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| 16. |  | MENEZES, F. A. B. de; CATUNDA, A. G.; MACHADO, F. H. F.; MACEDO, F. A. R. Comportamento de ovinos deslanados da raça Morada Nova, var. Vermelha, em pastagem nativa melhorada com introdução de capim buffel. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 16., 1979, Curitiba. Anais... Curitiba: Sociedade Brasileira de Zootecnia, 1979. v. 1. p. 45.| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| 19. | | FERNANDES, A. A. O.; MACHADO, F. H. F.; MENEZES, F. A. B. de; CATUNDA, A. G. Desempenho de ovinos deslanados da raça Morada Nova, var. Vermelha em pastagem nativa melhorada. In: CONGRESSO BRASILEIRO DE ZOOTECNIA, 1.; REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 17., 1980, Fortaleza. Anais... Fortaleza: Sociedade Brasileira de Zootecnia, 1980. p. 81.| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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Registro Completo
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
15/05/2017 |
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Data da última atualização: |
11/11/2021 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
VOLF, M.; BENITES, V. de M.; ROSOLEM, A. C.; CRUSCIOL, A. C.; MORAES, F. M.; MENEZES, F. J.; SILVA, C. A. |
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Afiliação: |
MARCELO RAPHAEL VOLF, UNESP; VINICIUS DE MELO BENITES, CNPS; CIRO ANTONIO ROSOLEM, UNESP; CARLOS ALEXANDRE COSTA CRUSCIOL, UNESP; MILTON F. MORAES, UFMT; JUNE FARIA SCHERRER MENEZES, UNIRV; ANA C. SILVA, DALCIN LABORATORY OF SOIL AND PLANT. |
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Título: |
Silt as K source for crops in tropical soils. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
In: FRONTIERS OF POTASSIUM SCIENCE CONFERENCE, 2017, Rome. Proceedings... Peachtree Corners: International Plant Nutrition Institute, 2017. Ref. P185-P193. |
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Idioma: |
Inglês |
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Conteúdo: |
The original soil exchangeable potassium (K) concentrations are at or above critical levels in many Brazilian Cerrado (savanna) soils. Hence, many cropped areas have been fertilized with low K rates, below crop requirements, but yields have not decreased as expected. In these areas, topsoil exchangeable K analyses have shown no decrease, or even some increase. The aim of this study was to evaluate exchangeable and non-exchangeable K forms in soils under different uses and managements in the Vale do Araguaia region of Mato Grosso state, Brazil. Soil samples were taken from 91 sites at depths of 0-20 cm and 20-40 cm, in areas under grain crops, pasture and native vegetation (Cerrado or forest). Silt content ranged from 12 to 175 g kg-1 and clay from 90 to 595 g kg-1, and the predominant clays were kaolinite, hematite, goethite and gibbsite. Under pasture, the soils had high levels of exchangeable K in the 0-20 cm layer and high levels of non-exchangeable K from 20 to 40 cm. This can be a result of the absorption of non-exchangeable K by grasses, the main cultivated species, by recycling K to the exchangeable fraction in the topsoil. There was a positive relationship between silt and non-exchangeable K contents. Ratios of exchangeable to non-exchangeable K were over 3 in soils with silt above 70 g kg-1, in which non-exchangeable K was over 100 mg dm-3. Cover crops growing in soils rich in silt take up non-exchangeable K and exchangeable K from deeper layers, which is recycled to the soil as exchangeable K upon plant residue mineralization, which may have been responsible for the maintenance or increase in exchangeable K levels in the 0-20 cm layer in areas where low K rates have been used for grain production. MenosThe original soil exchangeable potassium (K) concentrations are at or above critical levels in many Brazilian Cerrado (savanna) soils. Hence, many cropped areas have been fertilized with low K rates, below crop requirements, but yields have not decreased as expected. In these areas, topsoil exchangeable K analyses have shown no decrease, or even some increase. The aim of this study was to evaluate exchangeable and non-exchangeable K forms in soils under different uses and managements in the Vale do Araguaia region of Mato Grosso state, Brazil. Soil samples were taken from 91 sites at depths of 0-20 cm and 20-40 cm, in areas under grain crops, pasture and native vegetation (Cerrado or forest). Silt content ranged from 12 to 175 g kg-1 and clay from 90 to 595 g kg-1, and the predominant clays were kaolinite, hematite, goethite and gibbsite. Under pasture, the soils had high levels of exchangeable K in the 0-20 cm layer and high levels of non-exchangeable K from 20 to 40 cm. This can be a result of the absorption of non-exchangeable K by grasses, the main cultivated species, by recycling K to the exchangeable fraction in the topsoil. There was a positive relationship between silt and non-exchangeable K contents. Ratios of exchangeable to non-exchangeable K were over 3 in soils with silt above 70 g kg-1, in which non-exchangeable K was over 100 mg dm-3. Cover crops growing in soils rich in silt take up non-exchangeable K and exchangeable K from deeper layers, which is recycled t... Mostrar Tudo |
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Palavras-Chave: |
Vale do Araguaia. |
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Thesagro: |
Cerrado; Solo. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/159821/1/2017-004.pdf
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Marc: |
LEADER 02428nam a2200217 a 4500
001 2069571
005 2021-11-11
008 2017 bl uuuu u00u1 u #d
100 1 $aVOLF, M.
245 $aSilt as K source for crops in tropical soils.$h[electronic resource]
260 $aIn: FRONTIERS OF POTASSIUM SCIENCE CONFERENCE, 2017, Rome. Proceedings... Peachtree Corners: International Plant Nutrition Institute, 2017. Ref. P185-P193.$c2017
520 $aThe original soil exchangeable potassium (K) concentrations are at or above critical levels in many Brazilian Cerrado (savanna) soils. Hence, many cropped areas have been fertilized with low K rates, below crop requirements, but yields have not decreased as expected. In these areas, topsoil exchangeable K analyses have shown no decrease, or even some increase. The aim of this study was to evaluate exchangeable and non-exchangeable K forms in soils under different uses and managements in the Vale do Araguaia region of Mato Grosso state, Brazil. Soil samples were taken from 91 sites at depths of 0-20 cm and 20-40 cm, in areas under grain crops, pasture and native vegetation (Cerrado or forest). Silt content ranged from 12 to 175 g kg-1 and clay from 90 to 595 g kg-1, and the predominant clays were kaolinite, hematite, goethite and gibbsite. Under pasture, the soils had high levels of exchangeable K in the 0-20 cm layer and high levels of non-exchangeable K from 20 to 40 cm. This can be a result of the absorption of non-exchangeable K by grasses, the main cultivated species, by recycling K to the exchangeable fraction in the topsoil. There was a positive relationship between silt and non-exchangeable K contents. Ratios of exchangeable to non-exchangeable K were over 3 in soils with silt above 70 g kg-1, in which non-exchangeable K was over 100 mg dm-3. Cover crops growing in soils rich in silt take up non-exchangeable K and exchangeable K from deeper layers, which is recycled to the soil as exchangeable K upon plant residue mineralization, which may have been responsible for the maintenance or increase in exchangeable K levels in the 0-20 cm layer in areas where low K rates have been used for grain production.
650 $aCerrado
650 $aSolo
653 $aVale do Araguaia
700 1 $aBENITES, V. de M.
700 1 $aROSOLEM, A. C.
700 1 $aCRUSCIOL, A. C.
700 1 $aMORAES, F. M.
700 1 $aMENEZES, F. J.
700 1 $aSILVA, C. A.
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