Vol. 12, Issue 11 (2023)

Author(s):
SK Thakur, Rishi Pathak, Ajay Ahirwar and RK Nema

Abstract:
Every natural and synthetic object on the earth surface and near surface reflects and emits EMR (Electromagnetic Radiation) over a range of wavelengths in its own characteristics way according to its chemical composition and physical state. The brightness or reflectance of vegetation varies across the electromagnetic spectrum. Actively growing plants show a strong contrast between strong absorption in the red and high reflectance in the near-infrared regions of the spectrum. This property can be used to demarcate the area under different crops in a synoptic manner. Remote sensing satellite gathers data on reflectance in different wavelength bands. It has to be analyzed in light of ground information and response of a particular crop in different wavelength bands. This study was conducted to evaluate the spectral response of rabi crops namely as mustard and wheat. For this study experimental crop plots were considered. Weekly observations were recorded with hand held spectro radiometer at different stages of crop growth. The observations were taken from 21^st Jan to 26^th March 2010 till the harvest of crops. The results obtained show that in all the treatments incident energy is measured 12.5 to 191.7 W/cm²/Sr-micron. The soil is reflecting from 40 to 70 percent of it in all the four bands. It behaves in similar way in all the bands. The average reflectance of all crops was obtained 22 to 99 percent. The average reflectance from mustard and wheat increases with crop growth till vegetative growth and reduced to minimum at the time of maturity because of composition of crop and structure of leaf due to lowering of moisture content. The spectral response of different crops is helpful to demarcate and monitor the crops and for further planning.