Agricultural practices, which add heavy metals to the soil, include indiscriminate use of fertilizers through chemical farming and plant protection chemicals. However organic farming is a production system to produce chemical free nutritious food of high quality.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/effect-source-nutrition-heavy-metals-plants-and-soils
[2] http://admin.indiaenvironmentportal.org.in/category/author/s-s-walia
[3] http://admin.indiaenvironmentportal.org.in/category/author/d-s-kler
[4] http://admin.indiaenvironmentportal.org.in/category/author/m-p-s-khurana
[5] http://admin.indiaenvironmentportal.org.in/category/journal/indian-journal-ecology
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/soil-capability
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agriculture
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/organic-farming
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/chemical-fertilisers
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/heavy-metals
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pesticide-use