Nitrogen Assessment of Shallow Florida Histosols

Santos, Aline de Camargo; McCray, J. Mabry; Daroub, Samira H.; Rowland, Diane; Ji, Shangning; Sandhu, Hardev S.

doi:10.1080/00103624.2020.1798990

Cited by 4 publications

(3 citation statements)

References 23 publications

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“…However, they can provide insight into the conditions that can trigger N 2 O emissions from these peats. Currently, N fertilizer is not recommended for sugarcane in EAA soils because N mineralization supplies the crop requirements (Santos et al., 2020). Therefore the main source of N 2 O emissions is N mineralization, which is followed by nitrification and denitrification; both of these processes release N 2 O either as an intermediate by‐product (nitrification) or as a final product (denitrification) (Reddy & DeLaune, 2008).…”

Section: Discussionmentioning

confidence: 99%

“…Hu et al (2017) found that denitrification reduces NO 3 concentrations rapidly within 3 d after reflooding drained peats. Higher NO 3 concentrations have been reported for the EAA during the end of the wet season (Miller et al, 2012;Santos et al, 2020), possibly increasing N losses in leachate from EAA fields during this time (Santos et al, 2020). Therefore treatments that minimize oxidation and mineralization during the wet season, such as summer flooding treatment, might be the best choice to reduce N losses in EAA peats.…”

Section: N Forms and Doc In Leachatementioning

confidence: 95%

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Water management effect on soil oxidation, greenhouse gas emissions, and nitrogen leaching in drained peat soils

Rodrı́guez

Daroub

Gerber

et al. 2021

Soil Science Soc of Amer J

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Soil subsidence of peatlands occurs worldwide due to drainage. The Everglades Agricultural Area (EAA), located in South Florida, has been drained for agriculture since 1914, with subsidence resulting in shallow soils in certain areas. The purpose of this study is to determine the impact of water management strategies on soil oxidation and N release as affected by differences in proximity to the bedrock. Oxidation rates (CO 2 efflux), as well as CH 4 and N 2 O emissions, were measured in lysimeters filled with shallow and deep peat subjected to four water treatments. Additionally, NO 3 -N, NH 4 -N, soluble organic N, and dissolved organic C were measured in leachate obtained from the collected soils. Average annual emissions from constantly drained soils were 298 g CO 2 -C m -2 yr -1 , with most of the oxidation taking place between June and October. Short flood cycles increased annual oxidation rates compared with constantly drained soils, which had the second highest oxidation rate. Constantly flooded soils had the lowest annual oxidation rates, followed by summer flooded soils. Total N lost in leachate was highest for constantly drained soils, with NO 3 being the dominant form. The deep soils had higher losses of soluble N and C, whereas NO 3 losses from shallow soils were higher. Soil oxidation rates did not differ depending on proximity to the bedrock. We conclude that strategies that avoid short flooding cycles and include crop rotations that allow flooding during summer can reduce oxidation and N losses in leachate from EAA peats.

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Section: Discussionmentioning

confidence: 99%

Section: N Forms and Doc In Leachatementioning

confidence: 95%

Water management effect on soil oxidation, greenhouse gas emissions, and nitrogen leaching in drained peat soils

Rodrı́guez

Daroub

Gerber

et al. 2021

Soil Science Soc of Amer J

Self Cite

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“…The amount of seasonal N found in drainage water is influenced by fertilizer application, soil biogeochemical properties and the hydrological movement of water through fields (Kennedy et al, 2018). The NO 3 -N and TN concentrations were higher under CD than PD, as there was increased N mineralization, occurring in the soils because of subsidence and organic matter oxidation, leading to additional N within the drainage water (Santos et al, 2020). In contrast to CD, The N loads from agricultural fields are mainly found in the dissolved form, specifically NO 3 -N (Zak et al, 2008).…”

Section: Nitrogen Analysismentioning

confidence: 99%

Nutrient release in drainage discharge from organic soils under two different agricultural water management systems

Grenon

Madramootoo

Sperber

et al. 2023

Hydrological Processes

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The release of available nitrogen (N) and phosphorus (P) from agricultural tile drainage contributes to eutrophication in water bodies. To mitigate the harmful impact of nutrient release, drainage water management (DWM) has been proposed as a beneficial management practice that will limit N and P in tile drainage discharge. This study, conducted in the organic soils of the Holland Marsh, Ontario, assessed the nutrient water quality for 2 years (2015–2016) under DWM systems: controlled drainage (CD) comprising a series of stackable gates to manually control the water table level; and pumped drainage (PD) which uses a submersible pump within a collector well that discharges effluent when activated. The latter is the common method of field drainage in the Holland Marsh, however, there is limited comparable research for either DWM system. The data were separated into growing and fallow seasons as well as winter, spring, and summer seasons for trend analysis (winter: October–February; spring: March–May; summer: June–September). The nitrate (NO3‐N) concentrations, under CD, were found to be on average higher during the winter season (7.64 mg L−1) compared to the growing season (3.76 mg L−1). Furthermore, total N concentrations are positively correlated to discharge (R > 0.55). The average total P concentration increased during the summer period following fertilization; however, there was no correlation between P and drainage discharge throughout the duration of the study. The P concentrations depended more on nutrient inputs, rather than the discharge under CD. The log regression statistical relationship showed significant differences in nutrient levels compared to the mean at both sites, however, greater differences were found under CD. Under PD, the NO3‐N concentrations showed significant seasonal trends between the spring and winter (Pr > t: 0.0061) and summer (Pr > t: <0.0001). Overall, both CD and PD can reduce the amount of tile drain discharge, but the concentrations of N and P are not significantly reduced.

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