No isotopic evidence for a differential mineralization of old soil organic matter in sandy, nutrient-poor, tropical soils under eucalypts and acacias

2016 ◽  
Vol 76 ◽  
pp. 92-94
Author(s):  
Daniel Epron ◽  
Sogni Viviane Tchichelle ◽  
Yann Nouvellon ◽  
Louis Mareschal ◽  
Lydie-Stella Koutika
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Tropical Soils ◽  
Isotopic Evidence

Sulfur forms in bulk soils and alkaline soil extracts of tropical mountain ecosystems in northern Thailand

Soil Research ◽  
2002 ◽  
Vol 40 (1) ◽  
pp. 161 ◽  
Author(s):  
A. Möller ◽  
K. Kaiser ◽  
N. Kanchanakool ◽  
C. Anecksamphant ◽  
W. Jirasuktaveekul ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Tropical Soils ◽  
Forest Site ◽  
Alkaline Soil ◽  
Northern Thailand ◽  
Total N ◽  
Soil Extracts ◽  
Organic C ◽  
Organic S

Sulfur, besides phosphorus, is crucial for the nutrition of plants on tropical soils. Its availability is closely related to the turnover of soil organic matter. To get a better insight into transformation of soil S forms during the decomposition of organic matter, we studied inorganic and organic S pools in bulk samples and alkaline extracts of soils under different land uses representative of the tropical highlands of northern Thailand. Samples were taken from a cabbage cultivation, a Pinus reforestation, a secondary forest, and a primary forest. Total S ranged from 483 549 mg/kg in the subsoil to 1909 376 mg/kg in the organic layers, which is relatively high for tropical soils. The major S component in soil was organic S, comprising 75–99% of total S. Organic S was significantly correlated with total S, organic C, and total N, indicating that there is a close relationship between C, N, and S cycling in soil. C-bonded S was the predominant form in the topsoils (35–99% of total S) but its presence decreased with soil depth. The maximum concentrations of ester SO4-S were found in the A horizons (128 49 mg/kg), whereas the concentrations of inorganic SO4-S were small in all horizons. Compared with the forest site, the cabbage cultivation site was strongly depleted in S. C-bonded S was more depleted than ester SO4-S. A comparison of the S forms in NaOH extracts with S forms in bulk soil and C forms as indicated by 13C-NMR spectroscopy showed (i) that the extracts were very representative of soil organic S fractions and (ii) that ester SO4-S was mainly associated with O-substituted aliphatic C. In contrast, C-bonded S seemed to be connected to more-or-less all C binding types. transformation of soil organic matter, sulfate.

A routine method to study soil organic matter by particle‐size fractionation: Examples for tropical soils

1995 ◽  
Vol 26 (11-12) ◽  
pp. 1749-1760 ◽  
Author(s):  
E. Gavinelli ◽  
C. Feller ◽  
M.C. Larré‐Larrouy ◽  
B. Bacye ◽  
N. Djegui ◽  
...  
Keyword(s):  
Particle Size ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Tropical Soils ◽  
Routine Method ◽  
Size Fractionation ◽  
Particle Size Fractionation

scholarly journals Short-Term Changes in Fertility Attributes and Soil Organic Matter Caused by the Addition of EM Bokashis in Two Tropical Soils

2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Carlos Eduardo Pacheco Lima ◽  
Mariana Rodrigues Fontenelle ◽  
Luciana Rodrigues Borba Silva ◽  
Daiane Costa Soares ◽  
Antônio Williams Moita ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Organic Carbon ◽  
Total Organic Carbon ◽  
Poultry Manure ◽  
Principal Component ◽  
Tropical Soils ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Chemical Attributes

The present work aimed to evaluate the behavior of ten fertility attributes of soil organic matter physical fractions and total organic carbon upon addition of three EM Bokashis to a Rhodic Ferralsol (FRr) and a Dystric Cambisol (CMd). An experiment was carried out in greenhouse in which the soils were placed into plastic trays and cultivated with tomato. A completely randomized design was used with four repetitions and factorial scheme of 2 × 3 + 2, consisting of two soils (FRr and CMd), three EM Bokashis (Poultry Manure Bokashi (BPM); CNPH Bokashi (BC); and Cattle Manure Bokashi (BCM)), and two controls (both soils without addition of Bokashi). The following fertility attributes were evaluated: pH, Ca2+, Mg2+, K+, Na+, P, SB, H + Al, CEC, andV. Particulate organic carbon (POC) and mineral-associated organic carbon (MOC) and total organic carbon (TOC) were also investigated. Finally, the Principal Component Analysis was conducted in order to identify possible patterns related to soils when fertilized with EM Bokashi. The addition of EM Bokashi increased the soil fertility and contents of POC. Different EM Bokashi presents distinguished effects on each soil. The PCA suggests that BPM presents higher capacity to modify the analyzed chemical attributes.

