Corn (Zea mays) is a vital global crop that is used for human consumption, livestock feed, and biofuel production. It also enhances crop rotation systems by improving soil quality and reducing erosion. This study assessed the effects of six compost types, derived from various organic wastes, on the growth, yield, and physiological performance of GS210 corn. A pot experiment was conducted using six compost variants and two control treatments—one without fertilizer and another with NPK mineral fertilization.
The key indices of chlorophyll fluorescence, such as Fv/Fm (0.80, 0.80, 0.81), Fv/F0 (4.07, 3.99, 4.03), and photosynthetic efficiency (PI: 4.62, 4.22, 5.21) were highest in compost-treated plants, indicating their enhanced photosynthetic performance. Among the growth parameters, NPK fertilization showed the greatest benefits, with plant height reaching 188.9 cm, cob length reaching 17.5 cm, 324 grains per cob, and a thousand-grain weight (MTZ) of 285.2 g. The grain protein content also increased under mineral fertilization (9.5%) compared to the control (8.5%).
Organic fertilizers performed slightly less well in terms of yield but still surpassed the control, with grain protein contents ranging from 9.1% to 9.3%. The compost treatments involving sewage sludge and garden waste, Compost 2 and Compost 4, demonstrated comparable results to NPK in certain parameters, especially in photosynthesis and grain count. However, composts made solely from garden waste showed reduced effectiveness during corn’s rapid growth stages.
In conclusion, while NPK mineral fertilization produced the highest growth and yield, certain compost variants proved effective alternatives, particularly for improving soil and plant health. These findings suggest that combining organic fertilizers with mineral nitrogen could optimize corn production, and further study is warranted to refine these approaches for the development of sustainable agriculture.