Searching for sensitive indicators of fertilization-induced SOM changes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00027006%3A_____%2F17%3A00004337" target="_blank" >RIV/00027006:_____/17:00004337 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Searching for sensitive indicators of fertilization-induced SOM changes

Popis výsledku v původním jazyce

Topsoil samples were taken between 2004 and 2014 from long-term field trials (LTEs) along a climate sequence in the Czech Republic. Evaluated treatments included: unfertilized from the commencement of the experiments (Nil), mineral fertilized (NPK), farmyard manured (FYM), and combined (FYM+NPK). SOM analyses performed: TOC, hot water exctractable C (Clab), detection of FTIR spectra peaks at 3000-2800 cm-1 (FTIRaliph) and 1660-1580 cm-1 (FTIR arom). C pool index (CPI), lability index (LI) and C management index (CMI) based on TOC and Clab were calculated. SOM decomposition index (DI) was calculated as a ratio between FTIRarom and FTIRaliph. Regardless of site conditions, NPK and especially FYM fertilization increased the TOC, Clab, CPI, LI, CMI and FTIRaliph in all experimental plots compared to Nils (Fig. 1), while the highest FTIRarom and DI were determined in Nils. DI was the most sensitive to SOM changes with 36% change (NPK+FYM compared to Nil), followed by FTIRaliph, CMI and Clab (25%). While parameters based on chemical and spectroscopic detection revealed approximately the same extent of SOM differences between treatments, the former varied less over time. The results showed that none of the studied parameters can be used as a stand-alone SOM quality descriptor. The shortcomings of FTIR parameters higher variability can be overcome by increasing the number of measurements taken.

Název v anglickém jazyce

Searching for sensitive indicators of fertilization-induced SOM changes

Popis výsledku anglicky

Topsoil samples were taken between 2004 and 2014 from long-term field trials (LTEs) along a climate sequence in the Czech Republic. Evaluated treatments included: unfertilized from the commencement of the experiments (Nil), mineral fertilized (NPK), farmyard manured (FYM), and combined (FYM+NPK). SOM analyses performed: TOC, hot water exctractable C (Clab), detection of FTIR spectra peaks at 3000-2800 cm-1 (FTIRaliph) and 1660-1580 cm-1 (FTIR arom). C pool index (CPI), lability index (LI) and C management index (CMI) based on TOC and Clab were calculated. SOM decomposition index (DI) was calculated as a ratio between FTIRarom and FTIRaliph. Regardless of site conditions, NPK and especially FYM fertilization increased the TOC, Clab, CPI, LI, CMI and FTIRaliph in all experimental plots compared to Nils (Fig. 1), while the highest FTIRarom and DI were determined in Nils. DI was the most sensitive to SOM changes with 36% change (NPK+FYM compared to Nil), followed by FTIRaliph, CMI and Clab (25%). While parameters based on chemical and spectroscopic detection revealed approximately the same extent of SOM differences between treatments, the former varied less over time. The results showed that none of the studied parameters can be used as a stand-alone SOM quality descriptor. The shortcomings of FTIR parameters higher variability can be overcome by increasing the number of measurements taken.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

40104 - Soil science

Projekt

<a href="/cs/project/QJ1610547" target="_blank" >QJ1610547: Agrotechnika polních plodin v suchých oblastech</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů