A simple and inexpensive plastic-mounted colour chart is being advocated for efficient nitrogen management in rice by scientists at the International Rice Research Institute in the Philippines. "The
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/colour-chart-manage-nitorgen-rice
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agriculture