Long‐Term Agronomic Drawdown of Soil Phosphorus in Mid‐Atlantic Coastal Plain Soils

Fiorellino, Nicole M.; Kratochvil, Robert J.; Coale, F. J.

doi:10.2134/agronj2016.07.0409

Cited by 38 publications

(54 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, this process of soil P "draw-down" can require decades. For example, Fiorellino et al [9] conducted a long term P draw-down study on soils that had initial Mehlich-3 P concentrations ranging from 200 to nearly 400 mg kg −1 . The authors ceased P applications and removed soil P via grain and forage crop rotations; they estimated 20 to 25 years until soil P levels return to 100 mg kg −1 .…”

Section: Purpose and Justification For Phosphorus Removal Structuresmentioning

confidence: 99%

A Review of Phosphorus Removal Structures: How to Assess and Compare Their Performance

Penn

Chagas

Klimeski

et al. 2017

Water

View full text Add to dashboard Cite

Controlling dissolved phosphorus (P) losses to surface waters is challenging as most conservation practices are only effective at preventing particulate P losses. As a result, P removal structures were developed to filter dissolved P from drainage water before reaching a water body. While many P removal structures with different P sorption materials (PSMs) have been constructed over the past two decades, there remains a need to evaluate their performances and compare on a normalized basis. The purpose of this review was to compile performance data of pilot and field-scale P removal structures and present techniques for normalization and comparison. Over 40 studies were normalized by expressing cumulative P removal as a function of cumulative P loading to the contained PSM. Results were further analyzed as a function of retention time (RT), inflow P concentration, and type of PSM. Structures treating wastewater were generally more efficient than non-point drainage water due to higher RT and inflow P concentrations. For Ca-rich PSMs, including slag, increased RT allowed for greater P removal. Among structures with low RT and inflow P concentrations common to non-point drainage, Fe-based materials had an overall higher cumulative removal efficiency compared to non-slag and slag materials.

show abstract

Section: Purpose and Justification For Phosphorus Removal Structuresmentioning

confidence: 99%

A Review of Phosphorus Removal Structures: How to Assess and Compare Their Performance

Penn

Chagas

Klimeski

et al. 2017

Water

View full text Add to dashboard Cite

show abstract

“…Second, typical rates of annual crop P removal (∼20 to 40 kg ha −1 ) are often orders of magnitude less than total soil P in high P soils (∼3000 to 4000 kg ha −1 in a 0‐ to 30‐cm depth). Therefore, once soil P has become high, it can remain in excess of agronomic needs for years to decades and lose P to the environment at rates that impair water quality (Fiorellino et al, 2017). It is important from both management and policy perspectives to have realistic expectations about the pace of water quality improvement in watersheds with widespread legacy soil P. It is therefore necessary to reliably estimate rates of soil P drawdown and associated rates of P loss in runoff and erosion for a variety of soil and management conditions.…”

mentioning

confidence: 99%

Estimating Legacy Soil Phosphorus Impacts on Phosphorus Loss in the Chesapeake Bay Watershed

et al. 2018

Self Cite

View full text Add to dashboard Cite

Agricultural nutrient management is an issue due to P loss from fields and water quality degradation. This is especially true in watersheds where a history of P application in excess of crop needs has resulted in elevated soil P (legacy P). As practices and policy are implemented in such watersheds to reduce P loss, information is needed on time required to draw down soil P and how much P loss can be reduced by drawdown. We used the Annual P Loss Estimator (APLE) model to simulate soil P drawdown in Maryland, and to estimate P loss at a statewide scale associated with different combinations of soil P and P transport. Simulated APLE soil P drawdown compared well with measured rates from three field sites, showing that APLE can reliably simulate P dynamics for Maryland soils. Statewide APLE simulations of average annual P loss from cropland (0.84 kg ha) also compared well with estimates from the Chesapeake Bay Model (0.87 kg ha). The APLE results suggest that it is realistic to expect that a concerted effort to reduce high P soils throughout the state can reduce P loss to the Chesapeake Bay by 40%. However, P loss reduction would be achieved gradually over several decades, since soil P drawdown is very slow. Combining soil P drawdown with aggressive conservation efforts to reduce P transport in erosion could achieve a 62% reduction in state-level P loss. This 62% reduction could be considered a maximum amount possible that is still compatible with modern agriculture.

show abstract

“…Fiorellino et al (2017) and Kamprath (1999) demonstrated that at very high STP (>100 mg kg −1 ; as Mehlich‐3 P), crop yields were not affected for over 15 yr when P applications ceased. Extrapolating STP drawdown, these researchers suggested it would take more than 30 yr to decrease STP below the agronomic critical level depending on the soil texture and initial soil test level.…”

Section: Implementing Conservation Practices That Reduce Agriculturalmentioning

confidence: 99%

“…The STP of Lynchburg soil (fine‐loamy, siliceous, semiactive, thermic Aeric Paleaquult) was three times greater than the agronomic critical level (50 mg kg −1 ), the level at which a yield response would be expected (Kamprath, 1999). Elevated STP was more than seven times greater than the agronomic critical level (also 50 mg kg −1 for Maryland) in Mattapex silt loam (fine‐silty, mixed active, mesic Aquic Hapludult) (Fiorellino et al, 2017). …”

Section: Implementing Conservation Practices That Reduce Agriculturalmentioning

confidence: 99%

Increasing the Effectiveness and Adoption of Agricultural Phosphorus Management Strategies to Minimize Water Quality Impairment

Osmond

Shober²,

Sharpley

et al. 2019

J of Env Quality

View full text Add to dashboard Cite

Phosphorus (P) is essential for optimum agricultural production, but it also causes water quality degradation when lost through erosion (sediment‐attached P), runoff (soluble reactive P; SRP), or leaching (sediment‐attached P or SRP). Implementation of conservation practices (CP) affects P at the source (avoiding), during transport (controlling), or at the water resource edge (trapping). Trade‐offs often occur with CP implementation. For instance, multiple researchers have shown that conservation tillage reduces total P by over 50%, while increasing SRP by upward of 40%. Conservation tillage may increase water quality degradation as SRP is more bioavailable than is particulate P. Conservation practices must be implemented as a system of practices to increase redundancy and to address all loss pathways, such as P management with conservation tillage and a riparian buffer. Further, planning and adoption must be at a watershed scale to ensure practices are placed in critical source areas, thereby providing the most treatment for the least price. Farmers must be involved in watershed planning, which should include financial backstopping and educational outreach. It is imperative that CPs be used more effectively to reduce and retard off‐site P losses. New and innovative CPs are needed to improve control of P leaching, address legacy stores of soil test P, and mitigate increased P losses expected with climate change. Without immediate changes to CP implementation, P losses will increase due to climate change, with a concomitant degradation of water quality. These changes must be made at a watershed scale and in an intentional and transparent manner. Core Ideas Phosphorus‐reducing conservation practices must control all P pathways. Phosphorus‐reducing conservation practices must be utilized as systems. New and innovative conservation practices are needed to improve control of P. Farmer decision‐making must be considered when implementing conservation practices. Watershed planning and conservation practice implementation must be intentional.

show abstract

Long‐Term Agronomic Drawdown of Soil Phosphorus in Mid‐Atlantic Coastal Plain Soils

Cited by 38 publications

References 12 publications

A Review of Phosphorus Removal Structures: How to Assess and Compare Their Performance

A Review of Phosphorus Removal Structures: How to Assess and Compare Their Performance

Estimating Legacy Soil Phosphorus Impacts on Phosphorus Loss in the Chesapeake Bay Watershed

Increasing the Effectiveness and Adoption of Agricultural Phosphorus Management Strategies to Minimize Water Quality Impairment

Contact Info

Product

Resources

About