Details
| Original language | English |
|---|---|
| Pages (from-to) | S107-S111 |
| Journal | Archives of Agronomy and Soil Science |
| Volume | 58 |
| Issue number | SUPPL. |
| Publication status | Published - Oct 2012 |
Abstract
The soil capacity to supply nitrogen (N) to crops through decomposition of soil organic matter (SOM) is a main indicator for soil fertility. Assessment of a soil net N mineralization potential via long-term laboratory incubations accounts for many of the influencing factors as it integrates the activity of soil micro-organisms and to some extent, the physical accessibility of SOM. A two-pool first-order kinetic equation was used to fit cumulative net N mineralization data from incubations. It allowed the identification of a fast mineralizable N pool, N fast (N in fresh residues), and a slow mineralizable N pool, N slow, which mainly consists of humified SOM. Since the latter represents long-term soil N supply and is a mostly inherent soil property, it could be used as an indicator for soil fertility. We will present results from different studies: • A watershed study (NW-Germany), where reliable pedotransfer functions for site-specific estimates of pool size N slow were derived. • A study in the Kalahari region, where the approach helped to understand the relevance of the soil net N mineralization potential for groundwater pollution with nitrate. • A study aiming to develop an internet-service for field-specific simulations of current net N mineralization (NW-Germany).
Keywords
- biological method, digital soil maps, laboratory incubations, long-term soil N supply
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Agronomy and Crop Science
- Agricultural and Biological Sciences(all)
- Soil Science
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In: Archives of Agronomy and Soil Science, Vol. 58, No. SUPPL., 10.2012, p. S107-S111.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Long-term net N mineralization potential as an indicator for soil fertility
T2 - Chances and constraints
AU - Heumann, Sabine
AU - Ringe, Horst
AU - Böttcher, Jürgen
N1 - Copyright: Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/10
Y1 - 2012/10
N2 - The soil capacity to supply nitrogen (N) to crops through decomposition of soil organic matter (SOM) is a main indicator for soil fertility. Assessment of a soil net N mineralization potential via long-term laboratory incubations accounts for many of the influencing factors as it integrates the activity of soil micro-organisms and to some extent, the physical accessibility of SOM. A two-pool first-order kinetic equation was used to fit cumulative net N mineralization data from incubations. It allowed the identification of a fast mineralizable N pool, N fast (N in fresh residues), and a slow mineralizable N pool, N slow, which mainly consists of humified SOM. Since the latter represents long-term soil N supply and is a mostly inherent soil property, it could be used as an indicator for soil fertility. We will present results from different studies: • A watershed study (NW-Germany), where reliable pedotransfer functions for site-specific estimates of pool size N slow were derived. • A study in the Kalahari region, where the approach helped to understand the relevance of the soil net N mineralization potential for groundwater pollution with nitrate. • A study aiming to develop an internet-service for field-specific simulations of current net N mineralization (NW-Germany).
AB - The soil capacity to supply nitrogen (N) to crops through decomposition of soil organic matter (SOM) is a main indicator for soil fertility. Assessment of a soil net N mineralization potential via long-term laboratory incubations accounts for many of the influencing factors as it integrates the activity of soil micro-organisms and to some extent, the physical accessibility of SOM. A two-pool first-order kinetic equation was used to fit cumulative net N mineralization data from incubations. It allowed the identification of a fast mineralizable N pool, N fast (N in fresh residues), and a slow mineralizable N pool, N slow, which mainly consists of humified SOM. Since the latter represents long-term soil N supply and is a mostly inherent soil property, it could be used as an indicator for soil fertility. We will present results from different studies: • A watershed study (NW-Germany), where reliable pedotransfer functions for site-specific estimates of pool size N slow were derived. • A study in the Kalahari region, where the approach helped to understand the relevance of the soil net N mineralization potential for groundwater pollution with nitrate. • A study aiming to develop an internet-service for field-specific simulations of current net N mineralization (NW-Germany).
KW - biological method
KW - digital soil maps
KW - laboratory incubations
KW - long-term soil N supply
UR - http://www.scopus.com/inward/record.url?scp=84867524159&partnerID=8YFLogxK
U2 - 10.1080/03650340.2012.695862
DO - 10.1080/03650340.2012.695862
M3 - Article
AN - SCOPUS:84867524159
VL - 58
SP - S107-S111
JO - Archives of Agronomy and Soil Science
JF - Archives of Agronomy and Soil Science
SN - 0365-0340
IS - SUPPL.
ER -