EFFECTS OF PLANT GROWTH-PROMOTING MICROORGANISMS, ORGANIC, AND INORGANIC FERTILIZER APPLICATIONS AND THEIR COMBINATIONS ON THE GROWTH AND YIELD OF SWEET CORN (Zea mays L. Saccharata Sturt) IN ULTISOL

Van, David (2025) EFFECTS OF PLANT GROWTH-PROMOTING MICROORGANISMS, ORGANIC, AND INORGANIC FERTILIZER APPLICATIONS AND THEIR COMBINATIONS ON THE GROWTH AND YIELD OF SWEET CORN (Zea mays L. Saccharata Sturt) IN ULTISOL. S3 thesis, Andalas University.

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Abstract

This study aimed to evaluate the effects of Plant Growth-Promoting Microorganisms (PGPM), organic fertilizer, and inorganic fertilizer and their combination on the growth and yield of sweet corn (Zea mays L. saccharata Sturt) in Ulisol. The experiment was conducted from July to October 2025 at the Faculty of Agriculture, Andalas University, Padang, Indonesia. A Completely Randomized Design (CRD) was used, consisting of six treatments with three replications: 1: PGPM, 2: Organic fertilizer (compost), 3: Inorganic fertilizer (NPK 15-15-15), 4: Organic 50% + PGPM, 5: Inorganic 50% + PGPM, and 6: Organic 50% + inorganic 50% + PGPM. Observed parameters included plant height, leaf area, stem diameter, root shoot ratio, net assimilation rate (NAR), relative growth rate (RGR), age of flowering, and yield components such as cob weight, length, diameter, and crop yield. The results revealed that fertilizer treatments significantly influenced several growth and yield parameters. The inorganic fertilizer treatment recorded the highest plant height, stem diameter, and yield performance, while the PGPM treatment showed the lowest values across most parameters. The combined treatment of organic 50% + inorganic 50% + PGPM produced growth and yield statistically similar to the full inorganic fertilizer, indicating a strong synergistic effect among the inputs. The integration of PGPM with organic and inorganic fertilizers enhanced nutrient uptake efficiency, improved plant vigor, and maintained high yield performance with reduced chemical fertilizer use. Based on the results, PGPM was not sufficient to supply the nutrient requirements of sweet corn; however, when combined with organic and inorganic fertilizers, it significantly improved growth and productivity. Inorganic fertilizer and Organic 50%+Inorganic 50%+PGPM showed best crop yield performance.

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