A gradual rather than abrupt increase in soil strength gives better root penetration of strong layers

Clark, L. J.; Ferraris, Stefano; Price, Adam H.; Whalley, W. R.

doi:10.1007/s11104-008-9602-8

Cited by 29 publications

(14 citation statements)

References 18 publications

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“…The contrast between layer 1 and layer 2 was greater in the No-till clay, despite that structural quality was smaller in whole sample soil in No-till loam. Those abrupt changes in soil conditions verified in No-till clay may imply larger decreases in root growth than gradual changes (Clark et al, 2008). A procedure to represent the volume or depth at which the root growth would not be affected by the soil physical quality was not explored by Ball et al (2007).…”

Section: Resultsmentioning

confidence: 99%

Visual soil structure quality assessment on Oxisols under no-tillage system

Giarola¹,

Silva²,

Tormena

et al. 2010

Sci. agric. (Piracicaba, Braz.)

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Methods for evaluation the soil structure quality based on field evaluations are useful to determine strategies for soil management, with the advantage of requirement the use of little equipment and the possibility of immediate interpretation. A new methodology was recently developed to temperate soils for this purpose, called Visual Soil Structure Assessment (Ball et al., 2007). It was tested the hypothesis that it is possible to apply and advance in the interpretation of the results from use of Visual Soils Structure Assessment in cultivated Oxisols. Therefore the goal of this study was to apply, evaluate and enhance the potential of the methodology developed by Ball et al. (2007) in two Oxisols under long-term, no-till in Parana State, Brazil, as well as in a soil under native forest, used as reference of soil structural quality. The proposed implementation and progress in terms of structural quality for the distinct layers provided an assessment of soil physical quality more practical and detailed. This is useful to support the selection of appropriate techniques for mechanical and biological management systems in order to achieve the physical quality of soil suitable for crop development. Visual scores of soil structure quality proposed by Ball et al. (2007) can be applied to Brazilian Oxisols cultivated under no-tillage system. Key words: soil physical quality, soil morphological analysis, soil conservation management Avaliação visual da qualidade da estrutura do solo em Latossolos sob sistema plantio direto RESUMO: Métodos para avaliação da qualidade da estrutura do solo baseados em avaliações de campo são úteis para estabelecer estratégias de manejo do solo, com a vantagem de exigirem a utilização de poucos equipamentos e a possibilidade de interpretações imediatas. Recentemente foi desenvolvido um novo método com este objetivo para solos de clima temperado, denominado Avaliação Visual da Estrutura do Solo (Ball et al., 2007). Testou-se a hipótese que é possível aplicar e avançar na interpretação dos resultados obtidos por meio da Avaliação Visual da Estrutura do Solo em Latossolos cultivados. Para tanto avaliou-se o potencial de utilização da metodologia desenvolvida por Ball et al. (2007)

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Section: Resultsmentioning

confidence: 99%

Visual soil structure quality assessment on Oxisols under no-tillage system

Giarola¹,

Silva²,

Tormena

et al. 2010

Sci. agric. (Piracicaba, Braz.)

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“…There is either a distinct hardpan similar to the ones used in this study, or no hardpan in which soil strength increases steadily with depths 23 , 65 . Such differences in the pattern of subsoil compactions also influenced the root penetration ability even under constant moisture environments in both rice 35 and wheat 64 .…”

Section: Discussionmentioning

confidence: 99%

Plasticity in nodal root elongation through the hardpan triggered by rewatering during soil moisture fluctuation stress in rice

Suralta

Niones

Kano‐Nakata

et al. 2018

Sci Rep

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Rainfed lowland (RFL) rice fields have hardpans and experience soil moisture fluctuations (SMF) stress, which influence root system development. Here, we clarify the expression and timing of the plasticity in nodal root elongation through the hardpan under SMF and its contribution to shoot growth using a shallow-rooting IR64 and its deep-rooting introgression line, YTH304. Under SMF, soil moisture content had negative relationship with soil penetration resistance, regardless of hardpan bulk densities. YTH304 had greater root system below the hardpan than IR64 in hardpan with 1.50 but not in 1.70 g cm−3 bulk density (BD). YTH304 had greater plasticity in nodal root elongation through the hardpan than IR64 under SMF, which was clearly expressed during rewatering. YTH304 also had greater soil water uptake below the hardpan during drought and greater shoot growth than IR64. The results imply that deep root system development during SMF was due to the plasticity in nodal root elongation through the hardpan expressed during rewatering rather than during drought periods. This is against the long standing belief that active root elongation through the hardpan happens during drought. This also implies a need to revisit current root screening methods to identify rice lines with good hardpan penetration ability.

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“…; Clark et al . a,b). A non‐woven fabric used to seal the bottom of soil‐filled pots is considered a potentially attractive alternative for measuring penetration ability since it would be easier to use than wax layers.…”

Section: Introductionmentioning

confidence: 99%

Comparing simple root phenotyping methods on a core set of rice genotypes

et al. 2013

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Interest in belowground plant growth is increasing, especially in relation to arguments that shallow-rooted cultivars are efficient at exploiting soil phosphorus while deep-rooted ones will access water at depth. However, methods for assessing roots in large numbers of plants are diverse and direct comparisons of methods are rare. Three methods for measuring root growth traits were evaluated for utility in discriminating rice cultivars: soil-filled rhizotrons, hydroponics and soil-filled pots whose bottom was sealed with a non-woven fabric (a potential method for assessing root penetration ability). A set of 38 rice genotypes including the OryzaSNP set of 20 cultivars, additional parents of mapping populations and products of marker-assisted selection for root QTLs were assessed. A novel method of image analysis for assessing rooting angles from rhizotron photographs was employed. The non-woven fabric was the easiest yet least discriminatory method, while the rhizotron was highly discriminatory and allowed the most traits to be measured but required more than three times the labour of the other methods. The hydroponics was both easy and discriminatory, allowed temporal measurements, but is most likely to suffer from artefacts. Image analysis of rhizotrons compared favourably to manual methods for discriminating between cultivars. Previous observations that cultivars from the indica subpopulation have shallower rooting angles than aus or japonica cultivars were confirmed in the rhizotrons, and indica and temperate japonicas had lower maximum root lengths in rhizotrons and hydroponics. It is concluded that rhizotrons are the preferred method for root screening, particularly since root angles can be assessed.

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A gradual rather than abrupt increase in soil strength gives better root penetration of strong layers

Cited by 29 publications

References 18 publications

Visual soil structure quality assessment on Oxisols under no-tillage system

Visual soil structure quality assessment on Oxisols under no-tillage system

Plasticity in nodal root elongation through the hardpan triggered by rewatering during soil moisture fluctuation stress in rice

Comparing simple root phenotyping methods on a core set of rice genotypes

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