Advances and challenges in predicting agricultural management effects on soil hydraulic properties

Green, Timothy R.; Ahuja, Lajpat R.; Benjamin, Joseph G.

doi:10.1016/s0016-7061(03)00091-0

Cited by 185 publications

(130 citation statements)

References 99 publications

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“…θ ma was not affected by the crop. The results show that in this soil only the connectivity and conductivity of macropores were affected, while the total volume did not change over time and with the crop, which is in agreement with the fact that soil compaction affects not only pore volume but also soil pore configuration (Green et al, 2003;Horn et al, 2003). The complex behavior of ε maR and ε meR can be explained by the fact that K depends on water-conducting porosity and on R 0 (Reynolds et al, 1995).…”

Section: Last Crop Effects On Soil Hydraulic Properties and On Soil Psupporting

confidence: 85%

Stabilization of soil hydraulic properties under a long term no-till system

Lozano

Soracco

Buda

et al. 2014

Rev. Bras. Ciênc. Solo

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SUMMARYThe area under the no-tillage system (NT) has been increasing over the last few years. Some authors indicate that stabilization of soil physical properties is reached after some years under NT while other authors debate this. The objective of this study was to determine the effect of the last crop in the rotation sequence (1 st year: maize, 2 nd year: soybean, 3 rd year: wheat/soybean) on soil pore configuration and hydraulic properties in two different soils (site 1: loam, site 2: sandy loam) from the Argentinean Pampas region under long-term NT treatments in order to determine if stabilization of soil physical properties is reached apart from a specific time in the crop sequence. In addition, we compared two procedures for evaluating water-conducting macroporosities, and evaluated the efficiency of the pedotransfer function ROSETTA in estimating the parameters of the van Genuchten-Mualem (VGM) model in these soils. Soil pore configuration and hydraulic properties were not stable and changed according to the crop sequence and the last crop grown in both sites. For both sites, saturated hydraulic conductivity, K 0 , water-conducting macroporosity, ε ε ε ε ε ma , and flow-weighted mean pore radius, R 0ma , increased from the 1 st to the 2 nd year of the crop sequence, and this was attributed to the creation of water-conducting macropores by the maize roots. The VGM model adequately described the water retention curve (WRC) for these soils, but not the hydraulic conductivity (K) vs tension (h) curve. The ROSETTA function failed in the estimation of these parameters. In summary, mean values of K 0 ranged from 0.74 to 3.88 cm h -1 . In studies on NT effects on soil physical properties, the crop effect must be considered.Index terms: infiltration, crop rotation, water-conducting porosity, no tillage, texture.( RESUMO: ESTABILIDADE DAS PROPRIEDADES HIDRÁULICAS DO SOLO EM UM SISTEMA DE PLANTIO DIRETO EM LONGO PRAZONos últimos anos, o sistema plantio direto (NT) tem aumentado. Alguns autores indicam que os atributos físicos do solo ficam estáveis após anos cultivando nesse sistema, sendo esse fato discutido por outros autores. O objetivo deste trabalho foi avaliar o efeito do último cultivo após a rotação (1º ano: milho; 2º ano: soja; e 3º ano: trigo/soja) sobre a configuração do sistema poroso do solo e das suas propriedades hidráulicas de diferentes tipos de textura (solo 1: franco; e solo 2: franco-arenoso) da região do pampa argentino, em NT por um longo prazo, para determinar se a estabilidade das propriedades físicas do solo independe do momento da rotação. Adicionalmente, foram comparados os procedimentos para avaliar a macroporosidade, bem como avaliada a eficiência da função de pedotransferência ROSETTA, para estimar os parâmetros do modelo de van Genuchten-Mualen (VGM) desses solos. A configuração do sistema poroso do solo e as propriedades hidráulicas não foram estáveis e se alteraram em razão da rotação da cultura e do último cultivo utilizado na rotação em ambos os solos. Nos dois locais, a condutiv...

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Section: Last Crop Effects On Soil Hydraulic Properties and On Soil Psupporting

confidence: 85%

Stabilization of soil hydraulic properties under a long term no-till system

Lozano

Soracco

Buda

et al. 2014

Rev. Bras. Ciênc. Solo

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“…Comprehensive reviews have been presented by Green et al (2003), Strudley et al (2008) and Anderson (2011). A main effect of reduced tillage systems on water flow processes is related to residue cover, which has already been discussed above.…”

Section: Tillage Systemsmentioning

confidence: 99%

Management of crop water under drought: a review

Bodner

Nakhforoosh

Kaul

2015

Agron. Sustain. Dev.

455

234

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Drought is a predominant cause of low yields worldwide. There is an urgent need for more water efficient cropping systems facing large water consumption of irrigated agriculture and high unproductive losses via runoff and evaporation. Identification of yield-limiting constraints in the plant-soil-atmosphere continuum are the key to improved management of plant water stress. Crop ecology provides a systematic approach for this purpose integrating soil hydrology and plant physiology into the context of crop production. We review main climate, soil and plant properties and processes that determine yield in different water-limited environments. From this analysis, management measures for cropping systems under specific drought conditions are derived. Major findings from literature analysis are as follows. (1) Unproductive water losses such as evaporation and runoff increase from continental in-season rainfall climates to storage-dependent winter rainfall climates. Highest losses occur under tropical residual moisture regimes with short intense rainy season. (2) Sites with a climatic dry season require adaptation via phenology and water saving to ensure stable yields. Intermittent droughts can be buffered via the root system, which is still largely underutilised for better stress resistance. (3) At short-term better management options such as mulching and date of seeding allow to adjust cropping systems to site constraints. Adapted cultivars can improve the synchronisation between crop water demand and soil supply. At long term, soil hydraulic and plant physiological constraints can be overcome by changing tillage systems and breeding new varieties with higher stress resistance. (4) Interactions between plant and soil, particularly in the rhizosphere, are a way towards better crop water supply. Targeted management of such plant-soil interactions is still at infancy.We conclude that understanding site-specific stress hydrology is imperative to select the most efficient measures to mitigate stress. Major progress in future can be expected from crop ecology focussing on the management of complex plant (root)-soil interactions.

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“…However, in practice in the top soil, so-called compaction events are usually a combination of densification and shear deformation. Green et al (2003) have reviewed the effects of various types of soil deformation on hydraulic conductivity. Their conclusion, in agreement with many other studies (Matthews et al, 2010;Reynolds et al, 2008;Wang and Huang, 1984), is that saturated hydraulic conductivity is very sensitive to changes in porosity.…”

Section: Introductionmentioning

confidence: 99%