Nanoparticles and nanotechnology have been applied in agriculture, including for plant nutrition improvement, and pest control. Nano-calcium carbonate in plant protection and nutrition. Nano-calcium carbonate finner/smaller the particle size will aid in easy absorption in soils. Nano-calcite fertilizer enhance the growth of plants, enhance yield of many crops, seed quality and resistivity, enhance crop biomass, crop productivity, crop growth, vigor, improves resistance against pest and diseases and abiotic stress and longer storage life. Nano calcite is being used intensively as an environmentally friendly alternative for some synthetic fertilizers.