scholarly journals Five models of hysteretic water-retention capacity and their comparison for sandy soil

2018 ◽  
Vol 193 ◽  
pp. 02036 ◽  
Author(s):  
Vitaly Terleev ◽  
Wilfried Mirschel ◽  
Aleksandr Nikonorov ◽  
Roman Ginevsky ◽  
Viktor Lazarev ◽  
...  
Keyword(s):  
Mathematical Models ◽  
Hysteresis Loop ◽  
Sandy Soil ◽  
Water Retention ◽  
Plant Protection ◽  
Plant Protection Products ◽  
Practical Significance ◽  
Water Retention Capacity ◽  
Retention Capacity ◽  
Using Data

A description of five mathematical models of the water-retention capacity of soil is given, taking into account the hysteresis phenomena. A computational experiment was carried out with these models using data on sandy soil. The experiment consisted of: (i) tuning of the models (parameter identification) by the method of dot-approximation of experimental data on the main drying and wetting branches of the hysteresis loop using an optimizing algorithm; (ii) the predictive calculation of the scanning branches of the hysteresis loop; (iii) a comparison of the errors in tuning results and the predictive calculation using the Williams-Kloot criteria. The commensurate and sufficiently low errors in the adjustment of the models have been achieved. The differences in the calculation of the scanning hysteresis branches are revealed. The practical significance of the mathematical models presented is to ensure the calculation of precision irrigation rates. The application of such rates in irrigation farming will help to prevent excess moisture from flowing beyond the root layer of the soil under the influence of gravity and, thus, to minimize the losses (unproductive consumption) of irrigation water, fertilizers, meliorants and plant protection products, and also reduce the risk of groundwater contamination with agrochemicals and eutrophication of water bodies.

scholarly journals Comparative analysis for three models of hysteretic water retention capacity using data on silty soil

2020 ◽  
Vol 1614 ◽  
pp. 012080
Author(s):  
V A Lazarev ◽  
R S Ginevsky ◽  
A G Topaj ◽  
A O Nikonorov ◽  
I A Dunaieva ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Water Retention ◽  
Water Retention Capacity ◽  
Retention Capacity ◽  
Silty Soil ◽  
Using Data

scholarly journals Modeling the hydrophysical soil properties and comparative analysis for three systems of functions

2020 ◽  
Vol 175 ◽  
pp. 09016
Author(s):  
Vitaly Terleev ◽  
Roman Ginevsky ◽  
Viktor Lazarev ◽  
Aleksandr Nikonorov ◽  
Alexander Topaj ◽  
...  
Keyword(s):  
Porous Medium ◽  
Soil Moisture ◽  
Comparative Analysis ◽  
Hydraulic Conductivity ◽  
Soil Properties ◽  
Water Retention ◽  
Field Measurements ◽  
Practical Significance ◽  
Water Retention Capacity ◽  
Retention Capacity

A functional description of the hydrophysical properties of the soil as a capillary-porous medium is presented. The described functions of water retention capacity and hydraulic conductivity of the soil have common parameters, which are interpreted within the framework of physical and statistical concepts. The practical significance of the proposed functions lies in the fact that the volume of labor-intensive field measurements necessary, for example, for modeling the dynamics of soil moisture, is significantly reduced. To identify the parameters of these functions, it is sufficient to use data only on the water retention capacity of the soil. The parameters identified in this way can be used to predict the ratio of the hydraulic conductivity of the soil to the moisture filtration coefficient. The presented system of the hydrophysical functions of the soil is compared with world analogues using literature data on soils of different texture.

scholarly journals Improving water retention capacity of an aeolian sandy soil with feldspathic sandstone

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Lu Zhang ◽  
Jichang Han
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Sandy Soil ◽  
Water Retention ◽  
Water Retention Capacity ◽  
Retention Capacity ◽  
Mu Us Sandy Land ◽  
Soil Water Characteristic Curves ◽  
High Suction ◽  
Feldspathic Sandstone

