PJB-2024-124
The Impact of Different Organic Fertilizers on the Antioxidant Properties of Sweet Corn (Zea mays L. var. saccharata Sturt.) as a Substitute for Chemical Fertilizers
Recep SAHIN
Abstract
This study was conducted to determine the effect of different organic fertilizers on the antioxidant properties of Merit sweet corn varieties. The experiment was carried out in three replications according to the randomized block trial design at the Agricultural Research Institute of East Mediterranean Transitional Zone in Turkey. Composed fertilizer (15N.15P.15K) was used as a mineral fertilizer source, and organic fertilizer sources (poultry manure, farm manure, fermented manure, vermicompost, and leonardite), which are equivalent to the content of mineral fertilizer, containing 100 kg pure N, 100 kg P2O5, and 100 kg K2O per hectare were used. In this study, the antioxidant properties of the grain, which are total yellow pigment content (TYPC), total phenolic capacity (TPC), total antioxidant capacity (TPC), total flavonoids capacity (TFC), 2,2-diphenyl-1-picrylhydrazyl radical scavenging assay (DPPH), DPPH inhibition, and ferric reducing/antioxidant power assay (FRAP) showed statistically significant differences for different fertilizer sources while no significant changes were found in total phenolic and total antioxidant capacity. In this context, TYPC, TFC, TPC, TAC, DPPH, and FRAP were found to be highest in leonardite, whereas FRAP showed the highest mean value for farm manure. Results indicated that different organic fertilizer sources significantly affected the grain's antioxidant properties, with leonardite showing the most advantageous results. However, it would be beneficial to use more sweet corn genotypes and consider different fertilizer doses in future studies.
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