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PERFORMANCE EVALUATION OF SOIL MOISTURE SENSOR IN RED SOIL FOR EFFECTIVE WATER MANAGEMENT
P.R. PATIL, K. NAGARAJAN, S.V. KOTTISWARAN, K. ARULMOZHISELVAN

Published in: International Journal of Agriculture Sciences
Volume- 9, Issue-39, pp.4608-4611, Aug 2017
DPI :-> 16.10077.IJAS.2017.V9I39.46084611.1886



Abstract
A study was conducted to develop the sensor and evaluate the soil moisture by using soil moisture sensors and to establish the relationships between soil moisture content and electrical resistance value. Study involved the fabrication of the soil moisture probes, automation network and laboratory testing of automation system. The soil moisture sensor and automation system used for experiment were developed at Department of Soil and Water Engineering, Tamil Nadu Agricultural University, Coimbatore. System is tested and calibrated for automatic irrigation scheduling. Laboratory test programs were conducted for the performance of the soil moisture sensor in salt solution and different soils, and to develop the calibration curve. It was observed that a significant logarithmic relation between Electrical conductivity and resistive value of sensor-1, sensor-2, sensor-3 and sensor-4 with an R2 value of 0.95, 0.96, 0.96 and 0.96 respectively and with mean values of electrical resistance found R2 value of 0.964. Because of the sensors were tested for wide range of electrical conductivities ranges 0.01 dSm-1 to 8.12 dSm-1. Soil moisture sensor was evaluated with respect to the moisture content of the red soil and from the calibration curve it was predicted that the electrical resistance 264 Ohms to 386 Ohms with an average electrical resistance of 334.5 Ohms for maintaining the field capacity of red soil and at the range of 412 Ohms to 618 Ohms with an average electrical resistance of 525.8 Ohms at permanent wilting point. From figure, it was observed that average moisture content 37.99, 36.21, 35.31, 33.64, 31.79, 30.17, 28.39, 26.30, 24.91, 23.29, 21.90 and 19.99 per cent recorded at an average duration of 0, 3, 6, 18, 24, 27, 45, 48, 51, 69, 72 and 75 hours respectively.

Key-Words / Index Term
Soil moisture sensor, Red soil, Field capacity, Resistivity, Electrical conductivity

How to cite this article
P.R. PATIL, K. NAGARAJAN, S.V. KOTTISWARAN, K. ARULMOZHISELVAN , “PERFORMANCE EVALUATION OF SOIL MOISTURE SENSOR IN RED SOIL FOR EFFECTIVE WATER MANAGEMENT”, International Journal of Agriculture Sciences, 9, Issue-39, pp.4608-4611, Aug 2017. DPI:16.10077.IJAS.V9.I39.1886