The relationship between water‐soluble P and modified Morgan P: results based on data and chemical modelling.

Lumsdon, David G.; Shand, C. A.; Wendler, Renate; Edwards, Anthony C.; Stutter, Marc; Richards, Samia; Sinclair, A. H.

doi:10.1111/sum.12265

Cited by 10 publications

(11 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…2 filter paper, and molybdate‐reactive P was determined by the molybdate‐stannous chloride method (Jackson, 1958). Modified Morgan extractable P is used in Vermont, much of New England, and Scotland (Lumsdon et al, 2016). In our study, P extracted by the Modified Morgan solution and measured by the molybdate colorimetric test is abbreviated as MM‐P‐Color (Young and Ross, 2016; Young et al, 2013).…”

Section: Methodsmentioning

confidence: 99%

Influence of Controlled Drainage and Liquid Dairy Manure Application on Phosphorus Leaching from Intact Soil Cores

Young

Geibel²,

Ross

2017

J of Env Quality

View full text Add to dashboard Cite

Controlled drainage can reduce nitrate export from tile drainage flow, but its impact on phosphorus (P) loss is largely unknown. We compared P leaching from soil cores treated as free drainage (FD) or controlled drainage (CD) before and after manure application. In August 2012, 16 intact cores (45 cm long, 15 cm diameter) were collected from a grass forage field () located in Chazy, NY, and modified for drainage control and sampling. In Experiment 1 (no manure), initial leachate was defined as FD, and leachate collected 21 d later (valves closed) was considered CD. In Experiment 2, seven cores were randomly assigned to CD or FD. Liquid dairy manure was applied at 1.2 × 10 L ha, followed by simulated rainfall 2 h later. Leachate was sampled on Day 7, 14, and 21. Deionized water was applied at 3.4 cm h over 1 h to mimic a 10-yr rainfall event. Total P (TP), soluble reactive P (SRP), dissolved oxygen, iron (Fe), and pH were measured. Results showed that TP ( = 0.03) and SRP ( = 0.35) were lower for CD prior to manure application. Manure application caused 36- and 42-fold increases in TP and SRP; however, TP was lower for CD at 7 ( = 0.06), 14 ( = 0.003), and 21 d ( = 0.002) of water retention. Mean SRP for CD was nearly 40-fold lower than FD by Day 7 ( = 0.02) and remained low, suggesting CD in the field may reduce P export risk to tile drain flow after manure applications.

show abstract

Section: Methodsmentioning

confidence: 99%

Influence of Controlled Drainage and Liquid Dairy Manure Application on Phosphorus Leaching from Intact Soil Cores

Young

Geibel²,

Ross

2017

J of Env Quality

View full text Add to dashboard Cite

show abstract

“…The modified Morgan soil test extractant (a modification of the original Morgan procedure; Morgan, 1941) was used to extract labile P and select cations (Al, Ca, Fe, K, Mg, Mn). Phosphorus extracted by ammonium acetate (NH 4 OAc) is an indicator of plant availability and the basis for P recommendations in much of Vermont and New England (McIntosh, 1969;Jokela et al, 1998); it is also used in Scotland for agronomic and environmental P assessment (Lumsdon et al, 2016). Here, duplicate 4-g samples were extracted for 15 min with 1.25 mol L −1 NH 4 OAc buffered at pH 4.8 using a 1:5 (v/v) soil/solution ratio.…”

Section: Soil Chemical Analysesmentioning

confidence: 99%

Phosphorus Mobilization in Flooded Riparian Soils From the Lake Champlain Basin, VT, USA

Young

Ross

2018

Front. Environ. Sci.

