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Registros recuperados: 68
Primeira ... 1234 ... Última
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Pedotransfer functions to estimate proctor test parameters under different tillage systems Rev. Bras. Ciênc. Solo
Álvarez,Carina Rosa; Micucci,Federico Guillermo; Bustingorri,Carolina; Taboada,Miguel Angel.
The Proctor test is time-consuming and requires sampling of several kilograms of soil. Proctor test parameters were predicted in Mollisols, Entisols and Vertisols of the Pampean region of Argentina under different management systems. They were estimated from a minimum number of readily available soil properties (soil texture, total organic C) and management (training data set; n = 73). The results were used to generate a soil compaction susceptibility model, which was subsequently validated using a second group of independent data (test data set; n = 24). Soil maximum bulk density was estimated as follows: Maximum bulk density (Mg m-3) = 1.4756 - 0.00599 total organic C (g kg-1) + 0.0000275 sand (g kg-1) + 0.0539 management. Management was equal to 0 for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil organic carbon; Soil compaction; Soil texture.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000600002
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Influence of inorganic and organic fertilization on microbial biomass carbon and maize yield in two soils of contrasting pH Agrociencia
Arrieche-Luna,Elena; Ruiz-Dager,Magaly.
Inappropriate soil management practices that have been applied in the Yafacuy River basin, Venezuela, have led to the loss of soil organic matter and crop productivity. The incorporation of composted organic residues has been suggested as an alternative management practice in order to increase organic matter (OM) content and crop yield in these soils. The objective of this study was to determine the effects of different application fates of an organic fertilizer obtained from sugarcane industry wastes, filter cake and bagasse with or without inorganic fertilizers, on microbial biomass carbon (MB-C), soil organic carbon (SOC), maize (Zea mays L.) yield and N, P, K content in the maize leaves, in Yafacuy River basin. The experiments were established in an...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Maize yield; Organic fertilization; Soil microbial biomass carbon; Soil organic carbon; Sugar cane filter cake.
Ano: 2010 URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952010000300001
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Variabilidade de carbono no solo sob sistema agroflorestal de base agroecológica. Repositório Alice
AZEVEDO, R. M. de; RAMOS FILHO, L. O.; MORICONI, W.; RAMOS, N. P.; ANDRADE, C. A. de.
Resumo: Protocolos para quantificação e monitoramento do estoque de carbono (C) no solo vêm sendo desenvolvidos para diversas culturas e sistemas de produção, mas pouco se conhece sobre a variabilidade desses estoques em sistemas agroflorestais. O objetivo da pesquisa foi caracterizar a variabilidade dos teores de C e nitrogênio (N) de camadas superficiais de um solo (0-5, 5-10, 10- 20 e 20-30 cm) sob sistema agroflorestal de base agroecológica, instalado em 2009 na Embrapa Meio Ambiente, em Jaguariúna-SP. A amostragem do Latossolo Vermelho-Amarelo distrófico, de textura argilosa (48% argila e 10% silte) foi realizada a partir de oito trincheiras abertas aleatoriamente, nas linhas das espécies arbóreas, combinadas com o cultivo de adubo verde, Panicum...
Tipo: Anais e Proceedings de eventos Palavras-chave: Agroecologia; Carbono; Solo; Agrossilvicultura; Soil organic carbon; Soil organic matter; Agroforestry.
Ano: 2020 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1126390
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Soil organic carbon determination using NIRS: evaluation of dichromate oxidation and dry combustion analysis as reference methods in multivariate calibration. Repositório Alice
BELTRAME, K. K.; SOUZA, A. M. de; COELHO, M. R.; WINKLER, T. C. B.; SOUZA, W. E.; VALDERRAMA, P..
