Determination of the humidity of soil by monitoring the conductivity with indium tin oxide glass electrodes

Fabregat-Santiago, Francisco; Ferriols, Noemı´ S.; Garcia-Belmonte, Germa`; Bisquert, Juan
April 2002
Applied Physics Letters;4/15/2002, Vol. 80 Issue 15, p2785
Academic Journal
A number of approaches to the determination of water content of soil use a dielectric permittivity measurement, which is accurate but involves expensive and complex devices. We explore the use of indium tin oxide, a wide-band gap semiconductor with high conductivity, long-term stability, and low cost, to build a cheap sensor of low humidity values for automatic irrigation systems. The electrical resistance determined by an ac impedance method discounts the effects of electrode contacts and provides a reliable measure of the water content, even when the chemical conditions of water vary widely. The reason for this is that, at low values of humidity, the conductivity is controlled by a surface conduction mechanism that is largely insensitive to the electrolytic properties of added water. The results appear promising for applications that require the detection of very low levels of humidity in soil. © 2002 American Institute of Physics.


Related Articles

  • Analysis of PM10, PM2.5, and PM2.5-10 Concentrations in Santiago, Chile, from 1989 to 2001. Koutrakis, Petros; Sax, Sonja N.; Sarnat, Jeremy A.; Coull, Brent; Demokritou, Phil; Oyola, Pedro; Garcia, Javier; Gramsch, Ernesto // Journal of the Air & Waste Management Association (Air & Waste M;Mar2005, Vol. 55 Issue 3, p342 

    Daily particle samples were collected in Santiago, Chile,at four urban locations from January 1, 1989, through December 31, 2001. Both fine PM with da <2.5 �m (PM2.5) and coarse PM with 2.5 < da <10 �m (PM2.5-10) were collected using dichotomous samplers. The inhalable particle...

  • Mesoscale Simulation of Rapid Soil Drying and Its Implications for Predicting Daytime Temperature. Santanello Jr., Joseph A.; Carlson, Toby N. // Journal of Hydrometeorology;Feb2001, Vol. 2 Issue 1, p71 

    Focuses on a study which examined rapid soil drying and its implications for predicting daytime temperature and humidity. Results of soil water content simulation; Fractional vegetation cover; Conclusions.

  • Atmospheric Controls on Soil Moisture�Boundary Layer Interactions. Part I: Framework Development. Findell, Kirsten L.; Eltahir, Elfatih A. B. // Journal of Hydrometeorology;Jun2003, Vol. 4 Issue 3, p552 

    This paper investigates the influence of soil moisture on the development and triggering of convection in different early-morning atmospheric conditions. A one-dimensional model of the atmospheric boundary layer (BL) is initialized with atmospheric sounding data from Illinois and with the soil...

  • Leaf strategies and soil N across a regional humidity gradient in Patagonia. Bertiller, Mónica B.; Mazzarino, María J.; Carrera, Analía L.; Diehl, Paula; Satti, Patricia; Gobbi, Miriam; Sain, Claudia L.; Bustamante, Mercedes // Oecologia;Jun2006, Vol. 148 Issue 4, p612 

    We analyzed leaf traits related to carbon-fixation, nutrient conservation strategies, and decomposability and their relationships with potential N-mineralization and microbial N in soil in 19 species of 5 dominant life forms growing in 40 sites across a regional humidity gradient in northern...

  • Influence of soil cover on moisture content and weed suppression under system of rice intensification (SRI). Mohammed, U.; Aimrun, W.; Amin, M.; Khalina, A.; Zubairu, U. // Paddy & Water Environment;Jan2016, Vol. 14 Issue 1, p159 

    System of rice intensification (SRI) makes the yield of rice to significantly increase in addition to water productivity, which in turn will have a positive effect to the farmers as well as the country at large. However, weeds growth is one of the main constraints of SRI due to wider planting...

  • SOIL HETEROGENEITY IN LANDSCAPES OF THE MOIST TROPICS AND THE CHANGEABLE-MOIST TROPICS: SOIL HYDROLOGY. Lareshin, V. G.; Slobodyanyuk, K. V. // Theoretical & Applied Problems of Agro-industry;2013, Vol. 15 Issue 2, p56 

    The paper is devoted to the phenomenon of existence in soils of catenas in landscapes of the moist tropics humidity thresholds of two types: a) the «negative» thresholds, which are indicators of the existence of lateral subsurface flow of moisture from the soil of high hypsometric levels,...

  • Sensitivity of Polygonum aviculare Seeds to Light as Affected by Soil Moisture Conditions. Diego Batlla // Annals of Botany;May2007, Vol. 99 Issue 5, p915 

    Background and AimsIt has been hypothesized that soil moisture conditions could affect the dormancy status of buried weed seeds, and, consequently, their sensitivity to light stimuli. In this study, an investigation is made of the effect of different soil moisture conditions during cold-induced...

  • Variation characteristics of soil moisture in apple orchards of Luochuan County, Shaanxi Province of Northwest China. WANG Yan-ping; HAN Ming-yu; ZHANG Lin-sen; DANG Yong-jian; QU Jun-tao // Yingyong Shengtai Xuebao;Mar2012, Vol. 23 Issue 3, p731 

    To have an overall understanding on the soil moisture characteristics in the apple orchards of Luochuan County can not only provide theoretical basis for selecting apple orchard sites, choosing the best root-stock combination, and improving the soil water management, but also has reference...

  • Transformation of different exogenous arsenic forms in soil under aerobic condition. He Qiu-hong; Zeng Xi-bai; Li Lian-fang; Bai Ling-yu // Yingyong Shengtai Xuebao;Dec2010, Vol. 21 Issue 12, p3212 

    An incubation test was conducted to study the transformation of exogenous dimethylarsenic acid (DMA), monomethylarsenic acid (MMA), and arsenate [As(V)] in soil under the condition of 35% of water-holding capacity. After added into soil, the concentrations of test arsenic forms all showed a...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics