Parameters Electrical Conductivity Research Articles

Impact of electro-osmotic, activation energy and chemical reaction on Sisko fluid over Darcy–Forchheimer porous stretching cylinder

This study provides numerical solution for two-dimensional electro-osmotically motivated electro-magneto-hydrodynamic Sisko fluid through an elongating porous cylinder. The electro-osmotic, activation energy with chemical reaction are also interpreted for this flow model. The numerical equations that govern this flow problem are renewed into dimensionless form by applying appropriate transformations exploiting Runge–Kutta–Fehlberg fifth order through shooting technique method. The after-effects are illustrated as graphs for the concerned physical parameters and their impact on convection and conduction is also studied. The velocity rises for electro-osmotic parameter whereas drops for magnetic and porous parameter. The temperature shows an increasing profile for the curvature, electric and thermal conductivity parameter while decreases for Prandtl number. The concentration of nanoparticles in the fluid boosts for activation energy but deflates for curvature parameter. The present findings appear to be in good accord when compared to earlier published studies. Numerous opportunities and applications are presented by applying electro-osmotic forces to non-Newtonian fluid flow, especially in the fields of nanotechnology, electro-kinetics and micro-fluids. The current study can be applied to design effective electro-magnetic devices, particularly in certain thermal transport characteristic regime. The main findings demonstrate the great utility of electro-osmosis in micro-fluidic devices, chemical analysis, soil analysis and cement slurries for managing flow and heat transmission.

A multidimensional AI-trained correction to the 1D approximate model for Airborne TDEM sensing

The computational resources required to solve the full 3D inversion of time-domain electromagnetic data are immense. To overcome the time-consuming 3D simulations, we construct a surrogate model, more precisely, a data-driven statistical model to replace the 3D simulations. It is trained on 3D data and predicts the approximate output much faster. We construct a surrogate model that predicts the discrepancy between a 1D subsurface model and a deviation of the 1D assumption. The latter response is fastly computable with a semi-analytical 1D forward model. We exemplify the approach on a two-layered case. The results are encouraging even with few training samples. Given the computational cost related to the 3D simulations, there are limitations in the number of training samples that can be generated. In addition, certain applications require a wide range of parameters to be sampled, such as the electrical conductivity parameters in a saltwater intrusion case. The challenge of this work is achieving the best possible accuracy with only a few thousand samples. We propose to view the performance in terms of learning gain, representing the gain from the surrogate model whilst still acknowledging a residual discrepancy. Our works open new avenues for effectively simulating 3D TDEM data.

Multi-scale ground penetrating radar full waveform inversion with hybrid Tikhonov and total-variation regularization for different geometric structure

Abstract Full waveform inversion (FWI) is a high-resolution technique to estimate the parameters of dielectric permittivity (ϵ) and electrical conductivity (σ) and identify the structure of the subsurface for Ground Penetrating Radar (GPR) application. However, permittivity and conductivity parameters can be coupled in bi-parameter GPR inversion. This coupling effect leads to the crosstalk in the FWI result. To solve this problem, we propose a novel approach to use the multi-scale FWI with the hybrid regularization method, which combines Tikhonov and total-variation (TV) regularizers that simultaneously invert the ϵ and the σ parameters, which improve the inversion accuracy and reduce the crosstalk effect. The multi-scale strategy uses the Wiener filtering to process the GPR data in different frequency ranges. Then, the low frequencies signal updates the bottom part and subsequently increases the frequencies to invert for the shallow areas. The Tikhonov regularization stabilizes the reconstruction of the smoothly varying background part. In contrast, Total Variation (TV) regularization can recover the large contrasts associated with the LNAPL model. The new Tikhonov-TV (TT) regularization can mitigate the crosstalk caused by the parameter coupling effect. Numerical tests with typical GPR models demonstrate that the proposed multi-scale TT-FWI strategy can effectively eliminate the crosstalk and improve the reconstruction accuracy when the model parameters have a different structure.