Dichromate oxidation and dry combustion analysis were evaluated as reference methods to determine organic carbon in Brazilian soils using near infrared spectroscopy (NIRS) as an alternative. The main objective of this study was to evaluate which of the reference methods could provide a calibration model with higher predictive ability. A total of 161 soil samples obtained from horizons in full profiles (Parque Estadual da Mata Seca, Minas Gerais State, Brazil) were used. Models were mean centered and built from partial least squares. The dichromate oxidation method presented a lower accuracy when compared to dry combustion analysis as reference for NIRS. Figures of merit such as sensitivity, analytical sensitivity, detection and quantification limits,...
Tipo: Artigo de periódico Palavras-chave: Carbono; Análise do Solo; Soil organic carbon; Soil analysis.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1094899
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Frações granulométricas e oxidáveis da matéria orgânica do solo em sucessão floresta - pastagem no Acre. Repositório Alice
BERNINI, T. A.; LOSS, A.; PEREIRA, M. G.; COUTINHO, F. S.; ZATORRE, N. P.; WADT, P. G. S..
A conversão de floresta nativa em pastagem provoca mudanças no conteúdo das frações da matéria orgânica do solo (MOS). O objetivo deste trabalho foi avaliar as alterações ocorridas nas frações granulométricas e oxidáveis da MOS em Sucessão Floresta - Pastagem no Acre. Após a derrubada e queima da floresta, implantou-se a pastagem de braquiária. Nas duas áreas foram coletadas amostras de solo nas profundidades de 0-5 e 5-10 cm. Nestas, foram avaliados os conteúdos de carbono orgânico total (COT), carbono orgânico particulado (COp), carbono orgânico associado aos minerais (COam) e carbono das frações oxidáveis (F1, F2, F3 e F4). Verificou-se que, independente da profundidade, os maiores valores de COT, COp e carbono na F1 e F3 foram encontrados na área de...
Tipo: Parte de livro Palavras-chave: Granulometry; Conversão floresta-pastagem; Floresta ombrófila aberta; Manoel Urbano (AC); Acre; Amazônia Ocidental; Oxidación; Materia orgánica del suelo; Carbono orgánico del suelo; Cambio de uso de la tierra; Bosques lluviosos; Pastizales; Pastos forrajeros.; Uso da terra; Manejo do solo; Floresta; Pastagem; Granulometria; Matéria orgânica; Carbono; Oxidação; Gramínea forrageira; Capim Brachiária; Brachiaria brizantha; Bambu; Bambusa spp; Land use change; Rain forests; Pastures; Soil organic matter; Soil organic carbon; Oxidation; Forage grasses..
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/657774
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Successional patterns along soil development gradients formed by glacier retreat in the Maritime Antarctic, King George Island RChHN
Boy,Jens; Godoy,Roberto; Shibistova,Olga; Boy,Diana; McCulloch,Robert; la Fuente,Alberto Andrino de; Morales,Mauricio Aguirre; Mikutta,Robert; Guggenberger,Georg.
BACKGROUND: Maritime Antarctica is severely affected by climate change and accelerating glacier retreat forming temporal gradients of soil development. Successional patterns of soil development and plant succession in the region are largely unknown, as are the feedback mechanisms between both processes. Here we identify three temporal gradients representing horizontal and vertical glacier retreat, as well as formation of raised beaches due to isostatic uplift, and describe soil formation and plant succession along them. Our hypotheses are (i) plants in Antarctica are able to modulate the two base parameters in soil development, organic C content and pH, along the temporal gradients, leading to an increase in organic carbon and soil acidity at relatively...
Tipo: Journal article Palavras-chave: Temporal gradients; Chronosequences; Soil succession; Soil organic carbon; Ornithic; Mycorrhiza; Maritime Antarctica; King George Island.
Ano: 2016 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100007
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Fertilidade e carbono orgânico do solo em sistemas agroflorestais de duas décadas compostos de castanheira, cupuaçuzeiro e pupunheira na Amazônia Ocidental. Repositório Alice
BUTZKE, A. G.; OLIVEIRA, T. K. de; PAULA, A. E. B. de; FIUZA, S. da S..
