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Registro Completo |
Biblioteca(s): |
Embrapa Agroindústria Tropical; Embrapa Solos; Embrapa Trigo. |
Data corrente: |
18/12/1995 |
Data da última atualização: |
22/11/2002 |
Autoria: |
FREITAS, P. L. de. |
Afiliação: |
EMBRAPA-SNLCS, Rio de Janeiro, RJ. |
Título: |
Effects of soil structure on root growth and function. |
Ano de publicação: |
1988 |
Fonte/Imprenta: |
[S.l.]: Cornell University, 1988. |
Páginas: |
213 p. |
Idioma: |
Inglês |
Notas: |
Tese Doutorado |
Conteúdo: |
Soil physical properties affecties effect plant growth, by providing the conditions for root growth and function. The effect of soil structure, recognized as one the most important physical properties of soil, on plant growth is reviewed. In order to better understand how soil structure and other related properties affect root growth and function, soil physical and plant physiological aspects are discussed. Some questions are raised about the validity of explaining differences in crop yield by the evaluation of soil productivity and tillage systems using macroproperties, such as soil density and mechanical impedance. It is suggested that the best characterization of a soil is based on microproperties, such as pore-size distribution and size, density, strength,and stability of aggregates. To validate this hypothesis a method was developed to simulate soil aggregates of different size and density. A silty soil was prepared and compressed to densities of 1.4, 1.6, and 1.8 Mg. m3, shaped to different cubical sizes (25 and 50 mm sides), and placed face-to-face in soil columns 25 cm high and 20 cm in diameter. A main check treatment was included to simulate field conditions. In these artificial, homogeneous soil columns, corn (Zea mays L.) plants were grown for 33 days. Plant behavior was determined by characterization of shoot and root growth. Shoot dry weight, leaf area, and shoot apex height were measured at the end of the growth period. From the soil columns, final density of soil and aggregates were determined. ... MenosSoil physical properties affecties effect plant growth, by providing the conditions for root growth and function. The effect of soil structure, recognized as one the most important physical properties of soil, on plant growth is reviewed. In order to better understand how soil structure and other related properties affect root growth and function, soil physical and plant physiological aspects are discussed. Some questions are raised about the validity of explaining differences in crop yield by the evaluation of soil productivity and tillage systems using macroproperties, such as soil density and mechanical impedance. It is suggested that the best characterization of a soil is based on microproperties, such as pore-size distribution and size, density, strength,and stability of aggregates. To validate this hypothesis a method was developed to simulate soil aggregates of different size and density. A silty soil was prepared and compressed to densities of 1.4, 1.6, and 1.8 Mg. m3, shaped to different cubical sizes (25 and 50 mm sides), and placed face-to-face in soil columns 25 cm high and 20 cm in diameter. A main check treatment was included to simulate field conditions. In these artificial, homogeneous soil columns, corn (Zea mays L.) plants were grown for 33 days. Plant behavior was determined by characterization of shoot and root growth. Shoot dry weight, leaf area, and shoot apex height were measured at the end of the growth period. From the soil columns, final density of ... Mostrar Tudo |
Palavras-Chave: |
Estrutura; Sistema radicular - crescimento; Sistema radicular - funcionamento; Solo - estrutura. |
Thesagro: |
Manejo; Raiz; Solo. |
Categoria do assunto: |
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Marc: |
LEADER 02108nam a2200217 a 4500 001 1327301 005 2002-11-22 008 1988 bl uuuu m 00u1 u #d 100 1 $aFREITAS, P. L. de 245 $aEffects of soil structure on root growth and function. 260 $a[S.l.]: Cornell University$c1988 300 $a213 p. 500 $aTese Doutorado 520 $aSoil physical properties affecties effect plant growth, by providing the conditions for root growth and function. The effect of soil structure, recognized as one the most important physical properties of soil, on plant growth is reviewed. In order to better understand how soil structure and other related properties affect root growth and function, soil physical and plant physiological aspects are discussed. Some questions are raised about the validity of explaining differences in crop yield by the evaluation of soil productivity and tillage systems using macroproperties, such as soil density and mechanical impedance. It is suggested that the best characterization of a soil is based on microproperties, such as pore-size distribution and size, density, strength,and stability of aggregates. To validate this hypothesis a method was developed to simulate soil aggregates of different size and density. A silty soil was prepared and compressed to densities of 1.4, 1.6, and 1.8 Mg. m3, shaped to different cubical sizes (25 and 50 mm sides), and placed face-to-face in soil columns 25 cm high and 20 cm in diameter. A main check treatment was included to simulate field conditions. In these artificial, homogeneous soil columns, corn (Zea mays L.) plants were grown for 33 days. Plant behavior was determined by characterization of shoot and root growth. Shoot dry weight, leaf area, and shoot apex height were measured at the end of the growth period. From the soil columns, final density of soil and aggregates were determined. ... 650 $aManejo 650 $aRaiz 650 $aSolo 653 $aEstrutura 653 $aSistema radicular - crescimento 653 $aSistema radicular - funcionamento 653 $aSolo - estrutura
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Embrapa Solos (CNPS) |
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Registros recuperados : 167 | |
2. | | FREITAS, P. L. de. Recuperação e conservação do solo. In: WEBINAR DESAFIOS DO SOILSPLAY, 7., 2021, Rio de Janeiro. Recuperação e conservação do solo. Rio de Janeiro: Embrapa Solos, 2021. Evento online. Transmitido em: 15 jun. 2021.Tipo: Artigo em Anais de Congresso |
Biblioteca(s): Embrapa Solos. |
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Registros recuperados : 167 | |
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