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Registro Completo |
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Biblioteca(s): |
Embrapa Meio Ambiente. |
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Data corrente: |
03/05/1994 |
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Data da última atualização: |
03/05/1994 |
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Autoria: |
BERGAMASCO, S. M. P. P.; CARMO, M. S. do. |
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Afiliação: |
UNICAMP-FEAGRI, Campinas, SP; IEA, Sao Paulo, SP. |
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Título: |
Reforma agraria da certo?: a relatividade do sucesso/insucesso dos assentamento de trabalhadores rurais. |
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Ano de publicação: |
1989 |
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Fonte/Imprenta: |
[S.l.: s.n., 1989?]. |
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Páginas: |
22p. |
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Idioma: |
Português |
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Palavras-Chave: |
Agrovila; Assentamento Bela Vista Chibarro; Assentamento Cinturao Verde; Assentamento Gleba XV; Assentamento Lagoa Sao Paulo; Assentamento Querencia do Norte; Assentamento Rosana; Assentamento rural; Assentamento Selviria; Assentamento Sumare I; Assentamento Sumare II; Atividade produtiva; Benfeitoria; Uso. |
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Thesagro: |
Associativismo; Comercialização; Cooperativismo; Crédito; Família; Fertilidade; Mão-de-Obra; Produção; Reforma Agrária; Solo; Tecnologia; Trabalhador Rural; Trabalho. |
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Thesaurus Nal: |
area. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01289nam a2200457 a 4500
001 1011725
005 1994-05-03
008 1989 bl uuuu u0uu1 u #d
100 1 $aBERGAMASCO, S. M. P. P.
245 $aReforma agraria da certo?$ba relatividade do sucesso/insucesso dos assentamento de trabalhadores rurais.
260 $a[S.l.: s.n., 1989?].$c1989
300 $a22p.
650 $aarea
650 $aAssociativismo
650 $aComercialização
650 $aCooperativismo
650 $aCrédito
650 $aFamília
650 $aFertilidade
650 $aMão-de-Obra
650 $aProdução
650 $aReforma Agrária
650 $aSolo
650 $aTecnologia
650 $aTrabalhador Rural
650 $aTrabalho
653 $aAgrovila
653 $aAssentamento Bela Vista Chibarro
653 $aAssentamento Cinturao Verde
653 $aAssentamento Gleba XV
653 $aAssentamento Lagoa Sao Paulo
653 $aAssentamento Querencia do Norte
653 $aAssentamento Rosana
653 $aAssentamento rural
653 $aAssentamento Selviria
653 $aAssentamento Sumare I
653 $aAssentamento Sumare II
653 $aAtividade produtiva
653 $aBenfeitoria
653 $aUso
700 1 $aCARMO, M. S. do
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Registro original: |
Embrapa Meio Ambiente (CNPMA) |
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Registro Completo
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Biblioteca(s): |
Embrapa Meio-Norte. |
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Data corrente: |
15/03/2008 |
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Data da última atualização: |
06/10/2023 |
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Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
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Autoria: |
LEITE, L. F. C.; DORAISWAMY, P. C. |
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Afiliação: |
LUIZ FERNANDO CARVALHO LEITE, CPAMN; P. C. DORAISWAMY, USDA/ARS. |
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Título: |
CQESTR: a simple model to estimate carbon sequestration in tropical soils. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 31., 2007, Gramado. Conquistas e desafios da ciência do solo brasileira: anais. Gramado: SBCS, 2007. |
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Páginas: |
5 p. |
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Idioma: |
Português |
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Notas: |
1 CD-ROM. |
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Conteúdo: |