Phenol-formaldehyde resin enriched with graphene nanoplatelets as an electroconductive adhesive for wood composites

The study demonstrates that phenol-formaldehyde (PF) resin, commonly used for lignocellulosic composites, can become electroconductive when modified with graphene nanoplatelets (GNPs) while still serving as an effective adhesive for particleboard production. The PF resins enriched with various amounts of GNPs were tested for viscosity, gel time, and thermal stability, followed by electrical conductivity measurements for GNP-enriched resins applied to several lignocellulosic surfaces of varying wettability. These tests showed that the optimum weight percentages of GNP at which the resins maintain both the electrical conductivity and process parameters, enabling the formation of particleboard, amount to 18.5%. Consequently, a prototype of electroconductive particleboard was created and evaluated for bending strength (EN 310: 1993), modulus of elasticity (EN 310: 1993), tensile strength (EN 319: 1993), thickness swelling (EN 317: 1993), water adsorption (PN-76/D-04234) and formaldehyde emission (EN ISO 12460–5:2015). Impressively, the panels achieved a conductivity of 320 Ω m, indicating their potential use as resistive heaters and other applications in the Internet of Things (IoT) area. Simultaneously, the GNP-enriched panels showed formaldehyde emission well below the threshold set by the standards and exhibited mechanical properties that in most cases met the criteria for use in furniture and interior design.

Improving the optical, thermal, mechanical, electrical properties and antibacterial activity of PVA-chitosan by biosynthesized Ag nanoparticles: Eco-friendly nanocomposites for food packaging applications

In this study, nanocomposite films were produced by blending polyvinyl alcohol (PVA) and chitosan (Cs) polymers with 70 % PVA and 30 % Cs, incorporating silver nanoparticles (Ag NPs) via a solution-casting method. The research aims to investigate the impact of the biosynthesized Ag NPs by Chenopodium murale leaf extract on optical, morphological, mechanical, thermal, electrical, and antibacterial properties. XRD analysis showed a decrease in crystallinity degree with Ag NPs addition. TEM revealed Ag NPs in cubic and spherical shapes with an average size of 23.4 nm. SEM and AFM indicated surface morphology changes. FT-IR spectra showed interaction between Ag ions and the blend. The energy gap decreased with increasing Ag NPs concentration. TGA exhibited enhanced thermal stability. Mechanical properties improved significantly. AC electrical conductivity and dielectric parameters were studied. Antibacterial activity against Gram-positive and Gram-negative bacteria was observed. Overall, PVA/Cs-Ag NPs films show promise for food packaging and optoelectronic applications.

Assessment of Groundwater Quality in Attaragoda Grama Niladhari Division in Galle, Sri Lanka

Insufficient quality can make water unfit for a range of human purposes. As a result, water is becoming scarcer globally as population growth continues. Water quality assessment is essential for effective water resource management. The present research fills the gap in scientific knowledge and information regarding the groundwater quality status in Attaragoda Grama Niladhari (GN) Division in Galle, Sri Lanka. Randomly selected 33 groundwater samples were collected from 142/A Attaragoda GN division monthly from November 2021 to March 2022. Together, 13 selected general water quality parameters, including temperature, pH, total dissolved solids, electrical conductivity, salinity, dissolved oxygen, biological oxygen demand, total nitrate, total phosphate, total alkalinity, total hardness, ammonia, and fluoride, were measured once a month during the study period using standard methodologies. Additionally, four metals, including Iron, Calcium, Magnesium, and Sodium, were analysed for the randomly selected 15 locations during the study period. Statistical analysis was done using Minitab 17 and MS Excel 13. Weighted Arithmetic Water Quality Index (WQI) was calculated using electrical conductivity, TDS, pH, hardness, phosphate, alkalinity, and nitrate parameters in Attaragoda GND. Results indicated that, except for Fe, none of the tested parameters exceeded the maximum permissible levels for drinking water throughout the study. Accordingly, all locations were categorized as good for drinking purposes. For a more precise evaluation of water quality, the WQI can be improved by future research focusing on heavy metal and microbial contaminants.
 
 Keywords: Groundwater, Water quality, Weighted arithmetic water quality index

Hydrochemical Assessment of Groundwater Quality for Drinking in Tamil Nadu's Tirupur District

Due to the industrialization in Tirupur district of Tamil Nadu in South India, quality of groundwater resources is getting affected. The study aims to assert the chemical composition of groundwater in this area. 15 samples were collected randomly and their latitude and longitude were taken and mapped using GIS. The samples were processed and analysed for various physiochemical parameters such as pH, electrical conductivity, total hardness, dissolved solids and hydro chemical parameter such as calcium, magnesium, chloride, sulphite, chromium, iron. Multivariate statistical analysis provides fundamental insights for finding the chemical composition. Here quality assessment results were compared with the water quality standards prescribed by Bureau of Indian standards (Indian standard specification of drinking water IS: 10500.

