The study looked at how different organic nitrogen sources affect the growth and quality of amaranth plants. They tested nine treatments, including using various organic materials like vermicompost and poultry manure as sources of nitrogen. The results showed that a specific combination of organic sources led to the highest levels of chlorophyll, carotenoids, protein, and iron in the plants. This suggests that using a mix of organic nitrogen sources can improve the quality of amaranth crops.