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Cattle bone ash contain high calcium and phosphor that can be used as foliar fertilizer. The foliar application requires that the particle size must be smaller than the stomatal size. The study is expected that by applying cattle bone ash to sweet corn through foliar application can increase the growth and the production of sweet corn. The experiment was conducted in a complete randomized design with five treatment there are without cattle bone ash application, 0.1 %, 0.2 %, 0.3%, and 0.4% of cattle bone ash concentration. Cattle bone ash dominated with particle smaller than stomatal size and contain high calcium, oxygen and phosphor with little of sodium and magnesium. The result showed that 0.3% application of resize cattle bone ash could enhance leaves area, root dry weight, ear weight, 100 kernels weight, and net assimilation rate