Response Of NPK Fertilizer and Manure Application On the Growth and Yield Of Sweet Corn (Zea mays saccharata Sturt L.) in Gresik
Abstract
This study aims to analyze the effect of NPK fertilizer and manure application on the growth and yield of sweet corn (Zea mays saccharata Sturt L.). The research was conducted using a factorial design with two factors: NPK fertilizer dosage and manure dosage. Parameters observed included plant height, number of leaves, stem diameter, ear length, ear diameter, and the fresh weight of ears without husks. Data were analyzed using Analysis of Variance (ANOVA), followed by the Least Significant Difference (LSD) test at a 5% level, and a correlation test to determine the relationship between growth and yield parameters. The results showed that NPK fertilizer had a significant effect on the vegetative growth of sweet corn, particularly on plant height at 1, 3, and 7 Weeks After Planting (WAP), the number of leaves at 1, 3, 5, and 9 (WAP), and stem diameter at 3–9 (WAP). Statistically, manure did not show a significant effect on most parameters, although it showed a numerical trend toward increased growth. Regarding yield components, ear length showed no significant effect, while ear diameter and fresh weight of ears without husks were significantly influenced by NPK fertilizer. Numerically, the highest fresh ear weight was obtained from the treatment of 0.44 g NPK/plant combined with 10.6 g manure/plant. Correlation analysis revealed that the number of leaves and stem diameter have a strong to very strong positive relationship with the fresh weight of ears without husks, and ear length was the most dominant yield component in determining harvest weight. Overall, this study concludes that increasing sweet corn productivity is highly determined by the successful formation of vegetative structures starting from the early growth phase.
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