Assessing soil quality in different agro-ecosystems through biochemical and chemico-structural properties of humic substances

1999 ◽  
Vol 51 (1-2) ◽  
pp. 129-137 ◽  
Author(s):  
G Masciandaro ◽  
B Ceccanti
Keyword(s):  
Humic Substances ◽  
Soil Quality ◽  
Structural Properties

scholarly journals Relationships between soil quality indicators, redox properties, and bioactivity of humic substances of soils under integrated farming, livestock, and forestry

Revista CERES ◽  
2018 ◽  
Vol 65 (4) ◽  
pp. 373-380 ◽  
Author(s):  
Marihus Altoé Baldotto ◽  
Lílian Estrela Borges Baldotto
Keyword(s):  
Organic Matter ◽  
Soil Carbon ◽  
Humic Substances ◽  
Soil Quality ◽  
Quality Indicators ◽  
Carbon Stocks ◽  
Redox Properties ◽  
Soil Quality Indicators ◽  
Integrated Farming ◽  
Soil Carbon Stocks

ABSTRACT Once it is stabilized in the soil, organic matter minimizes limitations of Brazilian Oxisols, such as low cation exchange capacity, low nutrient availability, toxicity due to high aluminum content, and phosphate adsorption. Moreover, humified organic matter fractions are bioactive. It is, therefore, important to evaluate the biostimulant ability of compounds present in soil carbon stocks to develop sustainable technologies for tropical agriculture based on renewable natural resources. The objective of this research was to correlate some soil quality indicators, redox properties, and bioactivity of humic acids isolated from integrated farming, livestock, and forestry systems aiming to understand the mechanisms involved in plant stimulation by humified organic matter. Carbon stocks and their stability were determined from oxidation by dichromatometry and iodometry, respectively. Bioactivity was assessed using yield data of corn indicator plants. The results indicated that when native-like forests were reintroduced instead of pastureland, soil carbon stocks and their stability increased along with overall improvements in soil fertility, chemical and physical properties, and soil biodiversity. The bioactivity of humic substances isolated from soils used in integrated crop, livestock, and forestry management was higher than that of soils derived from pastures or eucalyptus alone.

The application of photoinduced luminescence in research on humic substances of various origins

2009 ◽  
Vol 38 (3) ◽  
Author(s):  
Lilla Mielnik
Keyword(s):  
Humic Substances ◽  
Structural Properties ◽  
Humic Acids ◽  
Bottom Sediments ◽  
Water Body ◽  
Drainage Basins ◽  
Hydrochemical Parameters ◽  
Halogen Light ◽  
Preliminary Research

The application of photoinduced luminescence in research on humic substances of various originsThis paper discusses preliminary research on using photoinduced luminescence phenomena in determining the structural properties of humic acids extracted from the bottom sediments of two lakes. The lakes examined differ in the hydrochemical parameters of the water body, as well as in the drainage basins surrounding the lakes. Photoinduced luminescence of humic acids was induced with a halogen light of 1500 μmol m

scholarly journals Assessments of Humic Substances Application and Deficit Irrigation in Triploid Watermelon

HortScience ◽  
2020 ◽  
Vol 55 (5) ◽  
pp. 716-721 ◽  
Author(s):  
Kuan Qin ◽  
Daniel I. Leskovar
Keyword(s):  
Humic Substances ◽  
Soil Quality ◽  
Deficit Irrigation ◽  
Citrullus Lanatus ◽  
Total Yield ◽  
Sustainable Systems ◽  
Irrigation Deficit ◽  
Triploid Watermelon ◽  
Sustainable Agricultural Systems ◽  
Property Changes

Soil organic matter degradation and water limitation caused by intense farming activities are some of the major threats affecting agricultural production. Accordingly, the concepts of sustainable agricultural systems with optimized irrigation and improved soil quality can be adapted to address these issues. During this 2-year field study, two management factors—humic substances (HS) as organic inputs (HS vs. control) and deficit irrigation as the irrigation method (50% vs. 100% based on evapotranspiration)—were evaluated based on triploid watermelon (Citrullus lanatus cv. Fascination) yield and soil property changes. HS application increased watermelon early yield by 38.6% and total yield by 11.8% compared with the control; the early yield mainly increased under deficit irrigation. Compared with full irrigation, deficit irrigation increased water use efficiency (WUE) without significantly affecting total yield. In addition, HS application significantly increased the soil organic carbon (SOC) content, which was found to be positively correlated with crop WUE. These results indicate that soil organic inputs with HS and deficit irrigation are valuable strategies to establish sustainable systems for watermelon production, which will not only increase yield and WUE but also significantly improve soil quality and save irrigation water.

