science seems to have inched closer to answering a question that has nagged agriculturists for almost 100 years
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/marvel-unearthed
[2] http://admin.indiaenvironmentportal.org.in/category/author/t-v-jayan
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/down-earth
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/soil-resources
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/chemical-fertilisers