Co-Relation of MNDVI Values, Yield and Soil Texture: Integrating RS, GIS and Land Based Observation

Abstract

The spectral reflectance of crops is strongly related to canopy parameters, which are related to the final yield. These are influenced by factors such as soil characteristics, cultural practices and other biotic factors i.e. spectral data is an integration of all factors affecting crop growth. MNDVI (Modified NDVI) value is directly related to spectral reflectance of crops. Most studies have revealed that there is a correlation between MNDVI and yield, therefore, MNDVI can be used to estimate yield before harvesting. Soil texture plays an important role for yield estimation. By considering this relationship between yield and MNDVI, one relationship is tried to be developed here between soil texture and MNDVI values for wheat crop. The primary objective is to establish the relationship between remotely sensed MNDVI measurement and soil texture of wheat crop. The study was conducted in Haridwar district in Uttarakhand state in India. The district covers an area of approximately 2360 km². Satellite images used for this study include an IRS-P6, LISS-III IRS images taken on March 2009, 2010, 2011, 2012, 2013 and March 2014. MNDVI images has been generated and then different models for different years have been developed to get only wheat crop rather than other crops, for above mentioned years, based on MNDVI values, in 3 categories range has been divided; Low cropping intensity, Medium cropping intensity, and High cropping intensity. Soil map have been digitized and total 38 classes based on National Bureau of Soil Survey and Land Use Planning have been associated with that area in soil map. To find the relationship between soil texture type and MNDVI range, both the layers have been overlaid, and findings have been made accordingly.