C K Thankamani, V Srinivasan, S Hamza, K S Krishnamurthy. 2004. “Threshold Level of Soil Zine for Optimum Production of Ginger (Zingiber Officinale Rose.)”. Journal of Spices and Aromatic Crops 13 (1):55-57. https://updatepublishing.com/journal/index.php/josac/article/view/4790.