shiv pratap singh, “LEAF CHLOROPHYLL METER- A NON-DESTRUCTIVE METHOD FOR SCHEDULING NITROGEN IN POTATO CROP”, PotatoJ, vol. 46, no. 1, Aug. 2019, Accessed: Jun. 24, 2026. [Online]. Available: https://epubs.icar.org.in/index.php/PotatoJ/article/view/84766