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| Bernardi,Alberto Carlos de Campos; Machado,Pedro Luiz Oliveira de Almeida; Madari,Beata Emoke; Tavares,Sílvio Roberto de Lucena; Campos,David Vilas Boas de; Crisóstomo,Lindbergue de Araújo. |
| Soil organic matter accumulation provides benefits to soil productivity and reduces atmospheric carbon concentration. However, little is known about the accumulation of C and N by sandy soils under perennial irrigated crops in semiarid regions. The objective of this study was to evaluate the effect of irrigated fruit orchard cultivation on the stocks of soil organic carbon (SOC) and total nitrogen (N) of an Arenosol/Quartzpsament from Paraipaba-CE, Semiarid Brazil. Soil samples were taken from irrigated orchards of banana (Musa ssp.), cashew (Anacardium ocidentale), guava (Psidium guajava), bullock's heart (Annona reticulata), mango (Mangifera indica), and sapote (Manilkara zapota) in the wetted-bulb and non-irrigated area between the plant rows.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Caatinga forest; Soil organic matter; Soil stratification index. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200010 |
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| Cunha,Tony Jarbas Ferreira; Madari,Beata Emoke; Benites,Vinicius de Melo; Canellas,Luciano Pasqualoto; Novotny,Etelvino Henrique; Moutta,Rondinele de Oliveira; Trompowsky,Patrick Marques; Santos,Gabriel de Araújo. |
| Os solos da Amazônia que possuem horizonte A antrópico (Au) apresentam elevada fertilidade natural geralmente atribuída ao teor elevado de matéria orgânica e à sua elevada reatividade. Neste estudo foram quantificadas as substâncias húmicas e caracterizados os ácidos húmicos (AH) extraídos da camada 0-20 cm de solos com horizonte Au do estado do Amazonas (Terra Preta de Índio) sob floresta e cultivo agrícola. Também foram investigadas amostras de solos adjacentes sem o horizonte antrópico. A caracterização dos AH foi realizada através de análise termogravimétrica, análise da composição elementar e quantificação dos grupos funcionais (total, carboxílica e fenólica). Os horizontes A de solos antropogênicos apresentaram maior teor de carbono total, comparados... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solos antropogênicos; Amazônia; Termogravimétria; Composição elementar; Acidez. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672007000100010 |
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| Cunha,Tony Jarbas Ferreira; Madari,Beata Emoke; Canellas,Luciano Pasqualoto; Ribeiro,Lucedino Paixão; Benites,Vinicius de Melo; Santos,Gabriel de Araújo. |
| Fertility properties, total C (Ctot), and chemical soil organic matter fractions (fulvic acid fraction - FA, humic acid fraction - HA, humin fraction - H) of anthropogenic dark earths (Terra Preta de Índio) of the Amazon basin were compared with those of Ferralsols with no anthropogenic A horizon. Terra Preta soils had a higher fertility (pH: 5.1-5.4; Sum of bases, SB: 8.93-10.33 cmol c kg-1 , CEC: 17.2-17.5 cmol c kg-1 , V: 51-59 %, P: 116-291 mg kg-1) and Ctot (44.6-44.7 g kg-1) than adjacent Ferralsols (pH: 4.4; SB: 2.04 cmol c kg-1, CEC: 9.5 cmol c kg-1, V: 21 %, P 5 mg kg-1, C: 37.9 g kg-1). The C distribution among humic substance fractions (FA, HA, H) in Terra Preta soils was also different, as shown by the ratios HA:FA and EA/H (EA=HA+FA) (2.1-3.0... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Humic substances; Humin fraction; Cation exchange capacity; Total soil carbon. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000100009 |
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| Pereira,Rogério Gomes; Heinemann,Alexandre Bryan; Madari,Beata Emoke; Carvalho,Marcia Thais de Melo; Kliemann,Huberto José; Santos,Aurélio Pereira dos. |
| The objective of this work was to evaluate the effect of eucalyptus biochar on the transpiration rate of upland rice 'BRSMG Curinga' as an alternative means to decrease the effect of water stress on plant growth and development. Two-pot experiments were carried out using a completely randomized block design, in a split-plot arrangement, with six replicates. Main plots were water stress (WS) and no-water stress (NWS), and the subplots were biochar doses at 0, 6, 12 and 24% in growing medium (sand). Total transpirable soil water (TTSW), the p factor - defined as the average fraction of TTSW which can be depleted from the root zone before water stress limits growth -, and the normalized transpiration rate (NTR) were determined. Biochar addition increased TTSW... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eucalyptus; Oryza sativa; Abiotic stress; Water deficit. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000500012 |
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