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Agronomy
Special Issues
Chemical Characterization of Humus and Its Comprehensive Application in Agriculture
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Chemical Characterization of Humus and Its Comprehensive Application in Agriculture

A special issue of Agronomy (ISSN 2073-4395). This special issue belongs to the section "Soil and Plant Nutrition".

Deadline for manuscript submissions: closed (21 April 2023) | Viewed by 3066

Special Issue Editors

Dr. Maite Olaetxea

E-Mail Website
Guest Editor
Department of Environmental Biology, BIOMA Institut, Sciences School, University of Navarra, 31007 Pamplona, Spain
Interests: biostimulant activity and nutrient complexing of humic acids; molecular and genetic mechanisms of biostimulants and fertilizers
Special Issues, Collections and Topics in MDPI journals
Dr. Javier Erro

E-Mail Website
Guest Editor
Department of Chemistry and Soil Chemistry, University of Navarra, 31007 Pamplona, Spain
Interests: plant phosphate nutrition; soil remediation; phosphate fertilizers; nutrient use efficiency
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Ever since human beings started working in agriculture, rhizospheric humic-DOM (Dissolved Organic Matter) has been used as a plant growth promoter. However, the knowledge about the mechanism of the prompt action of humic acid on plant growth and protection is already scarce. To this end, some reports have shown that the structural conformation of a sedimentary humic acid plays a critical role in the primary physiological response of humic acid action. This response included the increase in hydraulic conductivity and shoot development via hormonal signaling (Olaetxea et al. 2015, 2017). Likewise, it was also reported that humic acids from vermicompost activated the regulation of oxidative metabolism via ROS production and contributed to plant root growth via photosynthesis and nitrogen metabolism (Garcia et al, 2016, 2021). Taken together, both promoting actions can possibly indicate a eustress function of humic substances. This function is somehow related to the structural nature of humic matter.

New insights in describing the relationship between the structural conformation of humic substances and the primary action exerted in plants at a transcriptional, post-transcriptional, or physiological level are welcome.

Dr. Maite Olaetxea
Dr. Javier Erro
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Agronomy is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • humic substances
  • conformation
  • primary action
  • eustress

Published Papers (1 paper)

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Research

13 pages, 2471 KiB  
Article
The Composition of Dissolved Organic Matter in Arable Lands: Does Soil Management Practice Matter?
by Thulfiqar Al-Graiti, Gergely Jakab, Noémi Ujházy, Anna Vancsik, Nándor Fodor, Tamás Árendás, Balázs Madarász, Zoltán Barcza, Károly Márialigeti and Zoltán Szalai
Agronomy 2022, 12(11), 2797; https://doi.org/10.3390/agronomy12112797 - 10 Nov 2022
Cited by 3 | Viewed by 2839
Abstract
Dissolved organic matter (DOM) is a key soil quality property, indicative of the organic matter stored in the soil, which may also be a function of temporal variation. This study examines whether DOM is a robust property of the soil, controlling fertility, or [...] Read more.
Dissolved organic matter (DOM) is a key soil quality property, indicative of the organic matter stored in the soil, which may also be a function of temporal variation. This study examines whether DOM is a robust property of the soil, controlling fertility, or if it may change with time. Altogether eight sets of soil samples were collected in 2018 and 2019 from the cultivated topsoil (0–10 cm) of cropland and from a nearby grassland near Martonvásár, Hungary. The study sites were characterized by Chernozem soil and were part of a long-term experimental project comparing the effects of manure application and fertilization to the control under maize and wheat monocultures. DOM was extracted from the samples with distilled water. The dissolved organic carbon (DOC), total dissolved nitrogen (DN), biological index (BIX), fluorescence index (FI), humification index (HIX), carbon nitrogen (C/N) ratio and specific ultraviolet absorbance at 254 nm (SUVA254) index were studied in the arable soils, and the results showed that all the DOM samples were humified, suggesting relevant microbiological contributions to the decomposition of OM and its conversion into more complex molecules (FI = 1.2–1.5, BIX = ~0.5, and HIX = ~0.9). Temporal variations were detected only for the permanent grassland where higher DOM concentration was found in spring. This increased DOM content mainly originated from humified, solid phase associated, recalcitrant OM. In contrast, there were no differences among fertilization treatments and sampling dates under cropfield conditions. Moreover, climatic conditions were not proven as a general ruler of DOM properties. Therefore, momentary DOM alone is not necessarily the direct property of soil organic matter under cropfield conditions. The application of this measure needs further details of sampling conditions to achieve adequate comparability. Full article
(This article belongs to the Special Issue Chemical Characterization of Humus and Its Comprehensive Application in Agriculture)
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