Shared Innovation Space for Sustainable Productivity of
with the Agrosyst team was set for adapting the code and adding the new descriptors - due to the very fine description of the farms, there are many screens to be filled and this requires a training There were two possibilities: o To alleviate this limitation, an online help could have been proposed However, as a
Comparison of different multi-objective calibration criteria
1INRA, Laboratoire d’´etude des Interactions entre Sol – Agrosyst `eme – Hydrosyst eme, UMR LISAH SupAgro-INRA-IRD,` 2 Place Pierre Viala, 34060 Montpellier, France 2HydroSciences Montpellier, Universite Montpellier 2, Case courrier MSE, Place Eug´ ene Bataillon,` 34095 Montpellier Cedex 5, France
Consistency of the Threshold Phosphorus Saturation Ratio
Agrosystems, Geosciences & Environment 3 of 8 Group 2: Ozark Plateauese soils are Al#sols (Razort silt loam, #ne-loamy, mixed, active, mesic Mollic Hapludalfs) and Ultisols (Captina silt loam,
Comment l’Homme contrôle la productivité d’un agrosystème
Comment l’Homme contrôle la productivité d’un agrosystème ? Groupe 2 (PC) Un agrosystème est construit ou modifié par l'Homme afin de prélever une partie de la matière organique végétale (production primaire) ou animale (production secondaire) qu'il produit Il est généralement mono
Carbon footprint of smallholder farms in Central Madagascar
e Institut de Recherche pour le Developpement, UMR Eco &Sols, Ecologie fonctionnelle Biogeochimie des Sols & des Agrosyst"emes, 2 place Viala (Bt 12), F-34060 Montpellier cedex 2, France article info Article history: Received 11 June 2016 Received in revised form 11 October 2016 Accepted 11 October 2016 Available online xxx Keywords: Carbon
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Agrosystems, Geosciences & Environment 1 of 8
Environment
Consistency of the Threshold Phosphorus Saturation Ratio across a Wide Geographic Range of Acid SoilsBiswanath Dari, Vimala D. Nair,* Andrew N. Sharpley, Peter Kleinman, Dorcas Franklin, and Willie G. Harris
Core Ideas
Establish a common threshold in P satura-
tion across a geographic diversity of soils.Predict water-soluble P from soil P storage
capacity to guide fertilizer strategies.Relate runof P concentration with soil P
storage capacity.B. Dari, Aberdeen Research and Extension
Center, Dep. of Plant Sciences, Univ. of Idaho,
Aberdeen, ID 83210; V.D. Nair and W.G. Harris,
Univ. of Florida, Soil and Water Sciences Dep.,
Gainesville, FL 32611; A.N. Sharpley, Univ.
of Arkansas, Crop, Soil and EnvironmentalSciences, Fayetteville, AR 72701; P. Kleinman,
USDA-ARS Pasture Systems and Watershed
Management Research Unit, University Park,
PA 16802; and D. Franklin, Univ. of Georgia,
Crop and Soil Sciences, Athens, GA 30602.
Received 8 Aug. 2018.
Accepted 14 Aug. 2018.
*Corresponding author (vdn@u f .edu).ABSTRACT
Loss of legacy soil phosphorus (P) due to historical over-application of fertilizers and manures can result in eutrophication of water bodies. T e soil P storage capacity (SPSC) has been proposed as a tool to estimate the capacity of humid region soils to act as either sinks or sources of P to runo f or leaching. T e SPSC is based on a threshold molar ratio of extractable P/(Al+Fe), called the soil P s aturation rati o (PSR ), above which water-soluble P a bruptly increases . Objectives were to (i) document consistency of the threshold PSR for a wide geographic range of acid soils, (ii) determine applicability of a SPSC vs. water-soluble P predictive equation to soils from various regions, and (iii) relate SPSC with water quality parameters. Surface samples were collected from acidic, humid-region soils encompassing multiple physiographic provinces of the United States.Water quality data, including dissolved reactive P and total P, were obtained from various study sites.
Phosphorus, Fe, and Al in Mehlich 3 solutions were determined, and PSR and SPSC calculated. T e threshold PSR based on 186 samples is 0.1, indicating a common threshold across the geographic range of this study. Phosphorus concentrations in runo f related closely with SPSC, PSR, and M3-P values of soils that were the source of the runo f . However, SPSC has the additional potential ofestimating extent of legacy P loss at excessive concentrations for soils of eastern and central United
States. Results support general applicability of PSR and SPSC for acid soils. Abbreviations: DRP, dissolved reactive phosphorus; ICP-OES, inductively coupled plasma-optical emission spectrometry; M3-Al, Mehlich 3-extractable aluminum; M3-Fe, Mehlich 3-extractable iron; M3-P, Mehlich 3-extractable phosphorus; PSR, phosphorus saturation ratio; SPSC, soil phosphorus storage capacity; STP, soil test phosphorus; TP, total phosphorus. © 2018 American Society of Agronomy and Crop Science Society of America, 5585 Guilford Road,