Role of sulphate in affecting soil availability of exogenous selenate  (SeO42-) under different statuses of soil microbial activity

We investigated sulphate application, different statuses of soil microbial activity and their joint effects as variables associated with changes in potentially plant-available selenium (Seppa) and soil Se fractionation during the course of an incubation study. The time-resolved behaviour of added selenate (400 µg Se/kg as Na2SeO4) in two agricultural soils was elucidated by means of single extraction (50 mmol/L NH4H2PO4), sequential extraction procedure (SEP) and chemical speciation analysis in phosphate extracts. The decrease in phosphate-extractable Se, a consequence of soil aging, was inhibited by sulphate (by 34% and 29% in Chernozem and Cambisol, respectively) and by gamma-irradiation (by 46% and 20% in Chernozem and Cambisol, respectively) after 72 days of incubation as compared to the control treatments. Glucose amendment dramatically decreased Seppa only in the Chernozem. After 1 year, the initial soil treatment with respect to inhibited or stimulated microbially-mediated processes substantially controlled the distribution pattern of exogenous Se as observed using the SEP. Application of sulphur fertilisers and sources of labile organic matter is thus an essential agronomic practice to correct unfavourable amounts of Seppa.

Download Full-text

Soil microbial activity and hairy beggarticks’ germination after application of crude glycerin

Revista CERES ◽

10.1590/0034-737x201764020007 ◽

2017 ◽

Vol 64 (2) ◽

pp. 151-158

Author(s):

Matheus Ramos Caixeta ◽

Saul Jorge Pinto de Carvalho ◽

Poliana Coste e Colpa ◽

Márcio Donizetti de Andrade ◽

Breno Régis Santos

Keyword(s):

Microbial Activity ◽

Plant Development ◽

Agricultural Soils ◽

Block Design ◽

Soil Microbial Activity ◽

Crude Glycerin ◽

Soil Microbial ◽

Randomized Design ◽

Randomized Complete Block Design ◽

By Products

ABSTRACT Biodiesel stands out as an alternative for petroleum-based products, but its production generates a large amount of by-products. This study was carried out at the Instituto Federal de Educação, Ciência e Tecnologia do Sul de Minas Gerais, Campus Machado, with the objective of evaluating the impacts of the disposal of crude glycerin on agricultural soil and its microbial activity as well as in plant development. An experiment with a completely randomized design, five treatments, and five replicates was developed in the laboratory to analyze microbial activity. Soil samples of 100 g were incubated for 36 days with concentrations of crude glycerin, namely: 0; 48.7; 146.1; 292.2 L ha-1. Besides these four treatments, flasks without soil and glycerin have composed one more treatment. During this period, the CO2 volume released in each sample was evaluated 11 times. Another experiment was developed in the laboratory with hairy beggarticks’ achenes to evaluate crude glycerin effects on plant development. A randomized complete block design was used in a 4x2 factorial scheme, with five replicates, the same glycerin concentrations, and two glycerin sources (laboratory and biodiesel plant-unit). Crude glycerin stimulated soil microbial activity for doses of up to 143.83 L ha-1, being a positive indicative for future studies on its application to agricultural soils. Glycerin applications reduced the hairy beggarticks’ root protrusion, even at the lowest doses. Residues have Na+ contents that limit their application in agricultural soils.

Download Full-text

Effect of Water Potential, Temperature, and Soil Microbial Activity on Release of Starch‐Encapsulated Atrazine and Alachlor

Journal of Environmental Quality ◽

10.2134/jeq1992.00472425002100030013x ◽

1992 ◽

Vol 21 (3) ◽

pp. 382-386 ◽

Cited By ~ 15

Author(s):

Brian J. Wienhold ◽

Timothy J. Gish

Keyword(s):

Water Potential ◽

Microbial Activity ◽

Potential Temperature ◽

Soil Microbial Activity ◽

Soil Microbial ◽

Effect Of Water

Download Full-text

Carbon limitation overrides acidification in mediating soil microbial activity to nitrogen enrichment in a temperate grassland

Global Change Biology ◽

10.1111/gcb.15819 ◽

2021 ◽

Author(s):

Qiushi Ning ◽

Stephan Hättenschwiler ◽

Xiaotao Lü ◽

Paul Kardol ◽

Yunhai Zhang ◽

...

Keyword(s):

Microbial Activity ◽

Soil Microbial Activity ◽

Temperate Grassland ◽

Carbon Limitation ◽

Nitrogen Enrichment ◽

Soil Microbial

Download Full-text

Effects of Monoculture, Crop Rotation, and Soil Moisture Content on Selected Soil Physicochemical and Microbial Parameters in Wheat Fields

Applied and Environmental Soil Science ◽

10.1155/2012/593623 ◽

2012 ◽

Vol 2012 ◽

pp. 1-13 ◽

Cited By ~ 7

Author(s):

A. Marais ◽

M. Hardy ◽

M. Booyse ◽

A. Botha

Keyword(s):

Soil Moisture ◽

Microbial Communities ◽

Crop Rotation ◽

Management Practices ◽

Agricultural Soils ◽

Soil Microbial Communities ◽

Soil Microbial Activity ◽

Most Probable Number ◽

Probable Number ◽

Soil Microbial

Different plants are known to have different soil microbial communities associated with them. Agricultural management practices such as fertiliser and pesticide addition, crop rotation, and grazing animals can lead to different microbial communities in the associated agricultural soils. Soil dilution plates, most-probable-number (MPN), community level physiological profiling (CLPP), and buried slide technique as well as some measured soil physicochemical parameters were used to determine changes during the growing season in the ecosystem profile in wheat fields subjected to wheat monoculture or wheat in annual rotation with medic/clover pasture. Statistical analyses showed that soil moisture had an over-riding effect on seasonal fluctuations in soil physicochemical and microbial populations. While within season soil microbial activity could be differentiated between wheat fields under rotational and monoculture management, these differences were not significant.

Download Full-text