A Floresta Amazônica vem sendo substituída por diversos sistemas de uso, como pastagens e variados usos agrícolas. O objetivo deste estudo foi avaliar o efeito da implantação do sistema agroflorestal (SAF) na Amazônia sobre atributos químicos do solo em três SAFs, compostos por castanheira, cupuaçuzeiro e pupunheira, sendo o SAF A analisado aos 4 e 19 anos, o SAF B aos 7 e 22 anos, e o SAF C aos 6 e 21 anos após a implantação. Foram avaliados os teores de P, Ca2+, Mg2+, K+ , H+Al, pH, SB, CTC, V% e carbono orgânico total. O delineamento experimental foi em blocos ao acaso, em esquema de parcelas subdivididas, com dois tempos, constituídos da primeira e segunda coletas nas parcelas e três profundidades, sendo de 0-20, 20-40 e 40-60 cm nas subparcelas,...
Tipo: Artigo de periódico Palavras-chave: Sistema agroflorestal (SAF); Carbono orgânico; Agroforestería; Fertilidad del suelo; Carbono orgánico del suelo; Nova Califórnia (RO); Rondônia; Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Fertilidade do Solo; Castanha do Para; Bertholletia Excelsa; Cupuaçu; Theobroma Grandiflorum; Pupunha; Bactris Gasipaes; Agroforestry; Soil fertility; Soil organic carbon.
Ano: 2020 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1125320
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Trees improve soil carbon stocks in integrated crop-livestock-forestry (ICLF) systems. Repositório Alice
CARVALHO, M. T. de M.; FAUSTINO, L. L.; ARAÚJO, W. A. de; PACHECO, A. R.; TROGELLO, E.; OLIVEIRA, S. M. de; MACHADO, P. L. O. de A.; SIQUEIRA, M. M. de B.; SILVA, R. R. da; LIMA, J. A..
Soil organic carbon (SOC, determined with dichromate oxidation) accumulation was evaluated at three ICLF sites of different ages (2, 4 and 11 years) and soil textures (469, 198, 632 g kg-1 clay) in southern Goiás state of Brazil. SOC stocks were accessed at 0-30, 30-100 and 0-100 cm soil layers under the tree-rows and between tree-rows. SOC stocks were calculated based on equivalent soil mass, using pasture, in which the ICLFs were implemented, as reference. Our objective was to investigate the potential of trees in accumulating SOC in ICLFs. Dunnett?s test was applied to check the effect of trees on soil C stocks within each location using the linear mixed model. More SOC was measured under tree-rows at all sites and all soil layers, compared to the alley...
Tipo: Parte de livro Palavras-chave: Neotropical savanna; Integração lavoura-pecuária-floresta; Cerrado; Carbono; Soil organic carbon; Savanna soils.
Ano: 2021 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1134895
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Use of VIS-NIRS for land management classification with a support vector machine and prediction of soil organic carbon and other soil properties Ciencia e Investigación Agraria
Debaene,Guillaume; Pikuła,Dorota; Niedźwiecki,Jacek.
The objective of this research was to investigate the effects of a long-term experiment on soil spectral properties and to develop prediction models of these properties (soil organic carbon (SOC), N, pH, Hh, P2O5, K2O, Ca, Mg, K, and Na content) from texturally homogeneous samples (loamy sand). To this aim, chemometric techniques, such as partial least square (PLS) regression and support vector machine (SVM) classification, were used. Our results show that visible and near infrared spectroscopy (VIS-NIRS) is suitable for the prediction of properties of texturally homogeneous samples. The effects of fertilizer applications were sufficient to modify the soil chemical composition to a range suitable for using VIS-NIRS for calibration and modeling purposes....