View full text Add to dashboard Cite

Riparian zones can release bioavailable phosphorus and contribute to water quality degradation. Here, we measured phosphorus (P) release to soil porewater (PW) and overlying floodwater (FW) in 12 riparian buffer and 2 agricultural floodplain soils from northwestern Vermont, USA. The objective was to measure P desorption potential and mobilization to floodwater under moderately reducing conditions designed to mimic saturated riparian environments. Duplicate samples (field-moist) were flooded with distilled water in polyethylene beakers modified for PW sampling. Soluble reactive P (SRP) (PW and FW) and PW ferrous iron (Fe 2+) were measured over a 75-day period in the laboratory. Soluble unreactive P (SUP) in PW was also measured twice. Samples from two sites were also flooded after air-drying to assess the effect of drying soil on SRP release. Results indicated PW-SRP tended to increase over time, whereas FW-SRP tended to decrease. The ratio of PW-SRP on day-75 to initial concentrations ranged from 0.21 to 8.4 (mean = 3.2 ± 2.7), while the ratio for FW-SRP was 0.19 to 1.3 (mean = 0.63 ± 0.39). Mean PW-and FW-SRP ranged from 0.03 to 2.2 mg/L and 0.01 to 0.33 mg/L, respectively. Reduction occurred in 13/14 soils as indicated by PW-Fe 2+ , while FW remained oxidized. Mean PW-(R 2 = 0.48, P = 0.006) and FW-SRP (R 2 = 0.47, P = 0.007) increased with pH, whereas PW-SUP increased at lower pH (R 2 = 0.44, P = 0.01). Mean ratio of PW-SRP:FW-SRP was 3.5 ± 1.9 and increased with soil pH (R 2 = 0.59, P = 0.001). Modified Morgan extractable P was a good predictor of both mean FW-(R 2 = 0.75, P < 0.0001) and PW-SRP (R 2 = 0.77, P < 0.0001) and release over time. Flooding air-dried soil decreased FW dissolved oxygen concentrations and increased PW-Fe 2+ , PW-SRP, and SRP mobilization to FW relative to a field-moist state. Results indicate that while PW-SRP release was substantial, mobilization to overlying FW was limited by resorption of released P. Our results highlight the importance of integrating labile soil P measures with hydrologic flow pathways in models to better predict P transport in riparian landscapes.

show abstract

“…In this range, soluble P can be either positively or negatively related to pH. In particular, the relationship between P solubility and pH was shown to be non‐linear, and P in fact becomes more soluble when the Ca concentration increases (Lumsdon et al, ). Figure shows the relationship between soluble Ca and P in wood ash and the corresponding stabilized samples (1 and 2 months after the stabilization).…”

Section: Resultsmentioning

confidence: 99%

Stabilized biomass ash as a sustainable substitute for commercial P‐fertilizers

et al. 2018

View full text Add to dashboard Cite

The reuse of biomass ash as a fertilizer is generally recognized as good practice with several environmental benefits. However, the possible presence of leachable heavy metals in this ash limits the potential extent of its application and the implementation of an appropriate legal framework. For the first time, a method to stabilize wood ash based on the use of other by‐products (coal fly ash and rice husk ash) is presented. No commercial chemicals are employed in the procedure. The results show that despite the initial presence of leachable heavy metals in the ash, the final obtained material is stable. In addition, the lowering of pH (from 13.5 to approximately 7.5) due to carbonation reactions and the addition of Ca‐rich ash increases the phosphorous availability compared with the starting wood ash and makes the obtained material suitable for use in soil fertilization. The sustainability of the new proposed technology is quantitatively discussed with regard to the differences in embodied energy and CO2 footprint of phosphorous between raw materials and stabilized wood ash. This work shows that the prospects for energy saving and CO2 footprint reduction using stabilized wood ash as a substitute for inorganic commercial P‐fertilizers are significant and offer a new way to reach these objectives. The simplicity of the method and the general availability of the by‐products employed in the stabilization also render the procedure suitable for applications in developing countries.

show abstract

The relationship between water‐soluble P and modified Morgan P: results based on data and chemical modelling.

Cited by 10 publications

References 26 publications

Influence of Controlled Drainage and Liquid Dairy Manure Application on Phosphorus Leaching from Intact Soil Cores

Influence of Controlled Drainage and Liquid Dairy Manure Application on Phosphorus Leaching from Intact Soil Cores

Phosphorus Mobilization in Flooded Riparian Soils From the Lake Champlain Basin, VT, USA

Stabilized biomass ash as a sustainable substitute for commercial P‐fertilizers

Contact Info

Product

Resources

About