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University of Agricultural Sciences, Dharwad (2007)

Estimation and monitoring of soil moisture by radar remote sensing technique and identification of soil productivity constraints in bhanapur microwatershed

Srikanth K.S.

Titre : Estimation and monitoring of soil moisture by radar remote sensing technique and identification of soil productivity constraints in bhanapur microwatershed

Auteur : Srikanth K.S.

Université de soutenance : University of Agricultural Sciences, Dharwad

Grade : Master of Science in Soil Science and Agricultural Chemistry 2007

Résumé
A systematic investigation was conducted on estimation of soil moisture status by RADAR microwave remote sensing and assessment of soil productivity constraints of the Bhanapur microwatershed in Koppal district under the agro-climatic zone 3 of Karnataka. An extensive field sampling was conducted during 2005 and 2006 to estimate and monitor the soil moisture status at surface (0-5 cm) and subsurface (5-10 cm) soil. ENVISAT-1 ASAR data for 2005 and field observations were used for estimation of soil moisture and backscatter values have been extracted from ENVISAT-1 images. Correlation study showed an encouraging positive correlation of microwave backscatter value (HH polarization) with the soil moisture at both surface and sub-surface soils. However, the relation was good with red soils and improved for 0-10 cm soil depth. During 2006, soil moisture was low on all the days of observation. Higher soil moisture content was recorded in black soils than in red soils. The microwatershed consists of both red and black soils in association. Texture of Black soils was clay loam to clayey and that of red soils was sandy to sandy loam. The maximum water holding capacity, FC and porosity were higher in black soils than in red soils. The bulk density of red soils was higher than black soils. The soils were slightly acidic to alkaline in nature with low to medium organic carbon content. The CaCO3 and Fe2O3 content of the soils ranged from 3.0 to 8.5 and 1.0 to 7.9 per cent, respectively. Crop cutting experiments showed that yield of crops was low especially during 2006 compared to 2005. The mapping of soil moisture and available nutrient status by GIS technique indicated that N, P, S, Zn and soil moisture are major constraints in both black and red soils of Bhanapur microwatershed. Soil moisture was more critical during 2006

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