Mechanistic framework to link root growth models with weather and soil physical properties, including example applications to soybean growth in Brazil

Moraes, Moacir Tuzzin de; Bengough, A. Glyn; Debiasi, Henrique; Franchini, J. C.; Levien, Renato; Schnepf, Andrea; Leitner, Daniel

doi:10.1007/s11104-018-3656-z

Cited by 51 publications

(62 citation statements)

References 82 publications

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“…Under this condition, tractor traffic intensification caused soil compaction states not harmful to soybean plants, maintaining satisfactory physical and hydraulic conditions to the crop performance (Moraes et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

Soybean Agronomic Performance and Soil Physical Attributes Under Tractor Traffic Intensities

et al. 2020

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Machinery traffic intensification has been recurrent in intensive agriculture in annual crops, which may lead to structural soil degradation and, consequently, a reduction of its productive capacity. Therefore, this study aimed to assess the influence of tractor traffic intensification on soil physical attributes and soybean yield components. The study was performed in an Oxisol under no-tillage for 10 years, using a randomized block design with five tractor traffic intensities (0, 2, 4, 6, 8, and 12 passes) and five replications. Density, porosity, macroporosity, microporosity, and penetration resistance were assessed in the soil and stem diameter, number of pods per plant, number of grains per pod, grain weight per plant, thousand-grain weight, and grain yield were assessed in the soybean crop. Tractor traffic intensification changed soil physical attributes, which were not limiting factors to soybean yield under the no-tillage system, providing higher stem diameter, number of pods per plant, grain weight per plant, and grain yield after 12 passes.

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Section: Resultsmentioning

confidence: 99%

Soybean Agronomic Performance and Soil Physical Attributes Under Tractor Traffic Intensities

et al. 2020

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“…These models, however, are usually based on simplifying assumptions such as a uniform root distribution and homogeneous root water uptake in lateral soil horizons. The effect of soil structure is thereby at best taken into account indirectly via stress functions on root elongation (e.g., de Moraes et al, 2018; Gaiser et al, 2013). If the impact of biopores on model input parameters such as root length density development, root system hydraulic conductance, and the relative distribution of root water uptake is known, the effects of structured soil can be taken into account more accurately.…”

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confidence: 99%

Modeling the Impact of Biopores on Root Growth and Root Water Uptake

Landl

Schnepf

Uteau³

et al. 2019

Vadose Zone Journal

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Core Ideas A 3D soil–root model was used to investigate root–biopore interactions. Known effects of biopores on root growth, i.e., increased root length and depth were reproduced. Despite reducing root–soil contact, biopores led to increased water uptake in dry periods. Biopores had a larger impact on water uptake for more compact and less conductive soils. Roots are known to use biopores as preferential growth pathways to overcome hard soil layers and access subsoil water resources. This study evaluates root–biopore interactions at the root‐system scale under different soil physical and environmental conditions using a mechanistic simulation model and extensive experimental field data. In a field experiment, spring wheat (Triticum aestivum L.) was grown on silt loam with a large biopore density. X‐ray computed tomography scans of soil columns from the field site were used to provide a realistic biopore network as input for the three‐dimensional numerical R‐SWMS model, which was then applied to simulate root architecture as well as water flow in the root–biopore–soil continuum. The model was calibrated against observed root length densities in both the bulk soil and biopores by optimizing root growth model input parameters. By implementing known interactions between root growth and soil penetration resistance into our model, we could simulate root systems whose response to biopores in the soil corresponded well to experimental observations described in the literature, such as increased total root length and increased rooting depth. For all considered soil physical (soil texture and bulk density) and environmental conditions (years of varying dryness), we found biopores to substantially mitigate transpiration deficits in times of drought by allowing roots to take up water from wetter and deeper soil layers. This was even the case when assuming reduced root water uptake in biopores due to limited root–soil contact. The beneficial impact of biopores on root water uptake was larger for more compact and less conductive soils.

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“…Consequently the structural quality of the soil showed that an increase in C was positively associated with the reduction in ρ b (Figure 5). However, taking into consideration the high values of ρ b and reduced macroporosity, and values observed in the pasture areas (Table 3), these benefits to the soil structure provided by the successive use of LSM are still very limited and are insufficient to fully alleviate limiting conditions induced by soil compaction to ensure suitable root growth (Moraes et al, 2018).…”

Section: Impacts Of Lsm Applications On Soil Physical Attributesmentioning

confidence: 99%

Changes in soil chemical and physical properties in pasture fertilised with liquid swine manure

Scheid¹,

Silva

et al. 2020

Sci. agric. (Piracicaba, Braz.)

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Chemical and physical properties of soil can be altered with the successive application of liquid swine manure (LSM), also known as slurry. Therefore, monitoring the impact of LSM is essential to an assessment of the potential agronomic and environmental benefits and risks associated with management practices. The aim of this study was to evaluate the effects of LSM on the chemical and physical attributes of soil under pasture (Cynodon spp.), located in southern Brazil. Four areas were sampled: three areas cultivated with Cynodon spp. pasture with successive applications of 200 m 3 ha -1 y -1 of LSM for three, eight and 15 years; and untreated native forest as a reference. The soil attributes evaluated were: organic carbon (OC), active (pH water) and potential acidity (H + Al + 3 ), nutrient availability (i.e., P, K, Ca, Mg, Cu and Zn), soil bulk density, macro, micro and total porosity. Successive applications of LSM on pasture reduced soil active acidity, and increased the soil organic C and plant-available N, P, Ca, Mg, Cu and Zn contents. These effects were more intense with time and in the shallowest layers, i.e. 0-10 cm.Excessive increases in P, Cu and Zn in the soil should be carefully monitored to minimize the contamination risks to soil, ground and surface waters. Soil physical attribute changes were more associated with land use (pasture versus native forest) than LSM use, and LSM applications induced slight improvements in the soil structural quality over time.

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Mechanistic framework to link root growth models with weather and soil physical properties, including example applications to soybean growth in Brazil

Abstract: 2018). Mechanistic framework to link root growth models with weather and soil physical properties, including example applications to soybean growth in Brazil. Plant and Soil,, 67-92. https://doi.

Cited by 51 publications

References 82 publications

Soybean Agronomic Performance and Soil Physical Attributes Under Tractor Traffic Intensities

Soybean Agronomic Performance and Soil Physical Attributes Under Tractor Traffic Intensities

Modeling the Impact of Biopores on Root Growth and Root Water Uptake

Changes in soil chemical and physical properties in pasture fertilised with liquid swine manure

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