Interactions between mangrove soil, water, and microbes in degraded, natural, and restored tropical coastline ecosystems

ABSTRACT The interactions among soil, water, and microbes are unique and fundamental in mangrove forests. We examined and compared the physicochemical parameters of soil (pH, Organic Carbon (OC), Electrical Conductivity (EC), N, P, K, Mg, Ca, S, Fe, Zn, Cu, and Mn) and water (pH, temperature, Total Dissolved Solids (TDS), EC) as well as microbial diversity and abundance in nine natural, degraded, and restored mangrove ecosystems along Guyana’s coastline. Sampling was done using a randomized block design for one year in two seasons. Significant differences, correlations (p < 0.05, R > 0.75) and regressions in water and soil parameters were documented for the natural ecosystems and restored ecosystems in both seasons. Additionally, microbial abundance was greater in the restored ecosystems, while seasonal variations in diversity were seen in the degraded and restored ecosystems. Our study lends some credence to the idea that ecosystem type and seasonality can influence soil, water, and microbial interactions, which can ultimately affect mangrove biodiversity.

Determination Water Level by Electrical Resistivity and Comparing Results with Drilled Well in Al-Naharwan, Baghdad

The 2D electrical resistivity imaging survey was done in Al-Naharawan area within Baghdad city for unknown subsurface to give a best location for digging a new well. Electrical resistivity imaging survey is implemented for along four lines that are 120 m long and all have 1m electrode separation. Measurements done with wenner-Schlumberger array and interpreted data by using RES2DINV program. The results for drilling the well at electrodes 62 and 63 in line 1 showed exactly corresponds to the lithological order of the well Fadhel Abass. Electrical resistivity imaging results showed high and low resistivity values, although they both contain clay, which corresponds to variances in water content. One Groundwater sample was taken from the new well and analyzed chemically to determine the concentration of the major ions. water analysis shows high TDS, electrical conductivity, and most parameters affecting human life out of permissible limits, so it is not suitable for human drinking. SAR =21.695, RSC=-474, which indicates the risk from sodium is improbable and lies within permissible ranges. PI% within Class II, meaning the water quality is good for irrigation. The findings indicated that the 2D imaging method is an effective and powerful enough tool for identifying new well with water table and detecting subsurface.

Features of electrical conductivity at high temperatures of complex titanomagnetite ores from the Gusevogorsky deposit

Relevance is determined by the search and selection of the most information-intensive characteristics and physical properties of complex titanomagnetite ores in connection with the need for scientifically based criteria for their detection, quality assessment during selective mining and selection of optimal enrichment technology. Research methodology. To study the electrical properties, samples in the shape of a cube with an edge of 0.02 m were used. The measurements were carried out in an open system at atmospheric pressure. Electrical resistance was measured with a two-electrode setup every 10 degrees in the temperature range 20–800 ºC. Heating rate 0.066 deg/s. The measuring device is an E6-13 teraohmmeter with a dynamic range from 10 to 1014 Ohms and a relative measurement error from ±2.5% to 4% at the end of the range. Results. A collection of samples of complex titanomagnetite ores from the Gusevogorsky deposit (Northern quarry) was studied using physical, mineralogical and petrographic methods. Functional connections have been established between the electrical parameters of high-temperature electrical conductivity (Eₒ – activation energy, lg Rₒ – the so-called electrical resistance coefficient), the value and nature of the electrical resistance lg R in the temperature range 20−800 °C of the studied samples of complex ores with their structural and textural features and mineral composition. Based on structural and textural features, mineral composition and electrical parameters, the studied samples are clearly divided into three groups. Conclusions. The presented results, in combination with other physicochemical parameters, can be used as a reliable indicator of rapid assessment of the material being studied. Significant differences in the electrical parameters of titanomagnetite ores provide additional information about their quality. In combination with other methods, we hope for the possibility of using these parameters in the selective extraction of ores that require different enrichment regimes.

