MICRO-NUTRIENT FORMULATIONS FOR AGRICULTURE Part-H. Copper, Zinc, Manganese and Chromium Preparation. Pakistan Journal of Scientific & Industrial Research [Internet]. 2022 Jun. 9 [cited 2026 Mar. 11];37(8):326-9. Available from: https://www.v2.pjsir.org/index.php/biological-sciences/article/view/2703