Factors Influencing Point Measurement of Near‐surface Saturated Soil Hydraulic Conductivity in a Small Sicilian Basin

Baiamonte, Giorgio; Bagarello, Vincenzo; D’Asaro, Francesco; Palmeri, Vincenzo

doi:10.1002/ldr.2674

Cited by 32 publications

(13 citation statements)

References 94 publications

(147 reference statements)

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“…The parametric equations described by Liu et al [61] are used to calculate CR and DP. The water balance is highly affected by runoff, RO, [62], which in turn is highly influenced by the soil's hydrological characteristics [63,64]. AQUACROP estimates RO by using the curve number approach [65], and splits the maximum ET component, ET c , in maximum soil evaporation, E s (mm), and maximum crop transpiration, T c (mm), which are estimated as:…”

Section: Model Descriptionmentioning

confidence: 99%

Effects of Biochar on Irrigation Management and Water Use Efficiency for Three Different Crops in a Desert Sandy Soil

2020

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This paper aimed at investigating if the application of biochar (BC) to desert sand (DS) from the United Arab Emirates (UAE), characterized by a very poor soil-water retention (SWR) and by a very low value of the maximum water available for crops (AWmax), could positively affect soil water balance, by reducing the irrigation needs (VIRR) and improving the irrigation water use efficiency (IWUE) and the water use efficiency (WUE). The analysis was performed for three crops, i.e., wheat (Triticum aestivum), sorghum (Sorghum vulgare) and tomato (Lycopersicon esculentum). BC was applied to the DS at different fractions, fBC (fBC = 0, 0.091, 0.23 and 0.33). Drip irrigation was adopted as a highly efficient water saving method, which is particularly relevant in arid, water-scarce countries. Soil water balance and irrigation scheduling were simulated by application of the AQUACROP model, using as input the SWR measured without and with BC addition. The effect of BC was investigated under either a no-water stress (NWS) condition for the crops or deficit irrigation (DI). The results showed that the application of BC made it possible to reduce the predicted VIRR and to increase the IWUE under the NWS scenario, especially for wheat and sorghum, with less evident benefits for tomato. When a deficit irrigation (DI) was considered, even at the lowest considered fBC (0.091), BC counterbalanced the lower VIRR provided under DI, thus mitigating the yield reduction due to water stress, and improved the WUE. The influence of BC was more pronounced in wheat and tomato than in sorghum. The results evidenced that the application of BC could be a potential strategy for saving irrigation water and/or reducing the effects of drought stress in desert sand. This means that biochar could be used a management option to promote local production and reduce the dependency on food import, not only in the UAE, but also in other countries with extremely arid climatic conditions and large extensions of sandy soils similar to the considered DS.

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Section: Model Descriptionmentioning

confidence: 99%

Effects of Biochar on Irrigation Management and Water Use Efficiency for Three Different Crops in a Desert Sandy Soil

2020

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“…It should be observed that the latter option differs from the usual logical hydraulic design sequence, where first the emitter's flow rate is fixed, and then the inside lateral diameter is calculated. In fact, the emitter's flow rate is usually determined in the previous agronomic design, according to the wetted soil volume, the root length and the soil's hydrological characteristics that may be highly spatially variable, even in small cultivated areas (Baiamonte et al, ).…”

Section: Deriving Analytical Solution Accounting For Minor Lossesmentioning

confidence: 99%

Minor Losses and Best Manifold Position in the Optimal Design of Paired Sloped Drip Laterals

Baiamonte

2018

Irrigation and Drainage

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Arranging paired laterals so that two distribution pipes extend in opposite directions from a common manifold contributes to providing more uniform pressure to all laterals in the system, increasing water use and energy efficiency of micro‐irrigation. Towards this end, by neglecting emitters’ minor losses, analytical procedures to design paired drip laterals laid on uniform slopes were introduced. More recently, it was shown that for an optimal paired sloped lateral design the best position of the manifold (BMP) equals 24%. In this paper, first the mentioned analytical procedure is extended to the case in which minor losses are considered. Second, by neglecting minor losses, a comparison in terms of energy saving, between designing paired sloped drip laterals by fixing BMP = 0.24 and other suggested manifold position from the literature, is performed. Third, it is shown that fixing BMP = 24% of the optimal lateral length can be also applied when minor losses are taken into account. By considering the minor losses of integrated emitters, some practical solutions are presented. The procedure proposed here was compared with that derived by the step‐by‐step exact procedure. Applications by considering different design variables are performed and discussed. © 2018 John Wiley & Sons, Ltd.

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“…Saturated soil hydraulic conductivity (K Sat ) is a key soil attribute for understanding the soil water movement phenomenon and is therefore one of the main inputs used in hydrological models. Several studies have reported that K Sat values are affected by the variation of pore space geometry (Baiamonte et al 2017), topography (Wang et al 2013), land use (Price et al 2010;Salemi et al 2013;Pinto et al 2019), and scale (Picciafuoco et al 2019). It has also been well documented in the literature that K sat is highly variable in space (Wang et al 2013;Papanicolaou et al 2015;She et al 2017).…”

Section: Introductionmentioning

confidence: 95%

Identifying Covariates to Assess the Spatial Variability of Saturated Soil Hydraulic Conductivity Using Robust Cokriging at the Watershed Scale

Soares

Centeno

Timm

et al. 2020

J Soil Sci Plant Nutr

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The mapping of saturated soil hydraulic conductivity (K Sat) is essential to understanding soil water dynamics and is a sensitive input in hydrological modeling. The objectives of this study were to provide a reference for the selection of soil hydrology and other environmental attributes that can be used as covariates for estimating K Sat and to compare the efficiency of univariate ordinary kriging versus ordinary robust cokriging, using selected soil hydrology and environmental attributes. Data sets were obtained from a sample grid of 179 points established in the Ellert creek watershed (ECW), located in Rio Grande do Sul state, Southern Brazil. K Sat , macroporosity, microporosity, total porosity, and bulk density were determined from soil sampled at each point. Data of land use and elevation were also applied. All data sets were firstly submitted to classical statistics. Boxplot graphics were constructed to evaluate the relationship between K Sat and land uses. Spearman coefficient of correlation between K Sat and the other attributes was also assessed. For the assortment of covariates, cluster analysis was applied. Classical and robust estimators were applied to calculate the auto and cross-semivariograms and hereafter the ordinary kriging and cokriging. The Spearman coefficient showed some inconsistencies among the applied variables, suggesting that the multivariate method was more appropriate. All cross-semivariograms, except for land use, showed results with better accuracy than the auto-semivariograms. From the methods applied, the best estimates of K Sat were obtained using the robust cokriging method, using macroporosity and soil bulk density as covariates.

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Factors Influencing Point Measurement of Near‐surface Saturated Soil Hydraulic Conductivity in a Small Sicilian Basin

Cited by 32 publications

References 94 publications

Effects of Biochar on Irrigation Management and Water Use Efficiency for Three Different Crops in a Desert Sandy Soil

Effects of Biochar on Irrigation Management and Water Use Efficiency for Three Different Crops in a Desert Sandy Soil

Minor Losses and Best Manifold Position in the Optimal Design of Paired Sloped Drip Laterals

Identifying Covariates to Assess the Spatial Variability of Saturated Soil Hydraulic Conductivity Using Robust Cokriging at the Watershed Scale

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