Spectral wheat growth profile in Punjab using IRS WiFS data |
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| Authors: | D R Rajak M P Oza N Bhagiaand V K Dadhwal |
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| Institution: | (1) Department of Soil and Water Engineering, College of Agricultural Engineering and Technology, Junagadh Agricultural University, Junagadh, 362 001, Gujarat, India;(2) Agricultural and Food Engineering Department, Indian Institute of Technology, Kharagpur, 721 302, WB, India |
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| Abstract: | A functional form of crop spectral profile suggested by Badhwar was applied to district-wise wheat Normalised Difference Vegetation
Index (NDVI) values relatively normalised by Pseudo-Invariant Feature (urban and built-up) NDVI values, derived from Wide
Field Sensor (WiFS) onboard Indian Remote Sensing Satellites (IRS) for 17 dates during 1999–2000 rabi season. The goodness
of overall profile fitting and the three basic parameters i.e., crop emergence date (To), and crop specific parameters (a and P) was found to be statistically significant. While a corresponds to profile progressive
growth rate, β corresponds to profile decay rate. A comparison with earlier studies in Punjab using NOAA-AVHRR indicated improvement
in relation between peak NDVI and wheat yield. The estimated time of spectral emergence and profile-derived peak NDVI follow
the observed behaviour of shortened crop pre-anthesis period with delayed sowing. |
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