Bhopal, Dec. 26 -- Union home minister and minister of cooperation Amit Shah on Thursday urged farmers to adopt natural farming methods, saying "the earth is our mother, and we should not cover it with concrete." Addressing "Krishak Sammelan" (farmers' congregation) in Madhya Pradesh's Rewa, Shah said, "BP, sugar, and other diseases are a result of the mixed fertilisers and other chemicals in the grains. If we want to get rid of these diseases, we have to move towards natural farming. As many as four million farmers in the country have already joined natural farming." "Natural farming has a very high value all over the world. The world has already accepted that natural grains are essential for better health. More than 400 laboratories acros...