Study on leaf nutrient status and spectral characteristics of Bt cotton in Jewargi Taluka, Kalaburagi district

Abstract

A study was undertaken in Bt cotton growing soils of Jewargi taluka of Kalaburagi district in 2017-18 to study the leaf nutrient status and spectral characteristics of Bt cotton the results revealed that the leaf petiole nitrogen concentration of Bt cotton was low to high (1.27 to 4.15%), phosphorus was low to sufficient (0.10 to 0.41%) and potassium was sufficient (0.30 to 4.03%) in all samples. The leaf petiole calcium (0.29 to 0.97%) and magnesium (0.12 and 0.96%) concentration was found to be sufficient to high and leaf petiole sulphur concentration (0.14 and 0.49%) was found to be sufficient. The leaf petiole micronutrients (Fe, Mn, Cu and Zn,) were present well within the sufficient ranges. The NDVI and SPAD meter values of Bt cotton crop canopy were in the range of 0.59 to 0.94 and 27.70 to 51.30, respectively.