 Look at the burning fields. These are the common images around the villages of Punjab. And this is occurring during the autumn season. Now what is this? This is called stubble burning. The residue crop stubbles are burnt trying to quickly make way for the sowing of new crops for the next ravi seasons. What happens because of this? It causes pollution which results in excessive smog over the Delhi in the winter seasons. And the burning of paddy straw increases the soil temperature causing soil infertility. So what is done to control this? The government took new initiative like Pusa rice decomposer. This decomposes the stubble making it into manure in 20 days. And then government is trying to make farmers use short duration rice varieties like PR 121, PR 126 to stop them from going for stubble burning for the re-cropping. And to know more about stubble burning click the link in the description.