Impaired internal drainage and Aphanomyces euteiches root rot of pea caused by soil compaction in a fine-textured soil

Allmaras, R. R.; Fritz, Vincent A.; Pfleger, F. L.; Copeland, S. M.

doi:10.1016/s0167-1987(02)00117-4

Cited by 35 publications

(15 citation statements)

References 30 publications

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“…A maior ocorrência de valores de Ds em que θ pa < θ cc sugere que, em PDS, há maior risco de as culturas sofrerem estresses por aeração em condições de elevada umidade do solo. Nesses solos, condições anóxicas têm sido indicadas como provável causa de doenças na fase de crescimento inicial das culturas, a exemplo dos resultados reportados por Allmaras et al (2002).…”

Section: Quadro 2 Equações Da Curva De Resistência Do Solo à Penetraunclassified

Variação temporal do intervalo hídrico ótimo de um latossolo vermelho distroférrico sob sistemas de plantio direto

Tormena

Araújo²,

Fidalski

et al. 2007

Rev. Bras. Ciênc. Solo

103

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Section: Quadro 2 Equações Da Curva De Resistência Do Solo à Penetraunclassified

Variação temporal do intervalo hídrico ótimo de um latossolo vermelho distroférrico sob sistemas de plantio direto

Tormena

Araújo²,

Fidalski

et al. 2007

Rev. Bras. Ciênc. Solo

103

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“…Researchers have highlighted the importance of the soil physical environment for plant growth (Silva & Kay, 1996) and for the chemical (Drury et al, 2003) and biological (Allmaras et al, 2002) soil conditions. Different soil physical properties have been used to assess the soil physical quality including the least limiting water range (Silva & Kay, 1996;Silva & Kay, 2004 Dexter (2004a;2004b;2004c) recently proposed the S parameter to evaluate the soil physical and structural quality.…”

Section: Introductionmentioning

confidence: 99%

Quantification of the soil physical quality of a tropical oxisol using the S index

Tormena

Silva²,

Imhoff³

et al. 2008

Sci. agric. (Piracicaba, Braz.)

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Soil physical quality is fundamental for the sustainability of agro ecosystems. Soil physical quality assessment must be developed using parameters that describe physical behavior. S, a new soil physical parameter has recently been introduced for assessing the soil physical quality. A good soil physical quality has been associated with values of S > 0.035 in soils from temperate climates. However, S has not been evaluated in tropical soils yet. Therefore we tested the hypothesis that S is a reliable soil physical quality indicator of a Typic Hapludox cropped with maize under notillage (NT) and conventional tillage (CT). Undisturbed samples were collected from each tillage system in the row and interrow positions. Soil bulk density was determined in the samples and the S parameter was calculated using a pedotransfer function from the same samples. The parameter S was able to differentiate tillage and position with S NT < S CT independent of the row and interrow sampling positions. Higher S values were verified in row position than in the interrow in both tillage systems. With the use of a pedotransfer function it was also possible to establish a negative relationship between S and soil compaction. The results confirmed our hypothesis and suggest that further studies should be carried out to evaluate S in other tropical soils and management systems. Key words: bulk density, tropical soils, no-tillage, soil water retention, soil structure QUANTIFICAÇÃO DA QUALIDADE FÍSICA DE UM LATOSSOLO UTILIZANDO O ÍNDICE SRESUMO: A qualidade física do solo é fundamental para a sustentabilidade dos sistemas agropecuários e deve ser feita por meio de parâmetros que descrevem o comportamento físico do mesmo. O índice S é um desses novos parâmetros, proposto para quantificar a qualidade física do solo. Valores de S > 0,035 têm sido associados com uma boa qualidade física relacionada à produção agrícola nos solos desenvolvidos em clima temperado. Contudo, S não tem sido avaliado em solos tropicais. Consequentemente, a hipótese deste trabalho é que S pode ser utilizado como indicador da qualidade física de um Latossolo Vermelho distroférrico cultivado com milho em sistemas de plantio direto (PD) e de preparo convencional do solo (PC). Amostras indeformadas de solo foram obtidas em PD e PC nas posições linha e entrelinha da cultura de milho. A densidade do solo foi medida e o índice S foi calculado usando uma função de pedotransferência obtida no mesmo, em condições experimentais. O índice S diferenciou os sistemas de preparo e posições de amostragem, sendo S PD < S PC independente das posições de amostragem linha e entrelinha. Na posição linha verificou-se maiores valores de S tanto em PD como em PC. O valor de S diminuiu com o aumento da densidade do solo, indicando a redução da sua qualidade física, associada à compactação do mesmo. Os resultados confirmam a hipótese estabelecida e sugerem que mais estudos devem ser conduzidos para quantificar o índice S em diferentes solos e sistemas de manejo sob condições tropicais. Pal...

