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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
28/03/2002 |
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Data da última atualização: |
28/03/2002 |
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Autoria: |
LILIENFEIN, J.; WILCKER, W.; LIMA, S. do; VILELA, L.; THOMAS, R.; ZECH, W. |
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Título: |
Nutrient concentration in soil solution of some Brazilian Oxisols under conventional and no-tillage systems in the early part of the rainy season. |
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Ano de publicação: |
2000 |
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Fonte/Imprenta: |
Australian Journal of Soil Research, v. 38, p. 851-866, 2000. |
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Idioma: |
Inglês |
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Conteúdo: |
In the south america savanna, no-tilage (NT) is implemented to improve the sustainability of cropping systems. At the beginning of the rainy season, however, more plant nutrients may be leached under NT than under coventional tillage (CT) because of more pronounced organic matter mineralisation and increased pore continuity. To test this hypothesis, we analysed tje chemical composition of the soil solutinon under conventional (CT) and no-tilage (NT) soybean (Glicyne max (L.) Merr.) fields in the brazilian savanna (cerrados). We collected the soil solution at 0.15, 0.3, 0.8, 1.2, and 2 m depth and the precipitation in 1- to 3-day intervals from 28 october to 23 december 1998 on plots under CT and NT, replicated 3 times. We determined pH, electrical conductivity (EC), Ca, K, Mg, Na, NO, NH, Cl, and total organic carbon (TOC) concentrations in soil solution and precipitation. Soil solution Ph under NT was 0.3-0.8 units lower than under CT and was inversely related to TOC concentrations ( average under NT 1.02, CT 0.70 mmol C/L) at all depths. Av erage Cl . Ca and Mg concentrations at 0.15-0.3 m depth were significantly higher under CT (1.09. 1.1. and 0.25 mmol L) than under NT (0.50. 0.83. and 0.17 mmol/L), respectively. No difference was observed in average NO (0.30mmol/L),Cl (0.18 mmol/L), Ca (0.19 mmol/L), Mg (0.05 mmol/L), and Na (0.04 mmol/L), concentrations under CT were significantly lawer than under NT (NO, 0.38; Cl 0.40; Ca 0.23; Mg 0.09; Na 0.06 mmol/L). In the monitored period the Cl which had accumulated durind the dry season and which was applied with KCl fertiliser on 29 October reached a depth of 0.3 m under CT and of 1.2 m under NT. The results suggest higher mineralisation rates and faster leaching in the NT than in the CT systems being the combined result of different polwing practices and different cropping sequences. MenosIn the south america savanna, no-tilage (NT) is implemented to improve the sustainability of cropping systems. At the beginning of the rainy season, however, more plant nutrients may be leached under NT than under coventional tillage (CT) because of more pronounced organic matter mineralisation and increased pore continuity. To test this hypothesis, we analysed tje chemical composition of the soil solutinon under conventional (CT) and no-tilage (NT) soybean (Glicyne max (L.) Merr.) fields in the brazilian savanna (cerrados). We collected the soil solution at 0.15, 0.3, 0.8, 1.2, and 2 m depth and the precipitation in 1- to 3-day intervals from 28 october to 23 december 1998 on plots under CT and NT, replicated 3 times. We determined pH, electrical conductivity (EC), Ca, K, Mg, Na, NO, NH, Cl, and total organic carbon (TOC) concentrations in soil solution and precipitation. Soil solution Ph under NT was 0.3-0.8 units lower than under CT and was inversely related to TOC concentrations ( average under NT 1.02, CT 0.70 mmol C/L) at all depths. Av erage Cl . Ca and Mg concentrations at 0.15-0.3 m depth were significantly higher under CT (1.09. 1.1. and 0.25 mmol L) than under NT (0.50. 0.83. and 0.17 mmol/L), respectively. No difference was observed in average NO (0.30mmol/L),Cl (0.18 mmol/L), Ca (0.19 mmol/L), Mg (0.05 mmol/L), and Na (0.04 mmol/L), concentrations under CT were significantly lawer than under NT (NO, 0.38; Cl 0.40; Ca 0.23; Mg 0.09; Na 0.06 mmol/L). In the monito... Mostrar Tudo |
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Palavras-Chave: |
Estacao chuvosa; Nutrientes. |
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Thesagro: |
Cerrado; Glycine Max; Lixiviação; Plantio Direto; Soja. |
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Thesaurus Nal: |
leaching; nutrients; soybeans. |
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Categoria do assunto: |
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Marc: |
LEADER 02700naa a2200301 a 4500
001 1564578
005 2002-03-28
008 2000 bl --- 0-- u #d
100 1 $aLILIENFEIN, J.
245 $aNutrient concentration in soil solution of some Brazilian Oxisols under conventional and no-tillage systems in the early part of the rainy season.
260 $c2000
520 $aIn the south america savanna, no-tilage (NT) is implemented to improve the sustainability of cropping systems. At the beginning of the rainy season, however, more plant nutrients may be leached under NT than under coventional tillage (CT) because of more pronounced organic matter mineralisation and increased pore continuity. To test this hypothesis, we analysed tje chemical composition of the soil solutinon under conventional (CT) and no-tilage (NT) soybean (Glicyne max (L.) Merr.) fields in the brazilian savanna (cerrados). We collected the soil solution at 0.15, 0.3, 0.8, 1.2, and 2 m depth and the precipitation in 1- to 3-day intervals from 28 october to 23 december 1998 on plots under CT and NT, replicated 3 times. We determined pH, electrical conductivity (EC), Ca, K, Mg, Na, NO, NH, Cl, and total organic carbon (TOC) concentrations in soil solution and precipitation. Soil solution Ph under NT was 0.3-0.8 units lower than under CT and was inversely related to TOC concentrations ( average under NT 1.02, CT 0.70 mmol C/L) at all depths. Av erage Cl . Ca and Mg concentrations at 0.15-0.3 m depth were significantly higher under CT (1.09. 1.1. and 0.25 mmol L) than under NT (0.50. 0.83. and 0.17 mmol/L), respectively. No difference was observed in average NO (0.30mmol/L),Cl (0.18 mmol/L), Ca (0.19 mmol/L), Mg (0.05 mmol/L), and Na (0.04 mmol/L), concentrations under CT were significantly lawer than under NT (NO, 0.38; Cl 0.40; Ca 0.23; Mg 0.09; Na 0.06 mmol/L). In the monitored period the Cl which had accumulated durind the dry season and which was applied with KCl fertiliser on 29 October reached a depth of 0.3 m under CT and of 1.2 m under NT. The results suggest higher mineralisation rates and faster leaching in the NT than in the CT systems being the combined result of different polwing practices and different cropping sequences.
650 $aleaching
650 $anutrients
650 $asoybeans
650 $aCerrado
650 $aGlycine Max
650 $aLixiviação
650 $aPlantio Direto
650 $aSoja
653 $aEstacao chuvosa
653 $aNutrientes
700 1 $aWILCKER, W.
700 1 $aLIMA, S. do
700 1 $aVILELA, L.
700 1 $aTHOMAS, R.
700 1 $aZECH, W.
773 $tAustralian Journal of Soil Research$gv. 38, p. 851-866, 2000.
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Embrapa Cerrados (CPAC) |
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