ORCID Profile
0000-0003-1436-174X
Current Organisations
Urmia University
,
University of Queensland
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Publisher: Springer Berlin Heidelberg
Date: 04-12-2012
Publisher: Springer Science and Business Media LLC
Date: 04-01-2021
Publisher: Springer Science and Business Media LLC
Date: 06-12-2019
Publisher: Wiley
Date: 05-2022
DOI: 10.1111/EJSS.13244
Abstract: Soil bulk density ( ρ b ) is an important indicator of soil quality, productivity, compaction and porosity. Despite its importance, ρ b is often omitted from global datasets due to the costs of making many direct ρ b measurements and the difficulty of direct measurement on rocky, sandy, very dry, or very wet soils. Pedotransfer functions (PTFs) are deployed to address these limitations. Using readily available soil properties, PTFs employ estimator equations to fit existing datasets to estimate properties like ρ b . However, PTF performance often declines when applied to soils outside those in the training dataset. Potentially, recalibrating existing PTFs using new observations would leverage the power of large datasets used in the original PTF derivation, while updating information based on new soil observations. Here, we evaluate such a recalibration approach for ρ b estimation, benchmarking its performance against two alternatives: the original, uncalibrated PTFs, and novel, local PTFs derived solely from new soil observations. Using a ρ b dataset of N = 360 total observations obtained in West Azerbaijan, Iran, we varied the local dataset size (with N = 15, 30, 60, and 360) and recalibrated four existing PTFs with these data. Local PTFs were generated based on stepwise multiple linear regression for the same datasets. The same PTFs (original, recalibrated, and local) were also applied to the study area, and the resulting ρ b estimates were compared with the global SoilGrids dataset. Recalibration of PTFs reduced errors relative to the original uncalibrated PTFs for instance, the NSE increased from −22.07 to 0.30 (uncalibrated) to 0.20–0.41 (recalibrated), and RMSE decreased from 0.12 to 0.60 Mg m −3 (uncalibrated) to 0.10–0.13 Mg m −3 (recalibrated). The recalibrated PTFs performance was comparable to or better than local PTFs applied to the same data. Recalibration of existing PTFs with local/regional uses provides a viable alternative to the use of global datasets or the development of local PTFs in data‐scarce regions. Existing global PTFs were calibrated and tested using a small dataset for local utilisation. Several new local PTFs were also developed using the same datasets. Recalibration of existing global PTFs is comparable to or more accurate than developing new PTFs.
Publisher: Informa UK Limited
Date: 07-04-2014
Publisher: Elsevier BV
Date: 11-2020
Publisher: Wiley
Date: 10-02-2010
Publisher: Informa UK Limited
Date: 08-04-2020
Publisher: Wiley
Date: 06-02-2018
Publisher: Informa UK Limited
Date: 12-12-2013
Publisher: Springer Science and Business Media LLC
Date: 03-03-2012
Publisher: Springer Science and Business Media LLC
Date: 16-05-2018
Publisher: CSIRO Publishing
Date: 04-04-2022
DOI: 10.1071/CP21676
Abstract: Context Salinity is a major cause of yield loss in wheat globally. Aims and Methods To investigate the potential of silicon to minimise the effect of salinity in wheat, experiments were conducted using outdoor pots subjected to seven salinity treatments. Silicon (as potassium silicate K2SiO3) was applied as both a priming agent and foliar spray. Selected response functions were used to quantify wheat response to salinity as affected by silicon application. Key results Concentration of chlorophyll a, chlorophyll b and carotenoid decreased by 4.2, 3.6 and 1.4 mg/g FW respectively with increasing salinity up to an electrical conductivity of 14 dS/m. Increasing salinity levels increased maximum variable chlorophyll fluorescence yield in a dark-adapted state and decreased the photochemical quenching coefficient, the nonphotochemical quenching coefficient, non-photochemical quenching, actual quantum yield of PSII electron transport in the light-adapted state, and the apparent photosynthetic electron transport rate. The maximal efficiency of PSII photochemistry in the dark-adapted state was not significantly influenced by salinity. The response functions showed that the salinity threshold value and the salinity at which a given trait was reduced by 50% (EC50) were 5.7 and 12.1 dS/m, respectively. Conclusions The combined treatment of silicon (priming × foliar spray) was found to be the most effective, increasing salinity threshold value and EC50 by 32 and 2% respectively. Implications These findings give insight into the effects of salinity on wheat and demonstrate the potential of silicon applications to promote crop health in saline environments.
