**6. Preparation of coated nano fertilizer granules**

i. MAP & commercial urea granules sieved to obtain 2000–3350 um and 1676–2000 um size, respectively.

ii. Coating of MAP and Urea granules by Zn @ 1.5% by weight (by adding powder of ZnO nano particles.

iii. Spraying of ultrapure deionized water and use of nebulizer to provide good blending agent (50 uL/min) to ZnO powder.

iv. Coated granules are air-dried at 30% RH in the laminar flow.
