Nitrogen input quality changes the biochemical composition of soil organic matter stabilized in the fine fraction: a long-term study

Gillespie, Adam; Diochon, Amanda; L., B.; Morrison, Malcolm J.; Kellman, Lisa; Walley, F.L.; Regier, Tom; Chevrier, D.; Dynes, James J.; Gregorich, E.G.

doi:10.1007/s10533-013-9871-z

Cited by 69 publications

(38 citation statements)

References 64 publications

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“…The pre-edge region of all spectra was subtracted to remove background, and all spectra were normalized to an edge step of one. Peaks were identified according to Gillespie et al (2014aGillespie et al ( , 2014b.…”

Section: Data Analysesmentioning

confidence: 99%

“…3, peak 2), and the two treatments lowest in pyrrolics, (R0F1M0 and R0F2M0) were also lowest in amides. Amides are components of protein that generally decrease in abundance over time because they are a readily accessible source of N for microbes (Gillespie et al 2014a;Albrecht et al 2015). Amides may become lower as amount of fertilizer N addition increases and organic input decreases because N is stimulating decomposition (Appel and Mengel 1990).…”

Section: Yield Average and Trendsmentioning

confidence: 99%

“…Amides may become lower as amount of fertilizer N addition increases and organic input decreases because N is stimulating decomposition (Appel and Mengel 1990). Accumulation of amides may largely be due to adsorption of proteins on mineral surfaces (Gillespie et al 2014a); in these soils there are few mineral surfaces for amide adsorption to occur. Thus amides are likely low because they are broken down with higher N addition.…”

Section: Yield Average and Trendsmentioning

confidence: 99%

“…There was also no difference among treatments in ketones, which are present in microbial material and produced through microbial metabolism of aromatic and fatty acid compounds (Gottschalk 1986;Dent et al 2004;Hitchcock et al 2009). Ketones are mainly retained in the fine mineral fraction (Gillespie et al 2014a), which is very small at Sadore. Overall, low soil organic carbon content in this study may largely be explained by the lack of a fine soil fraction to adsorb organic polymers and protect SOM.…”

Section: Yield Average and Trendsmentioning

confidence: 99%

“…All of these processes leave a chemical signature in SOM. Organic C and N species found in fresh plant material indicate limited microbial breakdown of organic inputs, whereas microbial decomposition results in the formation of microbially-derived C and N groups and biopolymers that can be identified in the soil organic matter (Gillespie et al 2014a).…”

Section: Introductionmentioning

confidence: 99%

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Long term effects of reduced fertilizer rates on millet yields and soil properties in the West-African Sahel

Adams

Gillespie

Kar

et al. 2016

Nutr Cycl Agroecosyst

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Microdosing, the point-source application of a reduced fertilizer rate within 10 days of sowing, has increased short-term crop yields across the Sahel and is being actively scaled up as an agronomic practice. However, there is no information on the longterm effects of the technique upon soil fertility. To rectify this, this study used soil samples from the International Crop Research Institute for the SemiArid Tropics in Sadore, Niger, to assess the effects of 16 years of a reduced fertilizer rate of 15 kg N and 4.4 kg P ha -1 compared to unfertilized soil and a recommended rate of 30 kg N and 13.2 kg P ha -1 upon millet yield trend, soil chemical properties, and soil organic matter quality. The interaction of fertilizer with crop residue and manure amendments at 300, 900, and 2700 kg ha -1 was also assessed. Compared to unfertilized soil, the reduced fertilizer rate improved yield by 116 % but did not increase total N or available P. The recommended rate doubled available P and increased total N by 27 %, but resulted in slightly lower pH compared to the reduced rate. Yield trends were negative for both fertilizer treatments, indicating mineral fertilizer alone is not sustainable at Sadore. Crop residue or manure addition at 2700 kg ha -1 with fertilizer did not improve SOC but buffered pH by 0.3 units, provided nutrients beyond N and P, and changed the forms C and N functional groups in soil organic matter.

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Section: Data Analysesmentioning

confidence: 99%

Section: Yield Average and Trendsmentioning

confidence: 99%

Section: Yield Average and Trendsmentioning

confidence: 99%

Section: Yield Average and Trendsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Long term effects of reduced fertilizer rates on millet yields and soil properties in the West-African Sahel

Adams

Gillespie

Kar

et al. 2016

Nutr Cycl Agroecosyst

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Methoden der Humusanalyse

Glaser¹,

Dippold²

2018

Handbuch Der Bodenkunde

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Potassium‐Ion‐Assisted Regeneration of Active Cyano Groups in Carbon Nitride Nanoribbons: Visible‐Light‐Driven Photocatalytic Nitrogen Reduction

Wang

Zhang

et al. 2019

Angewandte Chemie

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As a metal‐free nitrogen reduction reaction (NRR) photocatalyst, g‐C3N4 is available from a scalable synthesis at low cost. Importantly, it can be readily functionalized to enhance photocatalytic activities. However, the use of g‐C3N4‐based photocatalysts for the NRR has been questioned because of the elusive mechanism and the involvement of N defects. This work reports the synthesis of a g‐C3N4 photocatalyst modified with cyano groups and intercalated K+ (mCNN), possessing extended visible‐light harvesting capacity and superior photocatalytic NRR activity (NH3 yield: 3.42 mmol g−1 h−1). Experimental and theoretical studies suggest that the ‐C≡N in mCNN can be regenerated through a pathway analogous to Mars van Krevelen process with the aid of the intercalated K+. The results confirm that the regeneration of the cyano group not only enhances photocatalytic activity and sustains the catalytic cycle, but also stabilizes the photocatalyst.

show abstract

Nitrogen input quality changes the biochemical composition of soil organic matter stabilized in the fine fraction: a long-term study

Cited by 69 publications

References 64 publications

Long term effects of reduced fertilizer rates on millet yields and soil properties in the West-African Sahel

Long term effects of reduced fertilizer rates on millet yields and soil properties in the West-African Sahel

Methoden der Humusanalyse

Potassium‐Ion‐Assisted Regeneration of Active Cyano Groups in Carbon Nitride Nanoribbons: Visible‐Light‐Driven Photocatalytic Nitrogen Reduction

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