The Ideal Soil: II. Critical Values of an “Ideal Soil,” for Mollisols in the North of the Pampean Region (in Argentina)

Pilatti, Miguel Angel; Orellana, Jorge A. de

doi:10.1300/j064v17n01_08

Cited by 10 publications

(10 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Soil PR values determined here exceeded both threshold limits by far. In Argentina, Pilatti & Orellana (2000) observed that a threshold of 6 MPa is more suitable for Pampean soils similar to those studied here, using a 60 ° probe.…”

Section: Soil Penetrometer Resistancesupporting

confidence: 74%

See 1 more Smart Citation

Root abundance of maize in conventionally-tilled and zero-tilled soils of Argentina

Taboada

Álvarez

2008

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

SUMMARYMaize root growth is negatively affected by compacted layers in the surface (e.g. agricultural traffic) and subsoil layers (e.g. claypans). Both kinds of soil mechanical impedances often coexist in maize fields, but the combined effects on root growth have seldom been studied. Soil physical properties and maize root abundance were determined in three different soils of the Rolling Pampa of Argentina, in conventionally-tilled (CT) and zero-tilled (ZT) fields cultivated with maize. In the soil with a light Bt horizon (loamy Typic Argiudoll, Chivilcoy site), induced plough pans were detected in CT plots at a depth of 0-0.12 m through significant increases in bulk density (1.15 to 1.27 Mg m -3 ) and cone (tip angle of 60 º) penetrometer resistance (7.18 to 9.37 MPa in summer from ZT to CT, respectively). This caused a reduction in maize root abundance of 40-80 % in CT compared to ZT plots below the induced pans. Two of the studied soils had hard-structured Bt horizons (clay pans), but in only one of them (silty clay loam Abruptic Argiudoll, Villa Lía site) the expected penetrometer resistance increases (up to 9 MPa) were observed with depth. In the other clay pan soil (silty clay loam Vertic Argiudoll, Pérez Millán site), penetrometer resistance did not increase with depth but reached 14.5 MPa at 0.075 and 0.2 m depth in CT and ZT plots, respectively. However, maize root abundance was stratified in the first 0.2 m at the Villa Lía and Pérez Millán sites. There, the hard Bt horizons did not represent an absolute but a relative mechanical impedance to maize roots, by the observed root clumping through desiccation cracks.Index terms: zero tillage, conventional tillage, soil compaction, root growth.( O crescimento das raízes do milho é alterado negativamente quando o solo apresenta camadas compactadas superficiais (trânsito de maquinário) ou subsuperficiais (camada argilosa). Os dois tipos de impedimentos mecânicos muitas vezes coexistem nos campos sob cultura de milho, porém seus efeitos combinados no crescimento das raízes do milho foram raramente estudados. As propriedades físicas do solo e a abundância de raízes de milho foram estudadas em três diferentes solos da região do Pampa Ondulado, na Argentina, que foram cultivados em parcelas próximas com milho em preparo convencional e em plantio direto. No solo com um horizonte Bt incipiente (Argiudol típico franco, local Chivilcoy), as compactações induzidas pelo preparo foram identificadas nas parcelas sob preparo convencional na profundidade de 0-12 cm por meio de significativos incrementos na densidade aparente (1,15 e 1,27 Mg m -3 ) e na resistência à penetração com penetrômetro de cone (ponta com ângulo de 60° ), com valores de 9,37 e 7,18 MPa, no verão, nas parcelas sob preparo convencional e plantio direto, respectivamente. Isso ocasionou diminuição da abundância nas raízes do milho entre 40 e 80 % sob preparo convencional, se comparado com plantio direto, abaixo das compactações induzidas. Dois dos solos estudados tinham horizontes Bt fortemente estrutura...

show abstract

Section: Soil Penetrometer Resistancesupporting

confidence: 74%

“…Unlike the desiccated upper horizons, higher GWC was determined at this depth (Table 4). The combined action of water and clay plasticity may have allowed an easy penetration of the probe in this clayey subsoil (Pilatti & Orellana, 2000).…”

Section: Soil Penetrometer Resistancementioning

confidence: 99%

Root abundance of maize in conventionally-tilled and zero-tilled soils of Argentina

