EFFECT OF MAGNETIC TREATMENT ON IRRIGATION
WATER QUALITY, SOIL PROPERTIES AND GROWTH OF
SUNFLOWER CROP
Thesis submitted to the
University of Agricultural Sciences, Dharwad
In partial fulfillment of the requirements for the
Degree of
Master of Science (Agriculture)
In
Soil Science
By
ASHWINI H. GUDIGAR
PDF LINK TO THESIS
REVIEW OF LITERATURE
Magnetized water is water passed through a magnetic field. Many physico-chemical changes
are reported to take place in the water when treated magnetically, including changes in viscosity,
boiling point, magnetic susceptibility, electrical conductivity and surface tension. Magnetized water
is reported to increase crop yield, induce seed germination and benefit the health of livestock and it is
found to be effective for preventing and removing scale deposits in pipes and water containing
structures and also increase the levels of CO2 and H+ in soils comparable to the addition of fertilizers.
Magnetized water has been used as an effective means for soil desalinization. When applied to salty
soil, magnetic field breaks down the salt crystals and helps in faster leaching of salts. The literature
pertaining to the effect of magnetic treatment on irrigation water quality, soil properties and crop is
reviewed in this chapter under the following headings
2.1 Effect of magnetic treatment on irrigation water quality
2.2 Effect of magnetized water on soil properties
2.3 Effect of magnetized water on germination and growth
2.4 Effect of magnetized water on yield and quality parameters
2.5 Effect of magnetized water on physiological properties
ABSTRACT
Experiments were conducted to study the effect of magnetic treatment on irrigation water
quality, soil properties, leaching efficiency of salts and growth of sunflower crop during 2011- 2012
at College of Agriculture, UAS, Dharwad. Four separate experiments were conducted to achieve the
objectives. Irrigation waters with different salinity levels of i.e., 2, 4, 6, 8, 12 and 16 dS m-1 were
obtained by equilibrating natural saline soil with good water in the ratio of 1:3 and used in the studies
along with GW (0.6 dS m-1). For magnetic treatment, the waters were passed though the magnetic
device as required for each study.
The one-time magnetic treatment of irrigation water significantly decreased electrical
conductivity but the effect on pH was variable. With multiple magnetic treatments, the difference
between treated and untreated became increasingly narrow. The calcium, magnesium, sodium and
sodium adsorption ratio also followed the same trend. The magnetic treatment also had mollifying
effect on residual sodium carbonate of water. In general, the decrease was of higher magnitude at
lower level of water salinity. Intermittent irrigation with magnetized water significantly decreased soil
pH but increased soil salinity. Soil exchangeable calcium, sodium and exchangeable sodium
percentage decreased due to irrigation with magnetized water. Soil water soluble calcium, magnesium
and sodium decreased due to magnetized water irrigation. The magnetic treatment significantly
decreased the dispersible clay content over non-magnetized water use.
Leaching a saline soil with magnetized water removed more salts from the soil compared to leaching
with non-magnetized water. Soils leached with magnetized water had significantly higher leachate salinity
and lower soil salinity compared to leaching with non-magnetized water.
The magnetic treatment significantly increased germination percentage, plant height and dry matter yield in sunflower over non-magnetized water use. The magnetic treatment increased the K/Na ratio and improved its salt-tolerance.