Soil Moisture Content
Soil Moisture Content - Related Videos
06:16
Determination of Moisture Content in Soil
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2023
Source: Laboratories of Dr. Ian Pepper and Dr. Charles Gerba - The University of Arizona Demonstrating Author: Bradley Schmitz Soils normally contain a finite amount of water, which can be expressed as the “soil moisture content.” This moisture exists within the pore spaces in between soil aggregates (inter-aggregate pore space) and within soil aggregates (intra-aggregate pore space) (Figure 1). Normally this pore space is occupied by air and/or water. If all the pores are occupied by air, the...
08:20
In Situ Soil Moisture Sensors in Undisturbed Soils
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Cited by 7 •
2022
The determination of soil water content is a critical mission requirement for many state and federal agencies. This protocol synthesizes multi-agency efforts to measure soil water content using buried in situ sensors.
01:10
Moisture Content and Bulking of Aggregate
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2024
The moisture content of aggregates is a crucial factor in construction, particularly in concrete mixing, as it influences the total water required in the mix. Moisture content represents the water coated on the exterior surface of the aggregate existing in a saturated and surface-dry condition. The total water content of a moist aggregate is the sum of its moisture content and water absorption. When aggregates are exposed to rain or sit in stockpiles, they absorb moisture, which must be...
09:16
Methods of Soil Resampling to Monitor Changes in the Chemical Concentrations of Forest Soils
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Cited by 19 •
2016
Repeated soil sampling has recently been shown to be an effective way to monitor forest soil change over years and decades. To support its use, a protocol is presented that synthesizes the latest information on soil resampling methods to aid in the design and implementation of successful soil monitoring programs.
07:51
Measurements of Soil Carbon by Neutron-Gamma Analysis in Static and Scanning Modes
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Cited by 8 •
2017
Here, we present the protocol for in situ measurement of soil carbon using the neutron-gamma technique for single point measurements (static mode) or field averages (scanning mode). We also describe system construction and elaborate data treatment procedures.
FAQs
Changes in soil moisture content reflect the balance among infiltration, drainage, evaporation, and plant transpiration. Infiltration adds water to soil, while drainage removes water downward; evaporation and transpiration transfer water away from the soil system. Because these processes redistribute water differently, measurements can vary over time without a direct addition of water.
Gravimetric and volumetric values describe the same soil-water condition using different reference bases. The gravimetric form relates water to dry soil mass, whereas the volumetric form relates water to total soil volume. This distinction matters when comparing samples or interpreting environmental datasets, because conclusions depend on whether water availability is examined relative to soil mass or the soil volume occupied in place.
Moisture conditions help determine whether water remains available within the soil, moves downward, or contributes to runoff. They also affect nutrient transport because moving water can redistribute nutrients through soil and watershed systems. Consequently, soil moisture measurements help connect local water conditions with predictions of runoff patterns and nutrient movement in environmental studies.
Monitoring soil moisture content links water redistribution to ecosystem function rather than treating soil water as static. Changes associated with infiltration, drainage, evaporation, and plant transpiration help indicate how much water remains available for vegetation and how much may proceed toward groundwater recharge. This makes the variable useful for interpreting interactions among plants, soil, and subsurface water.
Measurements provide evidence about whether soil water conditions support plant growth or indicate developing water stress. In irrigation planning, repeated values can guide decisions about when water availability is becoming insufficient. For drought assessment, the same observations reveal unusually low soil moisture and help characterize water conditions alongside broader environmental monitoring.
In watershed studies, soil moisture observations help evaluate how water is partitioned among infiltration, drainage, runoff, and groundwater recharge. In climate studies, they provide a changing environmental variable for examining water availability and ecosystem response. Including these measurements improves interpretation of hydrological behavior across landscapes and supports analyses of how water moves through land systems.
They supply observations that help models represent changing water availability and redistribution caused by infiltration, drainage, evaporation, and plant transpiration. Better representation can improve predictions of runoff, groundwater recharge, and nutrient transport. Measurements also provide a basis for evaluating whether model behavior matches environmental conditions observed in soils and watersheds.
Comparing soil moisture measurements across changing land-use conditions can show whether water availability and redistribution patterns are shifting. Such changes may alter infiltration, drainage, evaporation, transpiration, runoff, or groundwater recharge, with consequences for ecosystem function and nutrient transport. Monitoring therefore provides an observational link between landscape modification and hydrological response.