Taboada

Álvarez

2008

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

show abstract

“…Various disciplines related to agronomy have proposed to characterize an 'ideal' soil either (i) according to individual parameters such as base-cation saturation ratio (Kopittke and Menzies 2007), moisture (Keen 1924), and capillary pull (Hackett and Strettan 1928), or (ii) through integrated parameters (De Orellana and Pilatti 1999;Janssen and de Willigen 2006;Pilatti and de Orellana 2000).…”

Section: Issues For Agronomistsmentioning

confidence: 99%

Redox potential (Eh) and pH as drivers of soil/plant/microorganism systems: a transdisciplinary overview pointing to integrative opportunities for agronomy

2012

View full text Add to dashboard Cite

Background Oxidation-reduction and acid-base reactions are essential for the maintenance of all living organisms. However, redox potential (Eh) has received little attention in agronomy, unlike pH, which is regarded as a master variable. Agronomists are probably depriving themselves of a key factor in crop and soil science which could be a useful integrative tool. Scope This paper reviews the existing literature on Eh in various disciplines connected to agronomy, whether associated or not with pH, and then integrates this knowledge within a composite framework. Conclusions This transdisciplinary review offers evidence that Eh and pH are respectively and jointly major drivers of soil/plant/microorganism systems. Information on the roles of Eh and pH in plant and microorganism physiology and in soil genesis converges to form an operational framework for further studies of soil/plant/microorganism functioning. This framework is based on the hypothesis that plants physiologically function within a specific internal Eh-pH range and that, along with microorganisms, they alter Eh and pH in the rhizosphere to ensure homeostasis at the cell level. This new perspective could help in bridging several disciplines related to agronomy, and across micro and macro-scales. It should help to improve cropping systems design and management, in conventional, organic, and conservation agriculture.

show abstract

“…Changes in soil hydraulic parameters, such as pores size, number and connectivity, hydraulic conductivity, water flow, and water infiltration, as well changes in soil structure characteristics, such as form, size, dry-aggregation degree, aggregates stability, soil resistance to penetration, and bulk density were measured for several authors to evaluate soils degradation [ 19 – 21 ]. In addition, some researches were developed to evaluate the LLWR response to several tillage systems [ 6 , 8 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Physical Quality Indicators and Mechanical Behavior of Agricultural Soils of Argentina

et al. 2016

Self Cite

View full text Add to dashboard Cite

Mollisols of Santa Fe have different tilth and load support capacity. Despite the importance of these attributes to achieve a sustainable crop production, few information is available. The objectives of this study are i) to assess soil physical indicators related to plant growth and to soil mechanical behavior; and ii) to establish relationships to estimate the impact of soil loading on the soil quality to plant growth. The study was carried out on Argiudolls and Hapludolls of Santa Fe. Soil samples were collected to determine texture, organic matter content, bulk density, water retention curve, soil resistance to penetration, least limiting water range, critical bulk density for plant growth, compression index, pre-consolidation pressure and soil compressibility. Water retention curve and soil resistance to penetration were linearly and significantly related to clay and organic matter (R2 = 0.91 and R2 = 0.84). The pedotransfer functions of water retention curve and soil resistance to penetration allowed the estimation of the least limiting water range and critical bulk density for plant growth. A significant nonlinear relationship was found between critical bulk density for plant growth and clay content (R2 = 0.98). Compression index was significantly related to bulk density, water content, organic matter and clay plus silt content (R2 = 0.77). Pre-consolidation pressure was significantly related to organic matter, clay and water content (R2 = 0.77). Soil compressibility was significantly related to initial soil bulk density, clay and water content. A nonlinear and significantly pedotransfer function (R2 = 0.88) was developed to predict the maximum acceptable pressure to be applied during tillage operations by introducing critical bulk density for plant growth in the compression model. The developed pedotransfer function provides a useful tool to link the mechanical behavior and tilth of the soils studied.

show abstract

The Ideal Soil: II. Critical Values of an “Ideal Soil,” for Mollisols in the North of the Pampean Region (in Argentina)

Cited by 10 publications

References 8 publications

Root abundance of maize in conventionally-tilled and zero-tilled soils of Argentina

Root abundance of maize in conventionally-tilled and zero-tilled soils of Argentina

Redox potential (Eh) and pH as drivers of soil/plant/microorganism systems: a transdisciplinary overview pointing to integrative opportunities for agronomy

Physical Quality Indicators and Mechanical Behavior of Agricultural Soils of Argentina

Contact Info

Product

Resources

About