Publisher: Elsevier BV
Date: 06-2012
Publisher: Springer Science and Business Media LLC
Date: 2021
Publisher: Informa UK Limited
Date: 18-05-2015
Publisher: Informa UK Limited
Date: 04-05-2022
Publisher: Informa UK Limited
Date: 10-2011
Publisher: Elsevier BV
Date: 03-2011
Publisher: Springer Science and Business Media LLC
Date: 06-2020
Publisher: Springer Science and Business Media LLC
Date: 30-03-2019
DOI: 10.1007/S10661-019-7393-4
Abstract: In order to study the effect of biochar application as simple and enriched, on the soil nutrients status in the salinity conditions, a research was conducted as a factorial arrangement based on completely randomized design (CRD) with three replicates. The biochar (grape pruning residues) was applied in three levels (0, 2% biochar, and 2% enriched biochar by rock phosphate and cow manure). Also, the salinity treatment was considered in three levels (2, 4.5, and 9 dSm
Publisher: Elsevier BV
Date: 05-2021
Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 10-2017
Publisher: Wiley
Date: 31-01-2018
Publisher: CSIRO Publishing
Date: 2011
DOI: 10.1071/SR10156
Abstract: Little information is available for cadmium (Cd) sorption/desorption behaviour in soils with relatively variable CaCO3 content. The objectives of this study were to: (i) parameterise the sorption and desorption of Cd and the hysteretic behaviour of Cd sorbed to soils with varying CaCO3 content and (ii) correlate sorption, desorption, and retention parameters with physicochemical characteristics of the soils. Twenty soil s les of different physico-chemical properties were taken from agricultural regions of Western Azerbijan province, Iran. A batch equilibrium experiment was conducted to construct sorption/desorption curves of Cd. The linear, Langmuir, and Freundlich isotherm equations were fitted to the experimental data of Cd sorption and retention, using either linear regression procedure or nonlinear least square optimisation (LSO). Both the Freundlich and Langmuir approaches described the Cd sorption and retention data well. A strong and irreversible binding of Cd in the soils was recorded, using a desorption approach. In the case of Cd sorption, a significant positive correlation (r = 0.38, P ≤ 0.05) was found between the Freundlich constant (Kf) and active CaCO3 equivalent (ACCE). The Freundlich n was positively correlated with cation exchange capacity (r = 0.49, P ≤ 0.05) and clay (r = 0.61, P ≤ 0.01) and negatively with ACCE (r = –0.60, P ≤ 0.01). The soil partition coefficient (KSD) showed a positive correlation with ACCE. The sorption maxima (b) were much less than the cation exchange capacity of soils. However, the relatively high pH (7.0–8.0) of the experimental soils and presence of relatively high values of free and active carbonate in the soils, along with the large sorption capacity of the soils, suggest the possibility of solid-phase precipitation as octavite (CdCO3). Parameter b, when fitted through LSO, showed a negative correlation with clay (r = –0.51, P ≤ 0.05) and a positive correlation with ACCE (r = 0.63, P ≤ 0.01). Langmuir K (Kl) showed a positive correlation with clay (r = 0.52, P ≤ 0.05) and a negative relationship with pH (r = –0.58, P ≤ 0.05) and ACCE (r = –0.65, P ≤ 0.01). Sorption of Cd showed a positive correlation (r ≥ 0.54, P ≤ 0.05) and its desorption a high negative correlation (r ≤ –0.61, P ≤ 0.05), with ACCE. It can be concluded that the ACCE is the important soil property controlling the sorption and retention of Cd in the studied soils.
Publisher: Wiley
Date: 22-01-2021
Publisher: Wiley
Date: 18-12-2020
Publisher: Informa UK Limited
Date: 24-10-2017
Publisher: Walter de Gruyter GmbH
Date: 28-03-2019
Abstract: Complete descriptions of the particle-size distribution (PSD) curve should provide more information about various soil properties as opposed to only the textural composition (sand, silt and clay (SSC) fractions). We evaluated the performance of 19 models describing PSD data of soils using a range of efficiency criteria. While different criteria produced different rankings of the models, six of the 19 models consistently performed the best. Mean errors of the six models were found to depend on the particle diameter, with larger error percentages occurring in the smaller size range. Neither SSC nor the geometric mean diameter and its standard deviation correlated significantly with the saturated hydraulic conductivity ( K fs ) however, the parameters of several PSD models showed significant correlation with K fs . Porosity, mean weight diameter of the aggregates, and bulk density also showed significant correlations with PSD model parameters. Results of this study are promising for developing more accurate pedotransfer functions.
Publisher: Springer Science and Business Media LLC
Date: 10-05-2012
No related grants have been discovered for Habib Khodaverdiloo.