Journal of FARM SCIENCES, Vol 31, No 3 (2018)

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Studies on spectral reflectance characteristics of salt affected soils and sugarcane crop of Ghataprabha Left Bank Canal Command area of Karnataka

MALLIKARJUNA LINGAPPA, V. B. KULIGOD, M. V. MANJUNATHA

Abstract


Spectral reflectance of salt affected soils were obtained using hand held spectrophotosensor and from IRS P6 LISS-IV MX satellite imagery. Spectral reflectance of salt affected soils of Ghataprabha Left Bank Canal (GLBC) command area revealed that higher spectral reflectance at higher salinity level in all spectral bands of LISS-IV and spectrophotosensor. The highest mean reflectance values (DNs) of 141, 160 and 197 were recorded at higher salinity level > 16 dS m-1 in surface soils in band 2, 3 and 4 of LISS-IV sensor. The lowest mean reflectance value (DNs) of 119, 128 and 153 were recorded at lower salinity level (< 4 dS m-1) of surface soils in band 2, 3 and 4, respectively of LISS-IV sensor. Spectral reflectance of sugarcane crop increased with increase in surface soil salinity level for band 1 and band 3 and decreased with increase in surface soil salinity for band 2 and band 4.The highest mean spectral reflectance value of 49.8, 70.3 (at higher salinity level > 16 dS m-1), 64.5 and 162.4 (at lower salinity level 4-8 and <4 dS m-1) were recorded in band 1, 3, 2 and 4, respectively for surface depth. In case of LISS-IV data sets of sugarcane, mean spectral reflectance value remained the highest (140) at higher salinity level of > 16 dS m-1) in band 3. However, spectral reflectance values were 126 and 212 at lower salinity level                         of < 4 and 4-8 dS m-1 in band 2 and 4, respectively of surface soil. 

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