Institutional landmarks in Brazilian research on soil erosion: a historical overview

Telles, Tiago Santos; Dechen, Sônia Carmela Falci; Guimarães, María de Fátima

doi:10.1590/s0100-06832013000600001

Cited by 11 publications

(4 citation statements)

References 9 publications

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“…The main consequences of erosion are losses of water, soil, OM, nutrients and the costs generated (Pimentel et al, 1995;Telles et al, 2011;Telles et al, 2013a). The study of this phenomenon is of utmost importance, since freshwater is a scarce natural resource and that the gradual losses of soil can turn it into an unproductive land (Pimentel et al, 1995;Lal, 1998;Den Biggelaar et al, 2003a, b).…”

Section: Introductionmentioning

confidence: 99%

Perdas e custos associados à erosão hídrica em função de taxas de cobertura do solo

et al. 2015

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The aim of this study was to estimate water erosion costs associated with nutrient losses in four different rates of artificial cover. The experiment was carried out from 1987 to 1996 in runoff plots to measure soil losses in Campinas, State of Sao Paulo, in an Ferralsol under natural rainfall. The experimental design was completely randomized, with four treatments (0%, 24%, 40% and 90% artificial cover) and three replications. To estimate costs, P, K + , Ca 2+ and Mg 2+ concentrations in runoff water and soil removed by erosion were summed up, converted into triple superphosphate, potassium chloride and dolomitic limestone and multiplied by their respective market prices. The results indicate that, under the experimental conditions, the greater the percentage of soil cover, the lower the losses of water, soil, organic matter and nutrients. The soil with 90% cover presented reduction of 51.97% in average water losses, 54.44 in soil losses and 54.91% in organic matter losses than the treatment with 0% cover. In bare soil, losses were estimated at 16% P 2 O 5 and 8% KCl in terms of the amount of fertilizers recommended. Costs varied from US$ 107.76 ha -1 year -1 in bare soil (0% cover) to US$ 18.15 ha -1 year -1 in soil with 90% cover. With these values, losses were estimated at 616.5 million tons of soil per year for Brazil, as a result of soil erosion in annual crops, and cost of this process is around US$ 1.3 billion per year.

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Section: Introductionmentioning

confidence: 99%

Perdas e custos associados à erosão hídrica em função de taxas de cobertura do solo

et al. 2015

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“…This fact highlights the importance of maintaining and preserving the topsoil, the most active soil layer and susceptible to degradation due to poor soil management. This shows the importance of NT in Brazil since its introduction in the 1970s, reducing and controlling erosion and the loss of soil, nutrients, and water (Telles et al 2013).…”

Section: Effect Of Tillage Systems On C Accumulationmentioning

confidence: 88%

Soil organic matter fractions in an Oxisol under tillage systems and winter cover crops for 26 years in the Brazilian subtropics

Conceição

Casali

Canalli³

et al. 2022

Bragantia

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The improvement of carbon (C) accumulation in soils has been one of the main purposes of the conservation systems in agricultural production. This study aimed to assess the long-term effect of conventional tillage (CT) and no-tillage (NT) combined with winter cover crops, black oat and oilseed radish, and fallow on C accumulation and stabilization in a very clayey Oxisol in Southern Brazil. Soil samples were collected in the 0-0.05, 0.05-0.10 and 0.10-0.20 m layers of a 26-year-old experiment. Distribution of size-class aggregates, C stock in aggregates, total C stock, and C stocks in the physical fractions, free particulate organic matter (free-POM), occluded particulate organic matter (occluded-POM) and mineral-associated organic matter (min-OM) were assessed. NT had a higher percentage of macroaggregates and C stock in this size-class, and also higher C stock in bulk soil, free-POM and occluded-POM fractions than CT in 0-0.05 m (Tukey's test p < 0.05), due to higher input of biomass and minimum soil mobilization in NT. Oat and radish had higher C stock in macroaggregates than fallow in 0.05-0.10 m (Tukey's test p < 0.05). Radish had the highest C stock in the free-POM (0-0.05 m). Fallow decreased the stabilization of macroaggregates and C accumulation in free-POM, due to the lower C input from aboveground biomass over the years. In conclusion, NT after 26 years improved C accumulation and stabilization, mainly in the superficial layer and in POM fractions, and winter cover crops favored the formation and stability of macroaggregates.

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“…Brazil has pioneered the development and use of soil conservation techniques in tropical regions, especially in terms of no-tillage (NT) practices that are so important for conserving and improving the country's soil and water resources (Telles et al, 2013;Derpsch et al, 2014;Deuschle et al, 2019). No-tillage has been implemented on over 32 million hectares (Fuentes-Llanillo et al, 2021), producing about 60 % of the country's annual crops (IBGE, 2019).…”

Section: Introductionmentioning

confidence: 99%

Soil management practices adopted by farmers and how they perceive conservation agriculture

Telles¹,

Melo²,

Righetto³

et al. 2022

Revista Brasileira De Ciência Do Solo

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In some rural properties of Brazil, soil and water conservation practices are partially or inappropriately implemented, intensifying soil erosion, even in no-tillage (NT) areas. This study aimed to check the farmer's understanding of conservation agriculture (CA) and assess whether they are using practices appropriate to soil conservation. A basin in the state of Paraná, in Southern Brazil, was selected. Surveys were conducted based on a structured questionnaire and in-person interviews of 234 farmers. Among these farmers, 67 % do not understand CA pillars adequately, and 68 % stated they have been using NT for over 12 years. However, 58 % stated that they carried out some kind of soil preparation. Furthermore, some of the farmers only partially implemented CA, adopting a low level of crop diversification. The main problems pointed out by the farmers to justify simplifying the CA approach were soil compaction, low production of plant biomass and resistance of weeds to herbicides. Most farmers in the study do not have enough knowledge of the pillars of CA. As a result, there is little diversification in crop rotation, and the soil is continually disturbed with chiseling. Furthermore, although most farmers use terracing, they drive sprayers crossing terraces and following the slope, a practice that can impair the capacity of terraces to control surface water runoff. These practices do not contribute to soil and water conservation and endanger the sustainability of agricultural production systems.

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Institutional landmarks in Brazilian research on soil erosion: a historical overview

Abstract: SUMMARY

Cited by 11 publications

References 9 publications

Perdas e custos associados à erosão hídrica em função de taxas de cobertura do solo

Perdas e custos associados à erosão hídrica em função de taxas de cobertura do solo

Soil organic matter fractions in an Oxisol under tillage systems and winter cover crops for 26 years in the Brazilian subtropics

Soil management practices adopted by farmers and how they perceive conservation agriculture

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