Relationships between labile soil organic carbon fractions under different soil management systems

Souza, Géssica Pereira de; Figueiredo, Cícero Célio de; Sousa, D. M. G. de

doi:10.1590/0103-9016-2015-0047

Cited by 32 publications

(7 citation statements)

References 25 publications

(34 reference statements)

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“…For better understanding of OM complexity and the dynamics of its changes in soil, the OM fractions should be analysed separately [61]. In the present study, the soil management practices significantly affected the content of the POM fraction in soil at p ≤ 0.05 ( Figure 3).…”

Section: Effects On Particle Organic Mattermentioning

confidence: 89%

Comparison of the Effects of Different Crop Production Systems on Soil Physico-Chemical Properties and Microbial Activity under Winter Wheat

2020

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In many areas, organic crop production systems have been shown to contribute to maintaining good soil condition. The organic production system has been recommended as an alternative to conventional agriculture. However, in order to recommend this practice in new regions, it is necessary to obtain information about its effects and consequences in local environmental conditions. The research was completed during 2016–2018 in Osiny (Lublin region, Poland) on a field experiment established 26 years previously in a Haplic Luvisol soil. The research was aimed at comparing the effects of long-term use of tilled soil with organic (ORG) and conventional (CON) crop production systems with those in non-tilled soil under permanent grass (PRG) as a control. This comparison was done on the basis of changes in the values of soil properties as follows: Total porosity (TP), total organic matter (OM), particulate organic matter (POM), humic substances (HS), water-extractable carbon (WEC), microbial biomass carbon pool (MBC) and dehydrogenase activity (DH). Soil samples were collected from experimental fields (each treatment 1 ha) under winter wheat and permanent grass each year from 0–5, 5–10, 15–20 and 30–35 cm depths. Over the three year study period, it was found that permanent grass and the organic crop production system contributed to increased soil OM, POM, HS, WEC and MBC contents and DH activity compared to the CON system, especially in the top soil layer, 0–5 cm. To obtain a clearer picture of soil quality change our study examined for the first time the metabolic potential index (MPI) as a ratio of dehydrogenase activity to the soluble organic carbon content. The MPI values confirmed the increase of metabolism in ORG soil as a consequence of management practices compared with CON soil. The obtained correlations showed strong mutual relationships within properties of the heterogeneous soil complex. The results show the positive effects of the ORG management system causing soil condition improvement which is based on organic fertilization, enriching the soil with a large amount of plant residues in creating positive changes in the soil quality in contrast to the CON system.

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Section: Effects On Particle Organic Mattermentioning

confidence: 89%

Comparison of the Effects of Different Crop Production Systems on Soil Physico-Chemical Properties and Microbial Activity under Winter Wheat

2020

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“…1a). This can be ascribed to the widely acknowledged benefits of this system, such as accumulation of organic matter (Souza et al, 2016) and soil organic phosphorus (Rodrigues et al, 2016), higher levels of inorganic labile P fractions (Nunes, 2014; Tiecher et al, 2017) resulting from lower exposure to new adsorption sites (Sousa and Volkweiss, 1987), higher biological activity (Mbuthia et al, 2015; Souza et al, 2016) and improved physical properties (Calonego et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Response of Maize to Different Soil Residual Phosphorus Conditions

et al. 2019

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Large reserves of phosphorus (P) in Brazilian soils can be potentially used by crops. However, it is not well known how different tillage systems and past P fertilizer management strategies affect legacy P utilization. A trial was conducted in an Oxisol (Rhodic Haplustox) at Embrapa Cerrados, Federal District, Brazil to investigate the effects of different soil residual P conditions on maize yield. For 17 yr, annual summer crops were fertilized with 80 kg ha−1 yr−1 P2O5 in a split‐plot design consisting of eight treatments: no‐tillage system (NT) or conventional tillage (CT), fertilized with triple superphosphate (TSP) or reactive rock phosphate (RRP), applied to the crop furrow or broadcast. P fertilization was then discontinued and maize grown for 4 seasons relied on the residual soil P under NT or CT. Residual P use efficiency, calculated as a ratio between grain yield and total residual P in the soil, was greater under NT than CT, as a consequence of higher availability of P determined by Bray‐1, Mehlich‐1 and Olsen methods. Past use of RRP sustained better yields and higher residual P use efficiency, especially in NT, due to its lower solubilizing rate. P placement strategy did not change residual P use efficiency. We recommend assess amount of available P to identify sites in which residual P may sustain crop needs. Finally, the use of RRP, especially under NT, is a recommended management strategy for reducing phosphate fertilizer demand in heavily weathered soils of Central Brazil. Core Ideas No‐tillage system promotes efficient P use, especially after discontinued P supply. Due to slow solubilizing rate, reactive rock phosphate sustains better residual P availability. Fertilizer placement did not influence residual P use efficiency.

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“…Likewise, it is the main agent of SOM decomposition, transforming nutrients and making them available [52], which may explain the high content of MBC and the low percentages of SOM in pecan orchards under Org management. In contrast, it has been shown that the F2 fraction has a high rate of decomposition and a shorter residence time in the soil [53], thus responding to Conv management by releasing carbon into the atmosphere in the form of CO 2 , causing losses of nutrients and soil fertility [54]-contrary to what happens in soil Org management [55,56]. On the other hand, organic materials with a low degree of humification, i.e., labile, increase the HA and FA fractions [57,58].…”

Section: Chemical and Biological Variables Of The Soilmentioning

confidence: 96%

Effect of Organic and Conventional Systems Used to Grow Pecan Trees on Diversity of Soil Microbiota

et al. 2020

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Agronomic management modifies the soil bacterial communities and may alter the carbon fractions. Here, we identify differences in several chemical and biological soil variables, as well as bacterial composition between organic (Org) and conventional (Conv) agronomic management in pecan (Carya illinoinensis) orchards located in Coahuila, Mexico. The analyzed variables were pH, N, P, K, soil organic matter, organic matter quality, soil organic carbon, C/N ratio, carbon fractions, microbial biomass carbon, easily extractable Glomalin, colony-forming units, CO2 emissions, and the enzyme activity. The DNA of soil bacteria was extracted, amplified (V3-V4 16S rRNA), and sequenced using Illumina. To compare variables between agronomic managements, t tests were used. Sequences were analyzed in QIIME (Quantitative Insights Into Microbial Ecology). A canonical correspondence analysis (CCA) was used to observe associations between the ten most abundant phyla and soil variables in both types of agronomic managements. In Org management, variables related to the capture of recalcitrant carbon compounds were significant, and there was a greater diversity of bacterial communities capable of promoting organic carbon sequestration. In Conv management, variables related to the increase in carbon mineralization, as well as the enzymatic activity related to the metabolism of labile compounds, were significant. The CCA suggested a separation between phyla associated with some variables. Agronomic management impacted soil chemical and biological parameters related to carbon dynamics, including bacterial communities associated with carbon sequestration. Further research is still necessary to understand the plasticity of some bacterial communities, as well as the soil–plant dynamics.

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Relationships between labile soil organic carbon fractions under different soil management systems

Cited by 32 publications

References 25 publications

Comparison of the Effects of Different Crop Production Systems on Soil Physico-Chemical Properties and Microbial Activity under Winter Wheat

Comparison of the Effects of Different Crop Production Systems on Soil Physico-Chemical Properties and Microbial Activity under Winter Wheat

Response of Maize to Different Soil Residual Phosphorus Conditions

Effect of Organic and Conventional Systems Used to Grow Pecan Trees on Diversity of Soil Microbiota

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