Tipo: Journal article Palavras-chave: Manure; Near-infrared spectroscopy; Nitrogen fertilizer; Partial least square regression; Soil organic carbon; Support Vector Machine.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000100003
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Cover crops affect on soil organic matter fractions under no till system. Repositório Alice
ENSINAS, S. C.; SERRA, A. P.; MARCHETTI, M. E.; SILVA, E. F. da; PRADO, E. A. F. do; LOURENTE, E. R. P.; ALTOMAR, P. H.; POTRICH, D. C.; MARTINEZ, M. A.; CONRAD, V. do A.; JESUS, M. V.; EL KADRI, T. C..
The purpose of this research was to identify the soil organic matter (SOM) fractions changes in a crop rotation system under no-till system (NTS). This research was carried out from October 2010 to February 2014 in a Rhodic Hapludox. The experiment was set up in completely randomized blocks in a factorial design with eight cover crops and three soil depths (0-5, 5-10 and 10-20 cm) with four repetitions. Cover crops: fall-winter corn, intercropping fall-winter corn with Brachiaria ruziziensis, intercropping fall-winter corn with B. brizantha cv. Marandu, intercropping fall-winter corn with Crotalaria spectabilis, B. ruziziensis, B. brizantha cv. Marandu, Pennisetum glaucum L. and set-aside area. The results of SOM granulometric fractionation showed that...
Tipo: Artigo de periódico Palavras-chave: Labile carbon; Sustainability; Carbono orgânico do solo; Soil organic carbon; Conservation tillage; Soybeans.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1065764
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Changes in attributes of soils subjected to fallow in desertification hotspot Rev. Ciênc. Agron.
Ferreira,Mirele Paula da Silva; Artur,Adriana Guirado; Queiroz,Hermano Melo; Romero,Ricardo Espíndola; Costa,Mirian Cristina Gomes.
ABSTRACT Soils in semi-arid regions have been degraded by overgrazing, which reduces the production capacity and, in certain situations, leads to desertification. An alternative to recover degraded areas is the fallow period, which works through the resilience of the soil itself, increasing the supply of organic matter and improving soil physical properties. Thus, the objective of this study was to test the hypothesis that 14-year grazing exclusion improves soil physical and chemical attributes in degraded areas under desertification. The study was conducted in Irauçuba, Ceará State, Brazil. The experimental design was completely randomized, in a 4 x 2 factorial scheme corresponding to four areas and two managements (overgrazing and fallow), with four...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil organic carbon; Soil degradation; Semi-arid region; Overgrazing.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000100022
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Impact of tree species replacement on carbon stocks in forest floor and mineral soil IPB - Escola Superior Agrária
Fonseca, Felícia; Figueiredo, Tomás de.
This study aims at evaluating the influence of replacing areas of Quercus pyrenaica, which represents native vegetation of Serra da Nogueira, NE of Portugal, by Pseudotsuga menziesii on carbon stocks in forest floor and mineral soil. Three sampling areas were selected in adjacent locations with similar soil and climate conditions. The first area, covered by Quercus pyrenaica (QP), represents the original soil. The second area is in a 40 years old stand of Pseudotsuga menziesii (PM40), and the third one, also under Pseudotsuga menziesii, is 15 years old (PM15). In each sampling area, at 10 randomly selected points, samples were collected in the forest floor (0.49 m2 quadrat) and in the soil (at 0-5, 5-10 and 10-20 cm depth). The forest floor stores 17, 13...
Tipo: Article Palavras-chave: Quercus pyrenaica; Pseudotsuga menziesii; Forest floor; Soil organic carbon.
Ano: 2010 URL: http://hdl.handle.net/10198/3600
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Impact of tree species replacement on carbon stocks in forest floor and mineral soil IPB - Escola Superior Agrária
Fonseca, Felícia; Figueiredo, Tomás de.
