Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    We will mail you new results for this query: keywords==soil test values
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Bodemmetingen en bodemweerbaarheid
Os, G.J. van; Braam, G. ; Keidel, H. ; Bloem, J. ; Jagers op Akkerhuis, G.A.J.M. - \ 2013
bodemonderzoek - bodemtestwaarden - bodemweerbaarheid - gewasbescherming - bodemchemie - bodembiologie - soil testing - soil test values - soil suppressiveness - plant protection - soil chemistry - soil biology
Poster met onderzoeksinformatie: zoektocht naar onderlinge samenhang tussen bodemmetingen en de bodemweerbaarheid.
Predicting soil nitrogen supply : relevance of extractable soil organic matter fractions
Ros, G.H. - \ 2011
University. Promotor(en): Willem van Riemsdijk, co-promotor(en): Erwin Temminghoff; Ellis Hoffland. - [S.l.] : S.n. - ISBN 9789085858829 - 243
mineralisatie - organische stikstof - bodem - organisch bodemmateriaal - bodemonderzoek - voorspelling - bodemtestwaarden - beoordeling - oogstresten - mineralization - organic nitrogen - soil - soil organic matter - soil testing - prediction - soil test values - assessment - crop residues

Predicting the potential of soils to supply N is of considerable importance to maximize agricultural N use efficiency and to minimize environmental losses. This research examines and evaluates the current soil testing approach, which uses extractable organic N (EON) fractions to predict soil N supply, using isotopic 15N tracing, multivariate statistics and meta-analytical techniques.
Almost all 20 EON fractions that have been developed during recent decades significantly reflect the potential of soils to supply N, in spite of the strong differences in size and composition of EON due to extraction methodology. The EON fractions have therefore been considered as highly bio-available N pools in soil. However, most of them performed either worse than or similarly to total N as predictor of soil N supply, and the uncertainty of the predicted soil N supply (even under controlled environmental conditions) is still too big for serious improvement of fertilizer management.
A micro-diffusion method is developed to estimate gross EON fluxes in order to investigate the biochemical basis for observed relationships between EON and soil N supply. The fate of EON fractions in N mineralization, in particular those fractions that are obtained with weak hydrolyzing salt solutions, is comparable to that of dissolved organic N (DON). Both DON and EON can be considered as (intermediate) decomposition waste products in an abiotic and biotic controlled equilibrium with total N.
Therefore, their relationship with soil N supply likely reflect that both DON, EON, and soil N supply are mutually dependent on total N.
The dependency of soil N supply on methodological and environmental issues strongly encourages more effort to be put into validation and up-scaling, particularly regarding the quantification of the differences between laboratory and field experiments. A combination of soil testing with simulation modeling is necessary to account for the numerous environmental factors controlling soil N supply. The exact EON fraction that can be used in such an approach is less important and practical considerations may be decisive to select one for routine application in soil analysis.
In conclusion, a holistic approach, which considers spatial and temporal variability of both soil N supply and crop N demand, may provide a successful approach to improving fertilizer management at the farm-scale.

The use of indicators for the identification of phosphorus transfer from agricultural land to surface waters
Koopmans, G.F. ; Schoumans, O.F. ; Chardon, W.J. - \ 2003
Wageningen : Alterra (Alterra-rapport 793) - 54
uitspoelen - bodemwater - oppervlaktewater - landbouwgronden - indicatoren - bodemtestwaarden - risicoschatting - waterverontreiniging - nederland - bodemchemie - fosfaten - soil chemistry - phosphates - leaching - soil water - surface water - agricultural soils - indicators - soil test values - risk assessment - water pollution - netherlands
Increased loading of agricultural soils with phosphorus (P) has been directly associated with P transfer from soil to surface waters, contributing to eutrophication. Policies and measures have been implemented to decrease the P loading. To evaluate the effectiveness of these policies and measures, we propose indicators, selected from literature, which are suitable for the assessment of the potential risk of P transfer at the field level. Our study focuses mainly on simple 'soil' indicators of the potential risk of P transfer only. The indicators were qualitatively assessed on basis of the selection criteria purposive, measurable and reactive. Based on these criteria, P in soil solution and Pw have been selected for testing in a field experiment.
Biologisch bemesten lastig te plannen
Sukkel, W. - \ 2001
Groenten & Fruit 2001 (2001)29. - ISSN 0925-9708 - p. 44 - 45.
biologische landbouw - dierlijke meststoffen - bodemvruchtbaarheid - bodemtestwaarden - plantenvoeding - agrarische bedrijfsvoering - input van landbouwbedrijf - rotaties - organische meststoffen - bedrijfssystemen - organic farming - animal manures - soil fertility - soil test values - plant nutrition - farm management - farm inputs - rotations - organic fertilizers - farming systems
Als voorbeeld van een bemestingsplan wordt het experimentele biologische systeem te Meterik gebruikt. Hierbij wordt uitgegaan van een evenwichtsbemesting voor fosfaat. Tevens is het belang van een goede vruchtwisseling belicht
Humus als 'early warning' voor verdroging en verzuring
Waal, R.W. de; Kemmers, R.H. - \ 2000
Vakblad Natuurbeheer 39 (2000)5. - ISSN 1388-4875 - p. 78 - 80.
humus - verdroging - drogen - verzuring - bodemeigenschappen - natuurbescherming - bodem - ecosystemen - bodemtestwaarden - bodemprofielen - desiccation - drying - acidification - soil properties - nature conservation - soil - ecosystems - soil test values - soil profiles
Zonder het uitvoeren van dure en tijdrovende bodemanalyses kunnen in het veld waarneembare humuskenmerken in een vroeg stadium de beheerder een indicatie geven over het verloop van processen zoals verzuring en verdroging in natuurgebieden
De uitgangstoestand van bodemvariabelen in Norgerholt en Tongerense hei; basisprogramma bosreservaten
Kemmers, R.H. ; Mekkink, P. ; Waal, R.W. de - \ 1998
Wageningen : DLO-Staring Centrum - 39
humus - bosstrooisel - bodemtestwaarden - ruimtelijke variatie - nederland - drenthe - veluwe - forest litter - soil test values - spatial variation - netherlands
In de bosreservaten Norgerholt en Tongerense hei is langs een transect het humusprofiel beschreven en bemonsterd. Behalve gemiddelde waarden en standaardafwijkingen van horizontdikten, nutriëntengehalten en -voorraden, en pH werd voor de langjarige monitoring ook de ruimteljke variabiliteit geanalyseerd. Zowel gehalten als voorraden zijn in het Norgerholt hoger dan in Tongerense hei. Kenmerkend voor de ruimtelijke variabiliteit van beide bosreservaten is het cyclische karakter van de variantie, waarin de dichtheid van de boom- of struikopstand wordt weerspeigeld. Het cyclische karakter herhaalt zich met een golflengte van 6 respecievelijk 15-20 m in Norgerholt en Tongerense hei.
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