An additional five studies reported NO3‐N leaching and N2O‐N emissions from soils fertilized with ammonium phosphates, but inadvertently as observations from failed or control treatments that are confounded (e.g., not accounting for non‐fertilizer contributions to N losses). The magnitude and fate of N co‐applied with P in ammonium phosphate fertilizers is a blind spot in agroecosystem N budgets and environmental footprints that necessitates quantification.

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Using fall‐seeded cover crop mixtures to enhance agroecosystem services: A review

Lavergne

Vanasse

Thivierge

et al. 2021

Agrosystems Geosci & Env

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The intensification of agriculture has resulted in the loss of species diversity in agroecosystems. Crop diversification not only improves ecosystem functions but increases agroecosystem resilience to climate change. Cover crops (CC) are used in the crop rotation to increase plant diversity and provide continuous living roots and soil cover. Previous studies have focused mainly on pure stands of CC and on binary mixtures. In recent years, there has been a growing interest in multispecies mixtures (>2 species). Here, we review reports from the literature to document the effectiveness of fall-seeded CC mixtures to provide agroecosystem services such as weed suppression, N cycling, soil organic C storage, and crop productivity. We cover both organic and conventional field crop systems in North America and Europe. We found, for both systems, that fall-seeded CC mixtures increased many agroecosystem services compared with a control without CC; however, they had inconsistent effects in comparison with a pure stand. The capacity of mixtures to enhance a given agroecosystem service was found to be dependent on the species functional group. Legume-based mixtures increased soil N and C contents along with crop yield, whereas nonlegume mixtures improved N recycling and weed suppression. Differences in the functional groups within CC mixtures could lead to trade-offs among agroecosystem services. Future research should focus on what drives species-specific contributions to productivity and other ecosystem services when CC are seeded in mixtures. More long-term research is needed to provide better insights into the stability of the ecosystem services provided by CC mixtures.The intensification of agriculture in response to the increasing needs of the growing global population has led to a Abbreviations: CC, cover crop(s); SOC, soil organic carbon.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Linking crop- and soil-based approaches to evaluate system nitrogen-use efficiency and tradeoffs

Cited by 88 publications

References 87 publications

How Does Nitrogen and Perenniality Influence Belowground Biomass and Nitrogen Use Efficiency in Small Grain Cereals?

How Does Nitrogen and Perenniality Influence Belowground Biomass and Nitrogen Use Efficiency in Small Grain Cereals?

The fate of nitrogen of ammonium phosphate fertilizers: A blind spot

Using fall‐seeded cover crop mixtures to enhance agroecosystem services: A review

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