Abstract The Mu Us sandy land in China’s Shaanxi Province faces a critical water shortage, with its aeolian sandy soil endangering the regional eco-environment. Here we investigated the effects of feldspathic sandstone on water retention in an aeolian sandy soil from the Mu Us sandy land. Feldspathic sandstone and aeolian sandy soil samples were mixed at different mass ratios of 0:1 (control), 1:5 (T1), 1:2 (T2), and 1:1 (T3). Soil-water characteristic curves were determined over low- to medium-suction (1–1000 kPa) and high-suction (1000–140 000 kPa) ranges, by centrifuge and water vapor equilibrium methods, respectively. Results showed that the addition of feldspathic sandstone modified the loose structure of the aeolian sandy soil mainly consisting of sand grains. The van Genuchten model described well the soil-water characteristic curves of all four experimental soils (R2-values > 0.97). Soil water content by treatment was ranked as T2 > T3 > T1 > control at the same low matric suction (1–5 kPa), but this shifted to T2 > T1 > T3 > control at the same medium- to high-suction (5–140 000 kPa). T2 soil had the largest saturated water content, with a relatively high water supply capacity. This soil (T2) also had the largest field capacity, total available water content, and permanent wilting coefficient, which were respectively 17.82%, 11.64%, and 23.11% higher than those of the control (P-values < 0.05). In conclusion, adding the feldspathic sandstone in an appropriate proportion (e.g., 33%) can considerably improve the water retention capacity of aeolian sandy soil in the study area.

scholarly journals Bacterial polyextremotolerant bioemulsifiers from arid soils improve water retention capacity and humidity uptake in sandy soil

2018 ◽  
Vol 17 (1) ◽  
Author(s):  
Noura Raddadi ◽  
Lucia Giacomucci ◽  
Ramona Marasco ◽  
Daniele Daffonchio ◽  
Ameur Cherif ◽  
...  
Keyword(s):  
Sandy Soil ◽  
Water Retention ◽  
Water Retention Capacity ◽  
Arid Soils ◽  
Retention Capacity

scholarly journals Synthesis and Characterization of Slow-Release Fertilizer Hydrogel Based on Hydroxy Propyl Methyl Cellulose, Polyvinyl Alcohol, Glycerol and Blended Paper

Gels ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 262
Author(s):  
Semiu A. Kareem ◽  
Idayatu Dere ◽  
Daniel T. Gungula ◽  
Fartisincha Peingurta Andrew ◽  
Abdullahi M. Saddiq ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Sandy Soil ◽  
Water Retention ◽  
Slow Release ◽  
Tap Water ◽  
Methyl Cellulose ◽  
Water Retention Capacity ◽  
Retention Capacity ◽  
Slow Release Fertilizer ◽  
Swelling Capacity

In this study, biodegradable slow-release fertilizer (SRF) hydrogels were synthesized from hydroxyl propyl methyl cellulose (HPMC), polyvinyl alcohol (PVA), glycerol and urea (SRF1) and HPMC, PVA, glycerol, urea and blended paper (SRF2). The fertilizer hydrogels were characterized by SEM, XRD and FTIR. The swelling capacity of the hydrogels in both distilled and tap water as well as their water retention capacity in sandy soil were evaluated. The hydrogels had good swelling capacity with maximum swelling ratio of 17.2 g/g and 15.6 g/g for SRF1 and SRF2 in distilled, and 14.4 g/g and 15.2 g/g in tap water, respectively. The water retention capacity of the hydrogels in sandy soil exhibited higher water retention when compared with soil without the (SRFs). The soil with the hydrogels was found to have higher water retention than the soil without the hydrogels. The slow-release profile of the hydrogels was also evaluated. The result suggested that the prepared fertilizer hydrogels has a good controlled release capacity. The blended paper component in SRF2 was observed to aid effective release of urea, with about 87.01% release in soil at 44 days compared to the pure urea which was about 97% release within 4 days. The addition of blended paper as a second layer matrix was found to help improve the release properties of the fertilizer. The swelling kinetic of the hydrogel followed Schott’s second order model. The release kinetics of urea in water was best described by Kormeye Peppas, suggesting urea release to be by diffusion via the pores and channels of the SRF, which can be controlled by changing the swelling of the SRF. However, the release mechanism in soil is best described by first order kinetic model, suggesting that the release rate in soil is depended on concentration and probably on diffusion rate via the pores and channels of the SRF.

