New Delhi, Sept. 29 -- The harvest season has begun in northwest India, and so has stubble burning and the unending search for a permanent solution to a problem that leads to severe air pollution in the region, especially in Delhi and the National Capital Region, every winter. According to a report in this paper on Monday, stubble burning may continue this year because central subsidies on straw management machinery are not attractive enough for small farmers to switch to them. Last week, Delhi chief minister Arvind Kejriwal wrote to Union environment minister Prakash Javadekar, saying that the Centre must look into the Indian Agricultural Research Institute's (IARI) suggestion of converting stubble to manure using a chemical. Last year, an analysis of satellite data from the NASA Goddard Space Flight Center suggested no decline in the number of crop stubble fires in 2018 compared to 2017, despite the new policy for in-situ management of crop residue....