Sweet corn (Zea mays saccharata Sturt L.) is a horticultural crop with high economic value; however, its productivity is often constrained by low soil fertility and heavy dependence on inorganic fertilizers. The combined application of organic manure and phosphorus fertilizer is considered a promising strategy to improve plant growth and yield. This study aimed to evaluate the effects of cattle manure and phosphorus fertilizer on the vegetative and generative growth of sweet corn and to determine the interaction between the two fertilizer types. The experiment was arranged in a factorial randomized complete block design with two factors: cattle manure at three application rates (10, 20, and 30 t ha⁻¹) and phosphorus fertilizer (SP-36) at three rates (0, 100, and 200 kg ha⁻¹), with three replications. Observed variables included plant height, leaf number, stem diameter, days to flowering, and ear length. Data were analyzed using analysis of variance at the 5% significance level, followed by Duncan's Multiple Range Test when significant differences were detected. The results showed that cattle manure significantly increased leaf number and ear length and highly significantly affected stem diameter and flowering time, but had no significant effect on plant height. Phosphorus fertilizer did not significantly affect any observed variable, although it showed a positive trend in plant growth. A significant interaction between cattle manure and phosphorus fertilizer was observed only for stem diameter. Overall, the application of cattle manure at 30 t ha⁻¹ produced the best vegetative growth and yield performance, while the combination of 20 t ha⁻¹ cattle manure and 100 kg ha⁻¹ phosphorus fertilizer resulted in the largest stem diameter. Keywords: horticultural, inorganic fertilizers, organic manure and phosphorus fertilizer

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