Sustainability and Quality: Analysis of the Benefits of Bee Pollination in Coffee

Theoretical benchmark: Coffee farming has a productive chain of economic, cultural, historical and social relevance for Brazil. Assisted pollination carried out by bees becomes an alternative in increasing productivity and coffee quality, in addition to contributing to biodiversity. In this context, this work was developed with the objective of analyzing the benefits of pollination by bees in coffee production, verifying the effects on quality by comparing physicochemical parameters of the grains. Method: Coffee samples were collected from two areas from pollinated and non-pollinated coffee trees, grouped together forming a sample for each treatment and subsequently dried in a suspended terrace until reaching 12% humidity. For physicochemical characterization of the grains, analyzes of Soluble solids, thousand grains mass, Titratable acidity, pH, Electrical conductivity, and Coloring were performed. Results and conclusion: In the pollinated area, the values of Soluble solids were higher with 31.49°Brix in raw grains and 23.20°Brix in cherry grains and in the Mass of a thousand grains with 113.35g in the raw grain. In the electrical conductivity, titratable acidity and pH parameters, lower values were observed in the pollinated area in the raw grains. For Coloring, better results were observed in coordinates L: 30.98; a: 0.44; b:11.39 in coffee from an area of assisted pollination. The obtained results were significant in pollinated area in the parameters Soluble solids in raw beans and cherry and in Mass of a thousand beans and Color (coordinate L) only in raw beans, when compared to non-pollinated coffee. Regarding titratable Acidity and Electrical conductivity in pollinated area, better analytical results were observed, which are more representative in terms of grain quality. Research implications: Generate scientific data and a reflection on the importance of pollination in sustainable production and its implications not only for agriculture and society, but for the entire balance of ecosystems. Originality and value: Research carried out at Fazenda Nove de Julho located in the municipality of Altinópolis, SP to verify the contribution of stingless bees to coffee production and the valorization of these pollinators as a decisive factor in increasing the productivity and quality of Brazilian agricultural production.

INTERAKCJA POMIĘDZY INTENSYWNOŚCIĄ ŚWIATŁA A STRESEM SUSZY I ICH WPŁYW NA WZROST SIEWEK PSZENICY

In this paper, wheat seedlings were exposed to different levels of photon flux density (PFD) and drought stress. Seedlings of the wheat cv. Goplana were cultivated in controlled conditions in a miniphytotrone and exposed to three different photosynthetic photon flux densities (400, 800, and 1200 μmol⋅m−2⋅s−1) and drought stress (a water potential of −0.6 MPa). The Hoagland’s solution-treat- ed seedlings served as a control. The fresh and dry matter of the overground parts and roots, rela- tive chlorophyll concentration, electrical conductivity and chlorophyll fluorescence parameters were measured. Drought stress decreased the biomass of wheat seedlings, cv. Goplana. Higher intensities of photosynthetically active irradiation stimulated biomass growth both under control conditions and under drought stress. Drought and higher PFD intensity resulted in a decrease in chlorophyll content. Only the highest light intensity, together with drought stress, negatively affected the structure of cell membranes, increasing their permeability. Both of the applied stress factors did not cause significant changes in the values of the determined parameters of chlorophyll fluorescence in the leaves of wheat seedlings. These results suggest that the increase in light intensity has a mobilising effect on the plant, stimulating the development of biomass both under control conditions and under drought stress. No changes in the values of chlorophyll fluorescence parameters under the influence of different light intensities and drought stress may indicate that there were no significant disturbances in the course of the light phase of photosynthesis in the leaves of the tested seedlings.

Determination of Groundwater Quality Index in Rural Area: The Case of Bartın City

The aim of the study is to determine the change of groundwater quality in rural areas in rainy and dry periods with respect to physicochemical parameters. pH, total dissolved solids, electrical conductivity, nitrate, sulfate, phosphate hardness, chloride, turbidity and color parameters were investigated. The water quality index (WQI) is widely used for detecting and evaluating water pollution. Water quality index was determined to be 35 and 32 in rainy and dry periods for drinking water. It was also calculated to be 37 for the rainy and dry periods according to the irrigation water limit values. As a result, since WQI

Effect of replacing B2O3 with Dy2O3 on the structural, physical, and radiation shielding properties of sodium boroaluminate glass

