Global assessment of soil phosphorus retention potential

Limited availability of P in soils to crops may be due to deficiency and/or severe P retention. Earlier studies that drew on large soil profile databases have indicated that it is not (yet) feasible to present meaningful values for "plant-available" soil P, obtained according to comparable analytical methods, that may be linked to soil geographical databases derived from 1:5 million scale FAO Digital Soil Map of the World, such as the 5 x 5 arc-minute version of the ISRIC-WISE database. Therefore, an alternative solution for studying possible crop responses to fertilizer-P applied to soils, at a broad scale, was sought. The approach described in this report considers the inherent capacity of soils to retain phosphorus (P retention), in various forms. Main controlling factors of P retention processes, at the broad scale under consideration, are considered to be pH, soil mineralogy, and clay content. First, derived values for these properties were used to rate the inferred capacity for P retention of the component soil units of each map unit (or grid cell) using four classes (i.e., Low, Moderate, High, and Very High). Subsequently, the overall soil phosphorus retention potential was assessed for each mapping unit, taking into account the P-ratings and relative proportion of each component soil unit. Each P retention class has been assigned to a likely fertilizer P recovery fraction, derived from the literature, thereby permitting spatially more detailed, integrated model-based studies of environmental sustainability and agricultural production at the global and continental level (< 1:5 million). Nonetheless, uncertainties remain high; the present analysis provides an approximation of world soil phosphorus retention potential.

(Table 2) Biostratigraphy of marine benthic and planktonic taxa in sediment core GIK14350 near Dagebüll, northern Germany

Together with foraminifers and ostracods, echinoderm remains are very frequent in Eemian sediments of the Dagebuell Well DA-1. The appearance of holothurian sclerites is particularly noteworthy. In the present study, remains of Holothuroidea from the European Pleistocene are described. These remains could be assigned to the Recent genus Psolus OKEN 1815. Furthermore, a short synopsis of disarticulate holothurian fossils in Holocene and Pleistocene sediments is given.

UM Men's Swimming Team, 1996

Front Row: Chris Rumley, Tom Almeida, Shuichi Matsumoto, Raymond Papa, Al Fleming, Brett Wilmot.

Second Row: diving coach Dick Kimball, Nathan Shepard, David Stephens, Jeff Flermoen, Dawson Hughes, Andy Potts, Joseph Janik, asst. coach Alex Braunfeld.

Third Row: head coach Jon Urbanchek, Ethan Toby Booker, Chris Laskowski, John Reich, Jan Wenzel, Royce Sharp, Joe Palmer.

Back Row: Steven Williams, Derya Buyukuncu, Owen von Richter, Tom Malchow, Tom Dolan, John Piersma, volunteer asst. coach Shigeo Ogata.

Demotische und griechische Texte auf Mumientäfelchen in der Sammlung der Papyrus Erzherzog Rainer,

Mode of access: Internet.

Basler Zeitschrift für Geschichte und Altertumskunde /

Vols for <1970>-1974 contain the excavation reports of the Stiftung Pro Augusta Raurica, published 1975- in Jahresberichte aus Augst und Kaiseraugst.

Neue erdbeschreibung.

1 t., 2. bd., 2. t., 2. bd. have half-titles only.

Consumer goods; how to know and use them

Bibliography at end of each unit.

Q. Horatii Flacci Opera omnia quotquot exstant /

Carminum ; Epodon ; Carmen seculare ad Deos pro Imperio Romano ; De arte poetica ; Sermonum ; Epistolarum.

Fürst Bismarck als Redner : vollständige sammlung der parlamentarischen reden Bismarks seit dem jahre 1847; sachlich und chronologisch geordnet mit ein leitungen und erläuterungen /

Vol. 13 ed. by W. Böhm and A. Dove; vols. 14-16 ed. by A. Dove.

Die sagen Tell und Stauffacher. Eine kritische untersuchung,

Mode of access: Internet.

Io. Alb. Fabricii Bibliotheca latina ... /

Mode of access: Internet.

Dionysius Longinus De Sublimitate /

Mode of access: Internet.

Leçons de morale ou Lectures academiques faites dans l'Universite de Leipzig /

La Biblioteca Histórica posee solo el segundo tomo.

T. Livii Patavini Historiarum libri qui supersunt omnes ex recensione Arn. Drakenborchii /

Mode of access: Internet.

T. Livii Patavini Historiarum libri qui supersunt omnes ex recensione Arn. Drakenborchii /

Mode of access: Internet.