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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Record number 401550
Title Estimation of plant-available nitrogen in soils using rapid chemical and biological methods
Author(s) Velthof, G.L.; Oenema, O.
Source Communications in Soil Science and Plant Analysis 41 (2010)1. - ISSN 0010-3624 - p. 52 - 71.
DOI https://doi.org/10.1080/00103620903360270
Department(s) SS - Soil Quality and Nutrients
Publication type Refereed Article in a scientific journal
Publication year 2010
Keyword(s) potentially mineralizable nitrogen - organic-matter - n-mineralization - drying temperature - grassland soils - extraction - fractions - electroultrafiltration - prediction - quality
Abstract The relationships between potential laboratory indices for plant-available nitrogen (N) and the plant N uptake in a pot experiment with ryegrass were assessed for 13 mineral soils and 2 peat soils. The methods included aerobic soil incubation, soil incubation in a bioreactor, hot potassium chloride (KCl)-extractable mineral N, 0.01 M calcium chloride (CaCl2)-extractable N, and N loss at heating. The indices for total plant-available N accounted for 63-93% of the variance in N uptake in a statistical analysis with all soils (n = 15) and 27-89% for the mineral soils (n = 13). Most indices were not a direct quantitative measure of the plant N uptake. The N mineralization indices accounted for 57-86% of the variance in N mineralization for all soils and 5-50% for the mineral soils. Hot KCl-extractable mineral N and 0.01 M CaCl2-extractable N were the most promising rapid indices for plant-available N.
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