Root Responses to Alterations in Macroporosity and Penetrability in a Silt Loam Soil

Hernandez‐Ramirez, Guillermo; Lawrence‐Smith, Erin J.; Sinton, S.M.; Tabley, F. J.; Schwen, Andreas; Beare, Michael H.; Brown, Hamish E.

doi:10.2136/sssaj2014.01.0005

Cited by 52 publications

(30 citation statements)

References 27 publications

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“…S4), and root buckling was not observed. As observed for different small-grain cereals in previous studies (Barraclough and Weir, 1988;Materechera et al, 1992;Grzesiak et al, 2013;Hernandez-Ramirez et al, 2014;Colombi and Walter, 2016), root diameters of 2-d-old seedlings increased with increasing soil bulk density (Table I). However, the data obtained from our study strongly suggest that this acclimation of root morphology to increased soil strength was limited by a maximum root diameter.…”

supporting

confidence: 83%

“…This adjustment of roots to increased soil strength reduces the risk of root buckling and decreases the mechanical stress acting on the root during penetration (Materechera et al, 1992;Kirby and Bengough, 2002;Chimungu et al, 2015). Root thickening in response to increased soil strength has been observed in a wide range of species under field and laboratory conditions and often coincides with increased cortical area (Atwell, 1990a;Materechera et al, 1992;Grzesiak et al, 2013;Siczek et al, 2013;Chen et al, 2014;Hernandez-Ramirez et al, 2014;Colombi and Walter, 2016). Since root thickening decreases penetration stress and stabilizes roots, thick roots are likely to be an advantage in soils with increased mechanical impedance (Materechera et al, 1992;Kirby and Bengough, 2002;Chimungu et al, 2015).…”

mentioning

confidence: 99%

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Root Tip Shape Governs Root Elongation Rate under Increased Soil Strength

et al. 2017

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confidence: 83%

mentioning

confidence: 99%

Root Tip Shape Governs Root Elongation Rate under Increased Soil Strength

et al. 2017

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“…The volume of air-filled pores, the content of oxygen in soil air, and its exchange capacity have an enormous effect of the development of plant root systems and on the uptake of nutrients by plants. Macropores make it possible for plant roots to bypass soil zones with excessive mechanical resistance, especially in the deeper genetic horizons [12,14,45]. Soil air capacity considered the minimum is 0.100-m Mesopores with equivalent diameter of 20-0.2 µm retain water usable for plants in the range of soil water potential from -15.5 to -1554 kPa.…”

Section: Discussionmentioning

confidence: 99%

“…Stable aggregate structure prevents excessive compaction of soil and ensures that the soil has a favourable content of capillary pores (with equivalent diameter of 0.2-20 μm) for the retention of water usable for plants, and a suitable content of macropores with diameters >20 μm, which determine the hydraulic conductivity and air capacity and permeability [10][11][12]. Thanks to this, plant roots have unconstrained access both to water and to oxygen contained in soil air.…”

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confidence: 99%

Comparing the Physical Quality of Polish Chernozems Classified in Various Complexes of Agricultural Suitability

Paluszek¹

2016

Pol. J. Environ. Stud.

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“…The soil compaction level can be quantified by the soil density, which increases the soil resistance to penetration (SUZUKI et al, 2007;HERNANDEZ-RAMIREZ et al, 2014;KUNCORO et al, 2014). Soil compaction levels between 2.0 and 2.5 MPa were reported as the critical limits of resistance to penetration for most vegetables (SILVEIRA et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Gas Exchange and Photochemical Efficiency in Lima Bean Genotypes Grown in Compacted Soils

et al. 2018

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-The effects of soil compaction on crop growth and productivity have been well studied in recent years, however, studies on the physiological responses of crops to compaction are scarce. The objective of this study was to evaluate the effect of soil compaction on gas exchange, and photochemical efficiency of lima bean (Phaseolus lunatus L.) genotypes of different growth habits. The experimental design was a randomized block in a 3×4 factorial arrangement, with three lima bean genotypes (Branca-Pequena, Orelha-de-Vó and Roxinha) and four compaction levels (soil densities of 1.1, 1.3, 1.5 and 1.7 g cm -3 ), with four replications. The following variables were evaluated at 38 days after sowing: photosynthetic rate (A), leaf transpiration (E), stomatal conductance (g s ), internal CO 2 concentration (Ci), instantaneous water use efficiency (WUE), intrinsic water use efficiency (iWUE), instantaneous carboxylation efficiency (iCE) and photochemical efficiency (Fo, Fm, Fv and Fv/Fm). The data were subjected to analysis of variance at 5% probability by the F test. The genotypes showed a reduction in the photosynthetic rate with increasing soil compaction. The soil compaction affected the photochemical efficiency of the genotype Orelha-de-Vó, with the Fm and Fv fitting to the linear model, and the Fv/Fm fitting to the quadratic model. The genotype Orelha-de-Vó had the highest rate of E and g s at the soil densities of 1.24 and 1.29 g cm -3 , respectively. Regarding the photosynthetic rate, the genotype Roxinha is more efficient than Branca-Pequena at the soil density of 1.7 g cm -3 .Keywords: Phaseolus lunatus L.. Physical impediment. Photosynthetic rate. TROCAS GASOSAS E EFICIÊNCIA FOTOQUÍMICA DE GENÓTIPOS DE FAVA CULTIVADOS EM SOLO COMPACTADORESUMO -Os efeitos da compactação do solo no crescimento e produtividade das culturas têm sido muito estudados nos últimos anos, porém, as respostas fisiológicas das culturas à compactação não têm recebido a devida atenção. Objetivou-se avaliar o efeito da compactação do solo nas trocas gasosas e na eficiência fotoquímica de genótipos de fava (Phaseolus lunatus L.) de diferentes hábitos de crescimento. O delineamento experimental utilizado foi em blocos casualizados no arranjo fatorial 3 × 4, sendo três genótipos de fava (Branca pequena, Orelha de vó e Roxinha) e quatro níveis de compactação (densidades de solo de 1,1; 1,3; 1,5 e 1,7 g cm -3 ), com quatro repetições. Aos 38 dias após a semeadura, analisaram-se as seguintes variáveis: taxa fotossintética (A), transpiração foliar (E), condutância estomática (g s ), concentração interna de CO 2 (Ci), eficiência instantânea no uso da água (EUA), eficiência intrínseca no uso da água (EIUA), eficiência instantânea de carboxilação (EiC) e eficiência fotoquímica (Fo, Fm, Fv e Fv/Fm). Os dados foram submetidos à análise de variância a 5% de probabilidade pelo teste F. Os genótipos apresentaram redução na taxa fotossintética com aumento da compactação do solo. Houve efeito da compactação do solo na eficiência fotoquímica apenas par...

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Root Responses to Alterations in Macroporosity and Penetrability in a Silt Loam Soil

Cited by 52 publications

References 27 publications

Root Tip Shape Governs Root Elongation Rate under Increased Soil Strength

Root Tip Shape Governs Root Elongation Rate under Increased Soil Strength

Comparing the Physical Quality of Polish Chernozems Classified in Various Complexes of Agricultural Suitability

Gas Exchange and Photochemical Efficiency in Lima Bean Genotypes Grown in Compacted Soils

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