The increase in atmospheric carbon content, as expected considering actual trends, draws attention to the highly valuable role of forest ecosystems in the global carbon cycle. Accordingly, the carbon storage capacity by different species should be a decision support tool when introducing new forest species. This study aims at evaluating the influence of replacing areas of Quercus pyrennaica, which represents native vegetation of Serra da Nogueira, in the northeast of Portugal, by Pseudotsuga menziesii on carbon stocks in forest floor and mineral soil. Three sampling areas were selected in adjacent locations with similar soil and climate conditions. The first area, covered by Quercus pyrennaica (QP), represents the original soil. The second area is in a 40...
Tipo: ConferenceObject Palavras-chave: Quercus pyrennaica; Pseudotsuga menziesii; Forest floor; Soil organic carbon.
Ano: 2010 URL: http://hdl.handle.net/10198/4543
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Resistance of soil organic matter in "humic A horizons" of the mountainous region in the state of Rio de Janeiro. Repositório Alice
FONTANA, A.; PEREIRA, M. G.; BALIEIRO, F. de C.; CHAGAS, C. da S.; DONAGEMMA, G. K.; OLIVEIRA, L. S de.
Soils with high organic carbon content, such as those with "humic A horizon", occur in different regions of Brazil. This study aimed to determine the quantitative and qualitative characteristics of organic matter regarding the humic A horizon under different land uses in Bom Jardim, in Rio de Janeiro State, Brazil. Samples from forest, pasture, Eucalyptus plantation, coffee cultivation, olericulture, and also passion fruit soils were sampled and analyzed. In October 2011, undisturbed samples from humic A horizons, were collected for soil density analysis. In addition, disturbed samples were collected for the determination of organic carbon (C-org) content, total carbon, humic substance fractions contents and natural abundance of (13)Carbon (delta C-13)....
Tipo: Artigo de periódico Palavras-chave: Carbono orgânico; Substâncias húmicas; Composição isotópica; Carbono; Horizonte; Soil organic carbon; Humic substances.
Ano: 2020 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1121775
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No silver bullet for digital soil mapping: country-specific soil organic carbon estimates across Latin America. Repositório Alice
GUEVARA, M.; OLMEDO, G. F.; STELL, E.; YIGINI, Y.; AGUILAR DUARTE, Y.; ARELLANO HERNÁNDEZ, C.; ARÉVALO, G. E.; ARROYO-CRUZ, C. E.; BOLIVAR, A.; BUNNING, S.; BUSTAMANTE CAÑAS, N.; CRUZ-GAISTARDO, C. O.; MANUELES, A. M.; VARGAS, R.; VARGAS, R. R.; VASQUES, G. de M.; SPENCE, A.; SCHULZ, G. A.; ROSALES RIVEIRO, K. A.; ROSALES IBARRA, A.; ROOPNARINE, R.; RODRÍGUEZ-RODRÍGUEZ, J.; RIVERA, R.; MENDOZA JARA, F.; REY BRINA, J. C.; RAMOS, I. A.; PIETRO, P.; PEREIRA, G.; OSORIO HERMOSILLA, R.; FONTES, F.; OLIVERA, C.; DAVILLA, F.; DELL ACQUA, M.; ENCINA, A.; FIGUEREDO TACONA, H.; HERNÁNDEZ HERRERA, J. A.; IBELLES NAVARRO, A. R.; LOAYZA, V..
Country-specific soil organic carbon (SOC) estimates are the baseline for the Global SOC Map of the Global Soil Partnership (GSOCmap-GSP). This endeavor is key to explaining the uncertainty of global SOC estimates but requires harmonizing heterogeneous datasets and building country-specific capacities for digital soil mapping (DSM).We identified country-specific predictors for SOC and tested the performance of five predictive algorithms for mapping SOC across Latin America. The algorithms included support vector machines (SVMs), random forest (RF), kernel-weighted nearest neighbors (KK), partial least squares regression (PL), and regression kriging based on stepwise multiple linear models (RK). Country-specific training data and SOC predictors (5 x 5 km...