AbstractIn this work, some transparent aluminum sodium borate-based glasses containing Dy2O3 have been prepared using the melt quenching method. The incorporation of Dy3+ ions in the glass network leads to increase and decrease the density and molar volume, respectively. The structural properties are investigated by XRD and FTIR spectroscopy. It is revealed that addition of Dy2O3 causes a conversion of boron coordination from BO4 to BO3, which indicates the increase in the number of non-bridging oxygen. Therefore, the optical band gap is found to decrease as the Dy3+ ions content increases. The temperature dependences of dielectric constant and AC conductivity are studied at different frequencies. The electric conductivity and dielectric parameters decrease with increasing Dy3+ content due to the decrease in Na+ ions mobility due to the blocking effect of Dy3+ cations in the glass network. The shielding factors have been evaluated for the prepared glasses with the help of Phy-X program. The maximum linear attenuation coefficient (LAC) is found at 0.284 MeV and varied between 0.125 and 0.140 cm−1. The results revealed that the incorporation of Dy2O3 into the glasses has a substantial effect on the Zeff.. The value of the Zeff for the D1 sample, which does not include any Dy2O3, stays relatively the same, ranging around 7.51. We found that the rate of reduction in Zeff was significantly high when the energy of the photons is smaller than 0.826 MeV. From the Zeff data, we found that the addition of Dy2O3 to the glasses improves both their capacity to absorb and their capability to scatter ionizing radiation.

Identifikasi Jenis Mineral Magnetik Berdasarkan Uji XRF pada Sedimen Permukaan Sungai Bone di Daerah Pertambangan di DesaTulabolo Timur, Suwawa, Kabupaten Gorontalo

This study aims to determine the Types of Magnetic Minerals in Bone River Sediments in the Mining Area of Tulabolo Village. The XRF test was used to identify Magnetic Mineral elements in Bone River Sediments, and electrical conductivity (EC), pH, and temperature parameters for in situ measurements of Bone River water samples and measures of mineral types was carried out on prepared sediment samples. The results showed that direct measurements on water samples showed that the values of EC, pH, and temperature were (1,620-1,900) µS/cm, (5-7), and (25.0-25.9)oC, respectively. While the results of measurements using XRF elements that have the most significant percentage are elements (Si), especially at the S10 point of 58.84% diamagnetic minerals, elements (Fe), especially at the S7 point of 22.80%, element (Al) at the S10 point of 8, 11%, elements (Ti) at point S1 1.84% which are ferromagnetic minerals. Elements (Ca) at end S2 of (2.67%), elements (K) at point S1 of 1.50% paramagnetic minerals.

Electrokinetic remediation of estuarine sediments using a large reactor: spatial variation of physicochemical, mineral, and chemical properties.

The treatment and beneficial use of polluted or contaminated environmental matrices have become major issues, especially as the world strives toward a zero-waste policy. In this regard, dredged sediments need to be treated before they can be used in an environmentally safe and sustainable manner. Therefore, this work aims to treat estuarine sediments and, more importantly, use physicochemical, mineral, organic, and chemical information to understand the reactions that occur upon treatment. Dredged estuarine sediments were collected from Tancarville (Seine River estuary, France) and subjected to electrokinetic (EK) remediation using a 128-L laboratory-scale reactor. The sediments were treated 8h per day for 21days. The electric (voltage and current) and physicochemical (pH and electric conductivity) parameters were monitored during treatment. Sediments were collected from various sections in the reactor at the end of the experiment (lengthwise, widthwise, and depthwise). The spatial variation was investigated in terms of organic, mineral, and metal contents. Statistical analyses proved that the variation occurred only in the lengthwise direction. Furthermore, three main phases described the treatment, which were mainly linked to carbonate dissolution and pH variation. The results also showed that the trace elements Ni and Zn were reduced by 21% and 19%, respectively, without a direct link to pH, while Ca and Mg were only redistributed. The buffering capacity of the anodic sediment was reduced due to carbonate dissolution. The treated sediments showed reduced contents in trace metals without affecting major elements that can be useful in agriculture (i.e., Ca and Mg).

