The aim of this research was to obtain the type and the equilibrium of synthetic and natural N fertilizer dosage which can give the best growth and yield for sweet corn plant (Zea mays L. saccharata). The research was conducted using a single factor experimental method that arranged in Completely Randomized Design. The treatment was urea fertilizer dosage balance with 2 types of natural fertilizer cow manure and cow's blood which is as follows: 100% synthetic nitrogen fertilizer (Urea), 75% urea + 25% cow manure, 50% urea + 50% cow manure, 25% urea + 75% cow manure, 100% cow manure, 75% urea + 25% cow blood, 50% urea + 50% cow blood, 25% urea + 75% cow blood, 100% cow blood fertilizer, without nitrogen fertilizer (Control). Each treatment was repeated 3 times and each experimental unit consists of 3 sample plants and 2 victim plants. The observed variabel were height, number of leaves, dry weight, leaf area, leaf area index, crop growth rate (CGR), net assimilation rate (NAR), number of cob per plant, weight of sweet corn with the husk, and weight of sweet corn without the husk. The results showed that natural N fertilizer from cow manure combined with urea gave better growth and yield on sweet corn compared with natural N fertilizer from cow's blood combined with urea. A balance of 75% urea and 25% of cow manure gave the best growth and yield of sweet corn.