SW—Soil and Water

Lewis, D.R.; McGechan, M.B.

doi:10.1006/bioe.2002.0102

Cited by 52 publications

(7 citation statements)

References 39 publications

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“…The most used non-linear isotherms are those of Freundlich and Langmuir, in which the percentage of adsorbed ion decreases as ion concentration increases. Soil science employs widely used phosphorus, zinc, selenium, and cadmium ion representations (Rennie and McKercher, 1959;Weir and Soper, 1962;John, 1972;Al-Kanani and MacKenzie, 1991;Dhillon and Dhillon, 1999;Lewis and McGechan, 2002;Mesquita and Vieira e Silva, 2002;Wang and Harrell, 2005;Bolster, 2008) while on the contrary, few isotherm representations exist in agricultural models to simulate ammonium exchange and fixation, and only in a few cases do they account for soil water content and temperature effects (e.g., Cameron and Kowalenko, 1976;Kowalenko and Cameron, 1976;Stöckle and Nelson, 2014). Frissel and Van Veen (1978) used a different approach and represented fixation using a reversible first-order kinetic reaction between fixed and soluble forms; however, no exchangeable form representation was done.…”

Section: Introductionmentioning

confidence: 99%

Measurement and simulation of soluble, exchangeable, and non-exchangeable ammonium in three soils

2015

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Section: Introductionmentioning

confidence: 99%

Measurement and simulation of soluble, exchangeable, and non-exchangeable ammonium in three soils

2015

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“…Exchangeable sorbed P (P ex ) is another important source of bioavailable P. it is the part of soil P that is exchangeable and adsorbed on the surface of soil particles and can be easily released to the soil solution. this fraction can be estimated for example with anion resins (tiessen and Moir 1993, lewis andMcGechan 2002), or recently, via anion exchange (aE) membranes (Kuono et al 1995, Sato andComerford 2006). the most commonly used methods are those for estimating total bioavailable P in soils: e.g.…”

mentioning

confidence: 99%

Evaluation of phosphorus mobility in soil using different extraction methods

Kulhánek¹,

Balík²,

Cerny³

et al. 2009

PLANT SOIL ENVIRON

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Soil samples (from Czech and German long-term field experiments) were used to estimate different soil phosphorus (P) fractions. More than 200 topsoil (0-30 cm) samples from different fertilizing treatments were taken. These were analyzed for P in soil solution (P CaCl 2 ) [0.01M CaCl 2 extract], exchangeable sorbed P (P ex ) [anion exchange (aE) membranes] and bioavailable P [Doppel-lactat and Mehlich 3 (P Dl and P M3 )]. other fractions analyzed were total inorganic (P in ), total (P M-tot ) and organic (P org ) P [fractionation after Marks], P sorbed on Fe and al (P Feal ) [fractionation after Schwertmann] and residual P (P ar ) [aqua regia extract]. Comparison of medians appeared to be better for evaluating extraction abilities. Phosphorus fractions were in the following order: (P ar = 100%); P CaCl 2 (0.2%) < P ex (9%) < P Dl (10%) < P M3 (16%) < P in (24%) < P org (37%) < P Feal (55%) < P M-tot (59%). low amounts of P in , P org and P M-tot did not verify the applicability of the Marks' fractionation for the set of studied soils. Close correlations at P ≤ 0.001 were found for all methods for estimating the fractions of bioavailable phosphates (P CaCl 2 , P ex , P Dl and P M3 ). Statistically significant relations were observed between P in with P ar , P M-tot and P Feal .

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“…Prior to using or adjusting a model, the purpose of the modeling exercise must be considered. Sattari (2014) and Lewis and McGechan (2002) review a broad range of soil P models. In the supplemental material, we briefly summarize the novel attributes and differences of the soil P submodels of three major (daily timestep and field-scale) agricultural systems models: EPIC (Williams et al, 1983, the Decision Support System for Agrotechnology Transfer (DSSAT) (Daroub et al, 2003;Jones et al, 2003), and the Agricultural Production Simulation Model (APSIM) (Probert, 2004;Holzworth et al, 2014).…”

Section: Background On Soil Phosphorus Modeling In Agricultural Systemsmentioning

confidence: 99%

Soil Phosphorus Modeling for Modern Agriculture Requires Balance of Science and Practicality: A Perspective

et al. 2019

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The use of phosphorus (P) fertilizers in arable crop and pastoral systems is expected to change as modern agriculture is challenged to produce more food with fewer inputs. Agricultural systems models offer a dual purpose to support and integrate recent scientific advances and to identify strategies for farmers to improve nutrient efficiency. However, compared with nitrogen and carbon, advances in P modeling have been less successful. We assessed the potential opportunity of P modeling to increase P efficiency for modern agriculture and identified the current challenges associated with modeling P dynamics at the field scale. Three major constraints were (i) a paucity of detailed field datasets to model strategies aimed at increasing P use efficiency, (ii) a limited ability to predict P cycling and availability under the local effects of climate change, and (iii) a restricted ability to match measured soil P fractions to conceptual and modelable pools in soils with different mineral properties. To improve P modeling success, modelers will need to walk a tightrope to balance the roles of assisting detailed empirical research and providing practical land management solutions. We conclude that a framework for interdisciplinary collaboration is needed to acquire suitable datasets, continually assess the need for model adjustment, and provide flexibility for progression of scientific theory. Such an approach is likely to advance P management for increased P use efficiency. Core Ideas Models can complement research and identify strategies to increase P efficiency. A variety of quality long‐term field trials is needed to advance model capabilities. Well‐calibrated soil models are needed to assess climate change impacts on P cycling. A framework is needed to streamline multidisciplinary research to improve P management.

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SW—Soil and Water

Cited by 52 publications

References 39 publications

Measurement and simulation of soluble, exchangeable, and non-exchangeable ammonium in three soils

Measurement and simulation of soluble, exchangeable, and non-exchangeable ammonium in three soils

Evaluation of phosphorus mobility in soil using different extraction methods

Soil Phosphorus Modeling for Modern Agriculture Requires Balance of Science and Practicality: A Perspective

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