RE SPONSE OF RA TIO VEG E TA TION IN DI CES OF RICE CROP FOR NI TRO GEN AND TILLAGE RESPONSE

Abstract

Field experiments were conducted to study the influence of nitrogenous fertilizer on the rice crop for puddle and unpuddled tillage conditions using remote sensing technique at the research farm of Indian Agricultural Research Institute, New Delhi during Kharif 1999 and Kharif 2001. Band ratio calculated with the help of spectral radiance observation of the crop canopy which were collected with the Portable Spectroradiometer, scanned from 330 nm to 1100 nm of electromagnetic spectrum range at 5nm band-width. Band ratio was calculated for the both tillage practices, puddle and unpuddled situation at different growth stages for different fertilizer treatment. Fertilized plots were observed to have a higher value of BR than controlled ones throughout the crop growth period, both in puddled and unpuddled treatments.The higher values of band ratio were observed in puddled rice compare to the unpuddled rice irrespective of growth stages and fertilizer application levels.