Soil organic matter doubles the cation exchange capacity of tropical soil under no‐till farming in Brazil

Ramos, Fabrício Tomaz; Dores, Eliana Fg de Carvalho; Weber, Oscarlina Lúcia dos Santos; Beber, Daniel C; Campelo, José Holanda; Maia, João Carlos de Souza

doi:10.1002/jsfa.8881

Cited by 135 publications

(64 citation statements)

References 22 publications

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“…The results summarized in Table 1 are in agreement with those reported by Ramos et al (2018), as shown by the fact that the correlation detected in the present study between CEC and clay content (Pearson's r = 0.37, P < 0.000; n = 196) was mainly driven by the variation in organic matter content (Pearson's r = 0.76, P < 0.0001, n = 196). In contrast, the increase in H + Al content resulted in a decrease in buffer pH (Figure 2), which is consistent with the findings of previous studies (Almeida Júnior et al, 2015;Maeda et al, 1997;Quaggio;Van Raij;Malavolta, 1985;Toledo et al, 2012).…”

Section: Resultssupporting

confidence: 93%

Use of buffer methods to estimate the potential acidity of Mato Grosso soils

et al. 2020

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Mato Grosso, with a total area of 903357 km², does not have an official methodology for estimating soil potential acidity (H + Al), and determination of H + Al using the standard method is onerous and time consuming. The objective of this study was to compare estimated values of H + Al determined using the standard calcium acetate method with those obtained using three buffer methods, namely, the Shoemaker, McLean, and Pratt (SMP) buffer, Sikora buffer, and Santa Maria buffer (SMB) methods, with samples of the main classes of cultivated soils in the state of Mato Grosso. A total of 196 soil samples were collected from the arable layer (0-20 cm) in agropastoral and adjacent native systems. Statistical models were obtained and compared with models used by laboratories that are hypothetically inadequate because there is no calibration for soils in the state. After laboratory analyses, the paired H + Al and equilibrium pH values corresponding to the equilibrium of each buffer solution (SMP buffer, SMB, and Sikora buffer) were subjected to nonlinear regression analysis (P < 0.05). The SMB method, which does not release pollutant residues into the environment, was better than the Sikora and SMP methods for replacing the standard method used in state laboratories for soil analysis, that is, H + Al (cm3 c dm-3) = 51.189 -25.70 ln(pHSMB) (R2 = 0.88, P < 0.0001). Thus, if laboratories use uncalibrated equations to estimate soil potential acidity, the recommended limestone correction will be underestimated or overestimated, which may compromise crop productivity in Mato Grosso.

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Section: Resultssupporting

confidence: 93%

Use of buffer methods to estimate the potential acidity of Mato Grosso soils

et al. 2020

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“…In the United Kingdom, Johnston et al (2008) observed that the loss of SOM content can reduce the exchange of some essential plant nutrients (N, phosphorus [P], and sulfur [S]), and increase of SOM content can supply N, P, and S for plant growth (Johnston 1986). SOM content also affects nutrient supply by increasing the cation exchange capacity, especially in soils of the tropics (Ramos et al 2018). A severe loss of SOM can also lead to release of some toxic elements because of decline in chelation and adsorption capacity of soil (Griffiths et al 2005;Gregory et al 2015).…”

Section: Soil Organic Matter Contentmentioning

confidence: 99%

Soil organic matter content and crop yield

Lal¹

2020

Journal of Soil and Water Conservation

146

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“…In order to determine the total organic carbon stock (T OCS ) along the soil profile, the sampling was carried out according to the basic recommendations of the Intergovernmental Panel on Climate Change (IPCC, 2006), which recommends the individualization of homogeneous areas, with stratified collection at a minimum depth of 0.30 m. T OCS calculations were performed according to Ramos et al (2018), but for the present study, the gravel content was discounted to avoid errors that could cause the overestimation of T OCS , as the gravel is chemically inert, and is heavier than sand, silt, and clay particles.…”

Section: Source: Checoli (2012)mentioning

confidence: 99%

“…Thus, the soil must be able to sustain plant growth to allow the riparian zone to regenerate. Therefore, one of the ways to hypothetically verify regeneration is by determining the total soil organic carbon stock (T OCS ), as according to Ramos et al (2018), the T OCS is strongly and significantly correlated with several physical and chemical soil attributes that facilitate the development of plants.…”

Section: Introductionmentioning

confidence: 99%

Impact of Different Revegetation Techniques on Soil and Plant Attributes in a Riparian Zone1

et al. 2020

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In 2014, the Upper Paraguay River Basin (UPB) plateau in Brazil maintained only 39.5% of its native vegetation cover, most of which was located in riparian zones that were generally degraded, in legal reserve areas, or in regions without agricultural potential. Due to the lack of practical results in the region, so that farmers could base their projects for the recovery of degraded areas, this work was designed to determine the long-term result of three revegetation techniques and their contributions to soil attributes and vegetative parameters, in the riparian zone of a watershed in the municipality of Campo Verde, located in the UPB. It was found that in only seven years, the technique of distributing a mixture of seeds rich in nitrogen-fixing plant species with washed sand and composted cotton tow, followed by incorporation with light harrowing, favored a rapid establishment of native plants. In this case, the number of species and the floristic diversity was the closest to those of the Tropical Cerrado, i.e., the control. In this technique, Brachiaria brizantha was not dominant , and the mean of total organic carbon storage in the soil (TOCS) was significantly lower, thereby indicating that riparian zones with higher TOCS do not necessarily have greater plant diversity. Therefore, the competition caused by B. brizantha can affect ecological diversity in areas undergoing ecological succession.

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Soil organic matter doubles the cation exchange capacity of tropical soil under no‐till farming in Brazil

Cited by 135 publications

References 22 publications

Use of buffer methods to estimate the potential acidity of Mato Grosso soils

Use of buffer methods to estimate the potential acidity of Mato Grosso soils

Soil organic matter content and crop yield

Impact of Different Revegetation Techniques on Soil and Plant Attributes in a Riparian Zone1

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