CROP ACREAGE AND YIELD ESTIMATION STUDIES IN CHILLI USING REMOTE SENSING
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Date
2003
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University of Agricultural Sciences, Dharwad
Abstract
Chilli crop acreage and yield estimation in Kundgol and Hubli taluks of Dharwad district, Karnataka was carried out by selecting 62 ground truth sites in both the taluks, using IRS ID LISS III imagery of 14th November 2002. The acreage estimation was done by running the supervised classification with maximum likelihood algorithm and yield estimation by developing yield models using the relationship between crop cutting experiments yield data and NDVI and LAI of chilli crop. The spectral reflectance of chilli crop was low in blue region (16% - 19%), slightly higher in green region (62-87 per cent), minimum in red region (38% - 58%) followed by steep rise in near infrared region (58% - 99%). The analysis of soil samples from the selected ground truth sites revealed that the soils are neutral to alkaline in reaction with normal electrical conductivity, low to medium organic carbon content, low to medium available nitrogen, medium to high available phosphorus and high available potassium content. The estimated acreage under chilli crop in Kundgol taluk was 29,159 ha and 14,224 ha in Hubli taluk. The acreage estimates using remote sensing data when compared with acreage estimates reported by Department of Horticulture, showed a relative deviation of-18.56 per cent and -7.27 per cent in Kundgol and Hubli taluks, respectively. The yield models developed using NDVI and LAI showed significant coefficient of determination R2 = 0.85 and R2 = 0.87. These models can explain 85 per cent and 87 per cent of variability in yield estimation in Kundgol and Hubli taluks, respectively. The average yield of chilli crop was estimated to be 471 kg per ha in Kundgol taluk and 419 kg per ha in Hubli taluk. The total production of dry chillies in Kundgol taluk was 13,734 tonnes and 5,960 tonnes in Hubli taluk.
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