article on stubble burning for class 7th
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STUBBLE BURNING
INTRODUCTION
Stubble burning is now recognized as one of the significant activities that degrades ambient air quality as it is one of the major sources of aerosol and gaseous pollution (Andreae and Merlet, 2001). A study has reported that humans are responsible for about 90% of biomass burning with a negligible percentage of natural fires contributing to the total amount of vegetation burned (Mittal et al., 2009). It has increased over the past decade due to excessive use of combine harvester that leaves stalks that are about one-foot tall and cannot be tilled back into the soil. The burning is considered as the easiest and economical option for management and removal of the stubble. Due to a lack of awareness or non-availability of suitable technologies, it is generally practiced in many countries..
.2. Role of remote sensing in estimation of stubble burn area
Remote sensing is defined as the collection of useful information from a distance. It is particularly important in collecting and processing data of the inaccessible areas. Over the last few years, the remote sensing field has seen enormous development in spectral and spatial resolution, which paved the way for better detection of individual field practices. Remote sensing with Geographical Information Syste (GIS) can be used as an effective method in determining the stubble burn area at regional and global levels (Escuin et al., 2008; Murphy et al., 2008; Pradhan, 2001). The burned area mapping aims at detecting and delineating the scars left by fires by the usage of their spectral signature. Over the past ten years, many studies.
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