CQESTR simulates the effect of management practices on soil organic carbon (SOC) stocks. The beta version of the model had been calibrated and validated for temperate regions. Our objective was to evaluate the CQESTR model performance for simulating carbon dynamics as affected by tillage practices in two tropical soils (Ultisol and Oxisol) in southeastern and northeastern Brazil. In the southeast (20.75 S 42.81 W), tillage systems consisted of no tillage (NT); reduced tillage (RT) (one disc plough and one harrow leveling [RT1] or one heavy disc harrow and one harrow leveling [RT2]); and conventional tillage (CT) (two heavy disc harrows followed by one disc plough and two harrow levelings). In the northeast (7.55 S 45.23 W), tillage systems consisted of NT, RT (one chisel plow and one harrow leveling), and CT (one disk plow, two heavy disk harrowings, and two harrow levelings). CQESTR underestimated SOC at both sites, especially under NTsystems, indicating that adjustments (e.g., the inclusion of clay mineralogy factor) are necessary for more accurate simulation of SOC in the tropics. In spite of this, measured and simulated values of SOC in the 0?20 cm depth were well correlated (southeast, R2 =0.94, p<0.01; northeast, R2=0.88, p<0.05). The model estimated carbon emissions varying from 0.36 (NT) to 1.05 Mg ha-1 year-1 (CT) in the southeast and from 0.30 (NT) to 0.82 (CT) Mg ha-1 year-1 in the northeast. CQESTR showed acceptable performance to predict SOC dynamics in two tropical soils of Brazil. MenosCQESTR simulates the effect of management practices on soil organic carbon (SOC) stocks. The beta version of the model had been calibrated and validated for temperate regions. Our objective was to evaluate the CQESTR model performance for simulating carbon dynamics as affected by tillage practices in two tropical soils (Ultisol and Oxisol) in southeastern and northeastern Brazil. In the southeast (20.75 S 42.81 W), tillage systems consisted of no tillage (NT); reduced tillage (RT) (one disc plough and one harrow leveling [RT1] or one heavy disc harrow and one harrow leveling [RT2]); and conventional tillage (CT) (two heavy disc harrows followed by one disc plough and two harrow levelings). In the northeast (7.55 S 45.23 W), tillage systems consisted of NT, RT (one chisel plow and one harrow leveling), and CT (one disk plow, two heavy disk harrowings, and two harrow levelings). CQESTR underestimated SOC at both sites, especially under NTsystems, indicating that adjustments (e.g., the inclusion of clay mineralogy factor) are necessary for more accurate simulation of SOC in the tropics. In spite of this, measured and simulated values of SOC in the 0?20 cm depth were well correlated (southeast, R2 =0.94, p<0.01; northeast, R2=0.88, p<0.05). The model estimated carbon emissions varying from 0.36 (NT) to 1.05 Mg ha-1 year-1 (CT) in the southeast and from 0.30 (NT) to 0.82 (CT) Mg ha-1 year-1 in the northeast. CQESTR showed acceptable performance to predict SOC dynamics in two trop... Mostrar Tudo |
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Palavras-Chave: |
Matéria orgânica do solo. |
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Thesagro: |
Solo Tropical. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/69624/1/s-125-08.pdf
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Marc: |
LEADER 02126nam a2200169 a 4500
001 1069624
005 2023-10-06
008 2007 bl uuuu u00u1 u #d
100 1 $aLEITE, L. F. C.
245 $aCQESTR$ba simple model to estimate carbon sequestration in tropical soils.$h[electronic resource]
260 $aIn: CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 31., 2007, Gramado. Conquistas e desafios da ciência do solo brasileira: anais. Gramado: SBCS$c2007
300 $a5 p.
500 $a1 CD-ROM.
520 $aCQESTR simulates the effect of management practices on soil organic carbon (SOC) stocks. The beta version of the model had been calibrated and validated for temperate regions. Our objective was to evaluate the CQESTR model performance for simulating carbon dynamics as affected by tillage practices in two tropical soils (Ultisol and Oxisol) in southeastern and northeastern Brazil. In the southeast (20.75 S 42.81 W), tillage systems consisted of no tillage (NT); reduced tillage (RT) (one disc plough and one harrow leveling [RT1] or one heavy disc harrow and one harrow leveling [RT2]); and conventional tillage (CT) (two heavy disc harrows followed by one disc plough and two harrow levelings). In the northeast (7.55 S 45.23 W), tillage systems consisted of NT, RT (one chisel plow and one harrow leveling), and CT (one disk plow, two heavy disk harrowings, and two harrow levelings). CQESTR underestimated SOC at both sites, especially under NTsystems, indicating that adjustments (e.g., the inclusion of clay mineralogy factor) are necessary for more accurate simulation of SOC in the tropics. In spite of this, measured and simulated values of SOC in the 0?20 cm depth were well correlated (southeast, R2 =0.94, p<0.01; northeast, R2=0.88, p<0.05). The model estimated carbon emissions varying from 0.36 (NT) to 1.05 Mg ha-1 year-1 (CT) in the southeast and from 0.30 (NT) to 0.82 (CT) Mg ha-1 year-1 in the northeast. CQESTR showed acceptable performance to predict SOC dynamics in two tropical soils of Brazil.
650 $aSolo Tropical
653 $aMatéria orgânica do solo
700 1 $aDORAISWAMY, P. C.
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Embrapa Meio-Norte (CPAMN) |
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