scholarly journals Biochar Amendment Enhances Water Retention in a Tropical Sandy Soil

Agriculture ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 62 ◽  
Author(s):  
Martha Lustosa Carvalho ◽  
Moacir Tuzzin de Moraes ◽  
Carlos Eduardo P. Cerri ◽  
Maurício Roberto Cherubin
Keyword(s):  
Sandy Soil ◽  
Water Retention ◽  
Agricultural Soils ◽  
Soil Bulk Density ◽  
Micropore Volume ◽  
Water Retention Capacity ◽  
Soil Water Retention ◽  
Retention Capacity ◽  
Available Water Content ◽  
Biochar Amendment

The use of biochar, which is the solid product of biomass pyrolysis, in agricultural soils, has been shown as a strategic solution for building soil carbon stocks and mitigating greenhouse gas emissions. However, biochar amendment might also benefit other key soil processes and services, such as those that are related to water retention, particularly in sandy soils. Here, we conducted an experiment to investigate the potential of biochar to enhance pore size distribution and water retention properties in a tropical sandy soil. Three biochar rates were incorporated (equivalent to 6.25, 12.5, and 25 Mg ha−1) into plastic pots containing a sandy Oxisol sampled from a sugarcane field in Brazil. Undisturbed samples of the mixture were collected at two evaluation times (50 and 150 days) and used to determine water retention curves and other soil physical properties. The results showed that biochar amendment decreased soil bulk density and increased water retention capacity, micropore volume, and available water content. Higher soil water retention in amended soil is associated with the inherent characteristics of biochar (e.g., internal porosity) and potential improvements in soil structure. Microporosity and water retention were enhanced with intermediate biochar rate (12.5 Mg ha−1), instead of the highest rate (25 Mg ha−1) tested. Further studies are needed to validate these results under field conditions.

scholarly journals Water regime Poaceae family species in the drought conditions

2019 ◽  
Vol 190 (11) ◽  
pp. 2-8
Author(s):  
М. Власенко ◽  
M. Vlasenko ◽  
К. Трубакова ◽  
K. Trubakova
Keyword(s):  
Environmental Conditions ◽  
Water Retention ◽  
Water Regime ◽  
Bromus Inermis ◽  
Agropyron Cristatum ◽  
Practical Significance ◽  
Water Retention Capacity ◽  
Science Center ◽  
Retention Capacity ◽  
Poaceae Family

Abstract. The purpose of the research is to consider the patterns of water regime of plants in dry conditions, depending on changes in environmental conditions and plant physiology. The objectives of the research included: identifying abilities of Poaceae family herbs (Festuca pratensis, Bromus inermis L., Agropyron cristatum L., Agropyrum Gaertn.) introduced into crops on the vegetation sites of the lysimetric complex of the Federal Science Center of Agroecology of the Russian Academy of Sciences (Volgograd) to sustainability in adverse environmental conditions. Scientific novelty and practical significance. The study contributes to the solution of issues of effective prediction of the productivity of forage grasses, since water-regime patterns of growth and development of vegetation must be taken into account when developing optimal growing methods. Methods. The determination of the water-holding capacity of herbs was carried out according to the Arlanda method and is based on taking into account the water loss by plants. The intensity of transpiration was determined by the method of fast weighing the selected sheet of L. А. Ivanov. A description of the mechanism of water retention by plants with an increase in drought is given. Results. As a result, it has been established that perennial grasses of the family Poaceae have a high potential for resistance to soil and atmospheric drought. The largest water retention capacity is: Bromus inermis L. (87.8%), Agropyrum Gaertn. (87.1 %) and Agropyron cristatum L. (87.0 %). The ability to change water retention capacity can be viewed not only as an adaptive function in changing environmental conditions, but also as a dynamic process that characterizes the natural course of the metabolism of cells and tissues during ontogenesis. Indicators of transpiration intensity in species of the Poaceae family usually reach a maximum up to high midday temperatures. The highest rates were found in Bromus inermis L. and Agropyrum Gaertn., for which in the morning they reached 1.41–1.42 g/dm2-h.

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