Sandy soil moisture content measurement method based on heated fiber Bragg grating

Soil is a composition of Sand, Silt and Clay. From three phase concept, it is clear that the soil consists of solids, water and air. The ratio of weight of water to weight of solids for a given soil mass is known as water content of soil. In other words, the water content (w) also known as natural water content or natural moisture content. Water content is used in a wide range of scientific and technical areas, and is expressed as a ratio, which can range from zero to the value of the soil porosity at saturation. Traditionally, the water content is measured by pycnometer or oven dry methods which would generally take 24 hours to determine the water content soil. As the time is important these days, several smart advances are occurred in determining the moisture content through Internet of Things (IoT). In this project, the water content of soil is measured through IoT sensors and traditional methods. Present work involves in which different soil samples are taken along the road construction site and classifying them with the help of sieve analysis, Atterberg limits and plasticity chart and moisture content measurement using internet of things (IoT) and traditional methods are compared. Also, find a possible correlation developed between the soil moisture content by traditional methods and through IoT.

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Sensitivity of PR2 Capacitance Soil Moisture Meter for Irrigation Scheduling

Indian Journal of Production and Thermal Engineering - regular ◽

10.35940/ijpte.b2007.081321 ◽

2021 ◽

Vol 1 (3) ◽

pp. 1-5

Author(s):

Olotu Y.* ◽

◽

Omoakhalen A.I. ◽

Ososomi A.S. ◽

Gbalaja Mayowa ◽

...

Keyword(s):

Soil Moisture ◽

Moisture Content ◽

Soil Moisture Content ◽

Organic Soil ◽

Integrated Water Resources Management ◽

Irrigation Scheduling ◽

Computer Algorithms ◽

Resources Management ◽

Moisture Content Measurement ◽

Complex Computer

Accurate soil moisture content measurement is essential for designing a robust irrigation scheduling and integrated water resources management (I.W.R.M.). Capacitance-based sensors have widely been used to monitor soil moisture at different measuring depths coupled with continuous and instantaneous outputs. This study's objective was to evaluate the PR2 capacitance moisture meter's performance on mineral and organic soil water content. The outputs of PR2 in m3 /m3 and vol.% were compared with gravimetrically measured soil moisture. The R.M.S.E. measurement at Site A at the first and second replicates increased from 0.49% to 0.67%. In contrast, the r2 value of 0.99 was obtained for the two replications when comparing the soil moisture content observed from gravimetric measurement and the automated outputs from the PR2 Probe soil monitor. The R.M.S.E. values were 0.48%, and 1.32% were estimated for the first and second replications at Site B. The result indicates that the PR2 Profile Probe could be a reliable alternative to other time-consuming, complex computer algorithms for accurate point measurement of soil moisture.

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Effects of Biochar and Synthetic Polymer on the Hydro-Physical Properties of Sandy Soils

Sustainability ◽

10.3390/su10124642 ◽

2018 ◽

Vol 10 (12) ◽

pp. 4642 ◽

Cited By ~ 6

Author(s):

Arafat Alkhasha ◽

Abdulrasoul Al-Omran ◽

Anwar Aly

Keyword(s):

Soil Moisture ◽

Moisture Content ◽

Physical Properties ◽

Sandy Soil ◽

Soil Moisture Content ◽

Column Experiment ◽

Field Capacity ◽

Infiltration Rate ◽

Arid Environments ◽

Percentage Decrease

Synthetic polymers, such as polyacrylamide (PAM), and biochar are generally used as soil amendments to improve soil properties. This paper explores a laboratory column experiment conducted to investigate the effects of biochar (pyrolysis at 400–450 °C) and polymers, with different application rates, on the hydro-physical properties of sandy soil. The experiment evaluated four rates each of biochar (0.0% (C), 2% (B1), 4% (B2), 6% (B3) and 8% (B4)) and polymers (0.0% (C), 0.2% (P1), 0.4% (P2), 0.6% (P3), and 0.8%(P4)), as well as a mixture of them. The infiltration rate decreased significantly when a mixture of biochar and polymers was adopted. B1 showed a decrease of 32.73% while a mixture of 8% (B4) and (0.8%) P4 exhibited a decrease of 57.31%. The polymers increased the infiltration rate at low concentrations (P1 and P2) and reduced it at high concentrations (P3 and P4). The cumulative evaporation decreased significantly for most treatments. B1 recorded the highest decrease in cumulative evaporation with a percentage decrease of 31.9%. The highest decrease in hydraulic conductivity (Ks) was for B1. However, the mixture of B4 and P4 resulted in the highest increase in soil moisture content at field capacity compared to the control and other treatments. P4 and the mixture of B2 and P2 showed significant (p < 0.05) increases in the percentage of stable aggregate (SA) in fraction size (0.25–0.125 mm). Although the mixture of B4 and P4 had the highest increase in soil moisture content, this study recommends using the B1 treatment on sandy soil in arid environments due to its strong hydro-physical properties and affordability.

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Sensitivity of PR2 Capacitance Soil Moisture Meter for Irrigation Scheduling

Indian Journal of Production and Thermal Engineering - regular ◽

10.54105/ijpte.b2007.081321 ◽

2021 ◽

pp. 1-5

Author(s):

Olotu Y. ◽

◽

Omoakhalen A.I. ◽

Ososomi A.S. ◽

Gbalaja Mayowa ◽

...

Keyword(s):

Soil Moisture ◽

Moisture Content ◽

Soil Moisture Content ◽

Organic Soil ◽

Integrated Water Resources Management ◽

Irrigation Scheduling ◽

Computer Algorithms ◽

Resources Management ◽

Moisture Content Measurement ◽

Complex Computer

Accurate soil moisture content measurement is essential for designing a robust irrigation scheduling and integrated water resources management (I.W.R.M.). Capacitance-based sensors have widely been used to monitor soil moisture at different measuring depths coupled with continuous and instantaneous outputs. This study’s objective was to evaluate the PR2 capacitance moisture meter’s performance on mineral and organic soil water content. The outputs of PR2 in m3/m3 and vol.% were compared with gravimetrically measured soil moisture. The R.M.S.E. measurement at Site A at the first and second replicates increased from 0.49% to 0.67%. In contrast, the r2 value of 0.99 was obtained for the two replications when comparing the soil moisture content observed from gravimetric measurement and the automated outputs from the PR2 Probe soil monitor. The R.M.S.E. values were 0.48%, and 1.32% were estimated for the first and second replications at Site B. The result indicates that the PR2 Profile Probe could be a reliable alternative to other time-consuming, complex computer algorithms for accurate point measurement of soil moisture.

Download Full-text