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“…Soil drainage is also directly related to plant growth. Plants grown on poorly drained soil could suffer from reduced growth, leaf dieback due to root suffocation, and root disease (Allmaras et al 2003). Plants experiencing root decline from excess water are also more susceptible to attack by secondary diseases and insects (Colombo et al 1998).…”

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confidence: 99%

Model prediction of soil drainage classes based on digital elevation model parameters and soil attributes from coarse resolution soil maps

Zhao¹,

Chow²,

Yang³

et al. 2008

Can. J. Soil. Sci.

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Model prediction of soil drainage classes based on digital elevation model parameters and soil attributes from coarse resolution soil maps. Can. J. Soil Sci. 88: 787Á799. High-resolution soil drainage maps are important for crop production planning, forest management, and environmental assessment. Existing soil classification maps tend to only have information about the dominant soil drainage conditions and they are inadequate for precision forestry and agriculture planning purposes. The objective of this research was to develop an artificial neural network (ANN) model for producing soil drainage classification maps at high resolution. Soil profile data extracted from coarse resolution soil maps (1:1 000 000 scale) and topographic and hydrological variables derived from digital elevation model (DEM) data (1:35 000 scale) were considered as candidates for inputs. A high-resolution soil drainage map (1:10 000) of the Black Brook Watershed (BBW) in northwestern New Brunswick (NB), Canada, was used to train and validate the ANN model. Results indicated that the best ANN model included average soil drainage classes, average soil sand content, vertical slope position (VSP), sediment delivery ratio (SDR) and slope steepness as inputs. It was found that 52% of model-predicted drainage classes were exactly the same as field assessment observations and 94% of model-predicted drainage classes were within91 class. In comparison, only 12% of maps indicated drainage classes were the same as field assessment observations based on coarse resolution soil maps and only 55% of points were within 91 class of field assessed drainage classes. Results indicated that the model could be used to produce high-resolution soil drainage maps at relatively low cost.Key words: Soil drainage, artificial neural network model, ANN model, high-resolution soil maps, DEM, hydrology model Zhao, Z., Chow, T. L., Yang, Q., Rees, H. W., Benoy, B., Xing, Z. et Meng, F. R. 2008. Mode`le pre´visionnel des classes de drainage du sol d'apre`s les parame`tres du MAN et les attributs des cartes pe´dologiques a`faible re´solution. Can. J. Soil Sci. 88: 787Á799. Les cartes de drainage du sol a`haute re´solution reveˆtent une grande importance pour la planification des cultures, la gestion des foreˆts et l'e´valuation de l'environnement. Les cartes de classification des sols actuelles ont tendance a`ne fournir de renseignements que sur les principales conditions de drainage et ne conviennent pas a`la planification de la foresterie et de l'agriculture de pre´cision. L'e´tude devait cre´er un mode`le a`re´seau neuronal artificiel (RNA) permettant une classification a`haute re´solution du drainage du sol. Les auteurs ont examine´si on pouvait utiliser a`cette fin les donne´es sur le profil du sol tire´es des cartes a`faible re´solution (e´chelle 1:1 000 000) ainsi que les variables topographiques et hydrologiques du mode`le altime´trique nume´rique (MAN) (e´chelle 1:35 000). Ils ont ensuite utilise´la carte a`haute re´solution de drainage du sol (1:10 000) du bassin...

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Impaired internal drainage and Aphanomyces euteiches root rot of pea caused by soil compaction in a fine-textured soil

Cited by 35 publications

References 30 publications

Variação temporal do intervalo hídrico ótimo de um latossolo vermelho distroférrico sob sistemas de plantio direto

Variação temporal do intervalo hídrico ótimo de um latossolo vermelho distroférrico sob sistemas de plantio direto

Quantification of the soil physical quality of a tropical oxisol using the S index

Model prediction of soil drainage classes based on digital elevation model parameters and soil attributes from coarse resolution soil maps

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