Relationship between AWiFS derived Spectral Vegetation Indices with Simulated Wheat Yield Attributes in Sirsa district of Haryana
Other literature type
Ramana, K. V.
Rao, S. V. C. K.
Sesha Sai, M. V. R.
(issn: 2194-9034, eissn: 2194-9034)
Satellite remote sensing can provide information on plant status for large regions with high temporal resolution and proved as a
potential tool for decision support. It allows accounting for spatial and temporal variations of state and driving variables, influencing
crop growth and development, without extensive ground surveys. The crop phenological development and condition can be
monitored through multi-temporal reflectance profiles or multi-temporal vegetation indices (VI), such as the Normalized Difference
Vegetation Index (NDVI) and Normalized Difference Water Index (NDWI). At the same time, Process based dynamic crop growth
simulation models are useful tools for estimating crop growth condition and yield on large spatial domains if their parameters and
initial conditions are known for each point. Therefore, combined approaches integrating remote sensing and dynamic crop growth
models for regional yield prediction have been developed in several studies. In these models the vegetation state variables, e.g.,
development phase, dry mass, LAI are linked to driving variables, e.g., weather condition, nutrient availability and management
practices. Output of these models is usually final yield or accumulated biomass. The model outputs are a summary containing an
overview of the main development events, water and nitrogen variables, yield and yield components. In the present work, IRS P6
AWiFS derived vegetation indices like NDVI and NDWI are computed to study the growth profile of wheat crop in Sirsa district of
Haryana along with crop growth simulation model DSSAT-CERES from 2008–09 to 2012–13.several iteration of wheat crop
simulation are carried out with four sowing dates and four soil types varying with respect to the fertility parameters to represent the
average simulation environment of Sirsa district in Haryana state of India. Four years time series NDVI and NDWI are used to
establish the correlation between the spectral vegetation indices and simulated wheat yield attributes at critical growth stages of
wheat. This work is a basic investigation towards assimilation of remote sensing derived state variables in to the crop growth model.