Development of an IoT-Based SCADA System for Monitoring of Plant Leaf Temperature and Air and Soil Parameters

Plant leaf temperature and its environmental parameters provide valuable information on plant growth. This paper presents the development of a plant monitoring system using an IoT-based SCADA (Supervisory Control and Data Acquisition). The developed SCADA system monitors the leaf temperature and the air parameters of temperature and humidity, as well as the soil parameters of temperature, moisture, pH, electrical conductivity, nitrogen, phosphorous, and potassium. A novel method is proposed for measuring the leaf temperature using a low-cost 8 × 8 array thermal camera. The sensor systems in the field are developed to wirelessly communicate with the Hawell IoT Cloud HMI via a Modbus TCP protocol. To visualize the thermal image on the HMI dashboard, a novel approach is proposed wherein the data are transferred using the Modbus TCP protocol. The HMI is connected to a cloud server and can be accessed by the users using the web browser or mobile application on a smartphone. The experimental results show that the proposed hardware, software, and communication protocol are reliable for real-time and continuous plant monitoring. Further, the evaluation of sensor data shows that the data from the thermal camera and air parameters sensor can be independently interpreted. However, the data from the soil sensor should be interpreted in consideration of the other parameters.

Determination of Some Quality Parameters of Filtered Flower Honey Obtained from Bingöl and Its Districts

Some quality parameters were determined for the filtered flower honeys harvested in 2021 from the center and 7 districts of Bingöl province. The moisture, free acidity, electrical conductivity, pH and color parameters of the supplied filtered flower honey samples were investigated. The average values of 22 honey samples collected from the center and districts of Bingöl were determined as; humidity 15.43±0.06, free acidity 14.584±0.427 meq kg-1, electrical conductivity 0.228±0.001 (mS cm-1), pH 3.48±0.015 and color parameters L*, a*, b* values 58.404±0.275, 3.906±0.033, 38.552, respectively. According to these results, it was observed that the investigated filtered flower honeys were within the limit values specified in the Turkish Food Codex Honey Communiqué.

Agricultural Drainage Water Assessment for Possible Reuse: A Case Study from Pandamatenga Commercial Arable Farms in Botswana

This study set out to assess the quality of water in the drainage channel located in the northern plain of the Pandamatenga Commercial Arable farms in Botswana for possible agricultural reuse. This was achieved by analysing the physical, microbiological and chemical parameters of sampled Agricultural Drainage Water along the drainage channel. The results obtained from the Agricultural Drainage Water quality analysis were used in an Irrigation Water Quality Index model to assess the possibility of reusing the water. The Irrigation Water Quality Index results from the study revealed that the values computed from the five parameters of Sodium Adsorption Ratio, Electrical Conductivity, Sodium, Chloride and Hydrogen carbonate, ninety five percent of the samples fell within the “severe restriction” category, five percent of the samples fell under the “moderate restriction” and no samples belonged to the “no restriction” category. The low levels of Electrical Conductivity and Sodium Adsorption Ratio detected in the water samples during the study period indicated a mineral imbalance, hence making the Agricultural Drainage Water unsuitable for direct reuse. Therefore, using this Agricultural Drainage Water will require mixing it in proper ratios with groundwater to improve its quality for reusability during irrigation. If the Drainage Water is reused, this will have potential to increase the water for irrigation in semi-arid Botswana.

HUMIDITY RETENTION IN SOIL WITH Elaeis guineensis Jacq. AT DIFFERENT AGES OF DEVELOPMENT

The amount of water retained by soil depends on its physical and chemical properties, as well as the type of cover or crop present. It is important to understand the effects of oil palm (Elaeis guineensis Jacq.) plantations on water requirements. Therefore, the objective of this study was to determine soil humidity parameters in oil palm plantations at different ages of development in Tabasco, Mexico. The experiment was conducted using a completely randomized design with three replications. Four treatments were evaluated: 5-, 11-, and 25-year-old oil palm, and pasture as a control treatment. As response variables, parameters of bulk density (Da), texture, field capacity (CC), permanent wilting point (PMP), electrical conductivity (CE), saturation point (PS), and soil humidity parameters including irrigation sheet (Lr), sheet in the infiltration rate test (Lrinf), basic infiltration (Ib), accumulated sheet (Z), soil humidity retention curves (CRH), and soil humidity stress (EHS) were determined. Ib and Z values were determined in the surface layer; Lr, Lrinf, and CRH at three depths (0–30, 30–60, and 60–90 cm). The results indicate that the treatments presented significant differences (p ≤ 0.05) in all the variables evaluated; and the parameters of field capacity, permanent wilting point, initial and final humidity in the infiltration rate test, affected the humidity content in the Lr, Lrinf, CRH and EHS. It is concluded that oil palm age modifies soil humidity retention parameters and influences water requirements.