Fuente: WIPO "tomato" Certain embodiments of the invention provide new nanomaterials (e.g., fertilizer nanoparticles) and methods suitable for delivery (e.g., foliar delivery) of nutrients such as Calcium, phosphorous, and/or nitrogen to plants (e.g., controlled by the plant pH gradients). For example, nitrogen uptake and utilization efficiency may be enhanced by the nanomaterials and use thereof as described herein.