scholarly journals Analysis of soil organic matter in tropical soils with near-infrared spectroscopy (NIRS) and chemometrics

2012 ◽  
Vol 39 (2) ◽  
pp. 387-394
Author(s):  
Aarón Jarquín-Sánchez ◽  
Sergio Salgado-García ◽  
David J Palma-López ◽  
Wilder Camacho-Chiu
Keyword(s):  
Organic Matter ◽  
Infrared Spectroscopy ◽  
Soil Organic Matter ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Tropical Soils

Soil organic matter, biota and aggregation in temperate and tropical soils - Effects of no-tillage

Agronomie ◽  
2002 ◽  
Vol 22 (7-8) ◽  
pp. 755-775 ◽  
Author(s):  
Johan Six ◽  
Christian Feller ◽  
Karolien Denef ◽  
Stephen M. Ogle ◽  
Joao Carlos de Moraes ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Tropical Soils ◽  
No Tillage

scholarly journals Gravimetric determination of soil organic matter

2000 ◽  
Vol 43 (5) ◽  
pp. 475-478 ◽  
Author(s):  
M. Miyazawa ◽  
M.A. Pavan ◽  
E.L. de Oliveira ◽  
M. Ionashiro ◽  
A.K. Silva
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Gravimetric Method ◽  
Tropical Soils ◽  
Angular Coefficient ◽  
Variable Chemical ◽  
Temperate Soils ◽  
Concentrated Sulfuric Acid ◽  
The Difference

Studies were carried out to evaluate a gravimetric method for the determination of soil organic matter by the mass loss at 300ºC. The gravimetric method was compared with Walkley-Black, using several brazilian soils with variable chemical and physical properties. Gravimetric method was positively correlated with Walkley-Black method with the following linear regression equation: y = 3.72x + 0.29, r = 0.94. The angular coefficient 3.72 for tropical soils was greater than those reported in the literature for temperate soils (from 1.68 to 2.13). The difference was due to greater oxidation degree of the organic matter. When compared with Walkley-Black method, gravimetric technique showed certain distinct advantages such as no environmental contamination with Cr6+ and improved laboratory safety eliminating the use of concentrated sulfuric acid.

scholarly journals Prediction of soil organic matter content by combining data from Nix ProTM color sensor and portable X-ray fluorescence spectrometry in tropical soils

2022 ◽  
Vol 28 ◽  
pp. e00461
Author(s):  
Alvaro José Gomes de Faria ◽  
Sérgio Henrique Godinho Silva ◽  
Renata Andrade ◽  
Marcelo Mancini ◽  
Leônidas Carrijo Azevedo Melo ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Organic Matter Content ◽  
Tropical Soils ◽  
Matter Content ◽  
Fluorescence Spectrometry ◽  
Soil Organic Matter Content ◽  
X Ray ◽  
Color Sensor ◽  
Combining Data

scholarly journals Stabilized Organic Matter Quantities May Strongly Affect the Mobility of Glyphosate into Soil

2016 ◽  
Vol 8 (9) ◽  
pp. 135 ◽  
Author(s):  
Paulo Roberto Dores-Silva ◽  
Fernanda Benetti ◽  
Bruno Molero Silva ◽  
Maria Diva Landgraf ◽  
Maria Olímpia Oliveira Rezende
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Humic Substances ◽  
Acid Medium ◽  
Interaction Mechanism ◽  
Tropical Soils ◽  
Water Bodies ◽  
Adsorption Potential ◽  
The World

<p>Glyphosate [N-(phosphonomethyl) glycine] is an enzyme inhibiting herbicide, which is widely used in the world. Here, we investigate the glyphosate adsorption potential in tropical soils with pH close to 5. The herbicide was determined via HPLC with detection by UV-Vis. Our results suggest that glyphosate interacts especially with the stabilized organic matter. Thus, even with large amounts of soil organic matter, the soils may not be as effective in the adsorption of the herbicide if they do not also possess high percentage of humic substances. These data are worth far as it allows us to speculate on glyphosate interaction mechanism with the humic substances in slightly acid medium, in addition, also enable us to propose the use of that fraction of the organic matter to immobilize part of the herbicide in the soil and inhibiting its leaching into water bodies.</p>

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