scholarly journals CHARACTERIZATION OF BIOGENIC, INTERMEDIATE AND PHYSICOGENIC SOIL AGGREGATES OF AREAS IN THE BRAZILIAN ATLANTIC FOREST

2017 ◽  
Vol 30 (1) ◽  
pp. 59-67 ◽  
Author(s):  
JÚLIO CÉSAR FEITOSA FERNANDES ◽  
◽  
MARCOS GERVASIO PEREIRA ◽  
EDUARDO CARVALHO DA SILVA NETO ◽  
THAÍS DE ANDRADE CORRÊA NETO
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Humic Substances ◽  
Soil Quality ◽  
Secondary Forest ◽  
Soil Aggregates ◽  
Geometric Mean ◽  
Mean Weight Diameter ◽  
Successional Stages ◽  
The Stability

ABSTRACT Aggregate formation and stability are related to soil quality, contributing significantly to the carbon storage and nutrient maintenance capacities of the soil. Soil aggregates are formed by two different process: physicogenic, related to moistening and drying cycles and input of organic matter; and biogenic, related to the action of macrofauna organisms and roots. The objective this work was to classify aggregates according to their formation process, quantify and compare organic carbon contents in humic substances and assess the stability of aggregates formed by different processes, in areas with different coverage in the Mid Paraiba Valley, Pinheiral, State of Rio de Janeiro, Brazil. Aggregated soil samples were collected at a depth of 0-10 cm, in a Cambisol (Cambissolo Háplico Tb Distrófico) under four plant covers: secondary forest in advanced (SFAS), medium (SFMS) and initial (SFIS) successional stages and managed mixed pasture (MMP). Aggregates were classified and identified into three morphological classes (physicogenic, biogenic and intermediate). The variables evaluated were mean weight diameter (MWD) and geometric mean diameter (GMD) of aggregates, chemical fractions of organic matter, total organic carbon (TOC) and humic substances: humin (C-HUM) humic acid (C-FAH) and fulvic acid (C-FAF). Biogenic aggregates were found in smaller quantities and showed higher TOC, C-HUM and C-FAH, compared to intermediate and physicogenic aggregates. Thus, biogenic aggregates have potential to be used as soil quality indicators for structured environments, which are able to maintain its intrinsic formation processes.

scholarly journals Quality of heavy metal-contaminated soil before and after column flushing with washing agents derived from municipal sewage sludge

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Barbara Klik ◽  
Zygmunt M. Gusiatin ◽  
Dorota Kulikowska
Keyword(s):  
Organic Matter ◽  
Sewage Sludge ◽  
Humic Substances ◽  
Soil Quality ◽  
Contaminated Soil ◽  
Sandy Loam ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Soil Toxicity ◽  
Soil Flushing

AbstractRemoval of heavy metals (HMs) from soil is a priority in soil washing/soil flushing. However, for further management of remediated soil, it should be characterized in detail. This study presents, for the first time, an evaluation of soil quality after column flushing with new-generation washing agents (WAs) recovered from municipal sewage sludge (dissolved organic matter, DOM; soluble humic-like substances, HLS; soluble humic substances, SHS) and Na2EDTA as a standard benchmark. Sandy loam soil was spiked with industrial levels of Cu, Pb and Zn, then flushed in a column reactor at two WA flow rates (0.5 and 1.0 ml/min). Soil quality was assessed by determining both physico-chemical (pH, total HMs and their mobility, soil organic matter, OM, humic substances, HS and their fractions, macroelements) and biological indicators (dehydrogenase activity, DHA; germination rate, GR; and inhibition factors for roots and shoots of Triticum aestivum). Total residual HMs contents and HMs contents in the mobile fraction were significantly lower in soil flushed at 1.0 ml/min than in soil flushed at 0.5 ml/min. With all WAs, the decrease in Cu content was larger than that of the other HMs, however this HM most effectively was removed with DOM. In contrast, Pb most effectively was removed by HLS and Na2EDTA, and DOM should not be used to remediate Pb-contaminated soil, due to its very low effectiveness. Flow rate did not appear to affect the fertilizing properties of the soil, DHA activity or soil toxicity indicators. Soil flushing with all SS_WAs increased OM, HS, and exchangeable P, K and Na content in remediated soils, but decreased exchangeable Ca content, and in most cases, exchangeable Mg content. Soil flushing substantially improved DHA activity and GR, but only slightly improved the shoot and root inhibition factors.

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