Water (either from the sky or the irrigation canal) is often a key factor in determining crop yields, squeezing more crop out of the same drop will be central to one of the biggest challenges of this
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/water-more-crop-drop
[2] http://admin.indiaenvironmentportal.org.in/category/author/emma-marris
[3] http://admin.indiaenvironmentportal.org.in/category/journal/nature
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agriculture
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agricultural-research
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/food-supply
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/gm-crops
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-management
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-conservation
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/irrigation
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biotechnology
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global
[14] http://admin.indiaenvironmentportal.org.in/category/thesaurus/food-security
[15] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rainfall