摘要：A study was conducted to determine the impacts of two different effects of sulfur on the amino acid composition in corn seed at Aydin, Turkey, during 2013 and 2014. Sulfur doses (D1 and D2) were calculated as 400 kg ha-1 and 800 kg ha-1 with the cation exchange capacity (CEC) of the soil. SD1 and SD2 parcels (a D1 and D2 dose application on the sowing date, respectively), BD1 and BD2 parcels (a D1 and D2 dose application 60 days before the sowing date), standard fertilization without sulfur [210 kg.ha"1 pure nitrogen (NH4N 0 3), 60 kg.ha'1 phosphor (P2Os) and potassium (K20)] and nonfertilized parcels were established to assess the effectiveness of sulfur over time. Amino acid content (essential, conditionally essential and nonessential) of the corn seeds obtained from the different treatment parcels was measured using HPLC. According the results, significant differences among treatments and between years were found. Leucine and tyrosine increased with standard fertilization during the two years. Moreover, valine, isoleucine, lysine, cysteine and alanine increased under the SD1 treatment. Proline and cysteine increased under BD1 and isoleucine and cysteine increased under the BD2 treatment during the two years. Thus, some positive effects were noted even with only standard fertilization. Moreover, SD1 (400 kg ha-1 sulfur) can be recommended for practical applications because of the low application amount and ease of application with sowing. An application of 800 kg ha-1 sulfur (SD2) at sowing cannot be recommended, as no specific effect on amino acid composition was found.