Tipo: Artigo de periódico Palavras-chave: Mapeamento digital do solo; Carbono orgânico do solo; Carbono; Soil organic carbon; Soil map.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1094880
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Conversion of cropland to grassland. Infoteca-e
KHALIL, M. I.; CORDOVIL, C. M. D. S.; FRANCAVIGLIA, R.; HENRY, B.; KLUMPP, K.; KONCZ, P.; LLORENTE, M.; MADARI, B. E.; MUÑOZ-ROJAS, M.; RAINER, N..
1. Description of the practice. 2. Range of applicability. 3. Impacts on soil organic carbon stocks. 4. Other benefits of the practice. 5. Potential drawbacks to the practice. 6. Recommendations before implementing the practice. 7. Potential barriers for adoption.
Tipo: Capítulo em livro técnico (INFOTECA-E) Palavras-chave: Conservação do Solo; Grassland soils; Soil organic carbon.
Ano: 2021 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1137233
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Pastoralism. Infoteca-e
KHALIL, M. I.; CORDOVIL, C. M. D. S.; FRANCAVIGLIA, R.; HENRY, B.; KLUMPP, K.; KONCZ, P.; LLORENTE, M.; MADARI, B. E.; MUÑOZ-ROJAS, M.; RAINER, N..
1. Description of the livelihood. 2. Range of applicability. 3. Impacts on soil organic carbon stocks. 4. Other benefits of the practice. 5. Potential drawbacks to the practice. 6. Recommendations before implementing the practice. 7. Potential barriers for adoption.
Tipo: Capítulo em livro técnico (INFOTECA-E) Palavras-chave: Conservação do Solo; Grassland soils; Soil organic carbon.
Ano: 2021 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1137239
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Grazing exclusion and rotational grazing. Infoteca-e
KHALIL, M. I.; CORDOVIL, C. M. D. S.; FRANCAVIGLIA, R.; HENRY, B.; KLUMPP, K.; KONCZ, P.; LLORENTE, M.; MADARI, B. E.; MUÑOZ-ROJAS, M.; RAINER, N..
1. Description of the practice. 2. Range of applicability. 3. Impacts on soil organic carbon stocks. 4. Other benefits of the practice. 5. Potential drawbacks to the practice. 6. Recommendations before implementing the practice. 7. Potential barriers for adoption.
Tipo: Capítulo em livro técnico (INFOTECA-E) Palavras-chave: Conservação do Solo; Grassland soils; Soil organic carbon.
Ano: 2021 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1137236
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Restoration of degraded grassland. Infoteca-e
KHALIL, M. I.; CORDOVIL, C. M. D. S.; FRANCAVIGLIA, R.; HENRY, B.; KLUMPP, K.; KONCZ, P.; LLORENTE, M.; MADARI, B. E.; MUÑOZ-ROJAS, M.; RAINER, N..
1. Description of the practice. 2. Range of applicability. 3. Impacts on soil organic carbon stocks. 4. Other benefits of the practice. 5. Potential drawbacks to the practice. 6. Recommendations before implementing the practice. 7. Potential barriers for adoption.
Tipo: Capítulo em livro técnico (INFOTECA-E) Palavras-chave: Conservação do Solo; Grassland soils; Soil organic carbon.
Ano: 2021 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1137232
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Improved pasture management. Infoteca-e
KHALIL, M. I.; CORDOVIL, C. M. D. S.; FRANCAVIGLIA, R.; HENRY, B.; KLUMPP, K.; KONCZ, P.; LLORENTE, M.; MADARI, B. E.; MUÑOZ-ROJAS, M.; RAINER, N..
1. Description of the practice. 2. Range of applicability. 3. Impacts on soil organic carbon stocks. 4. Other benefits of the practice. 5. Potential drawbacks to the practice. 6. Recommendations before implementing the practice. 7. Potential barriers for adoption.
Tipo: Capítulo em livro técnico (INFOTECA-E) Palavras-chave: Conservação do Solo; Grassland soils; Soil organic carbon; Pasture management.
Ano: 2021 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1137235
Registros recuperados: 68
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