Dynamics Of Photosynthetic Pigments And Correlation With Grain Yield In Rice (Oryza Sativa L.) Varieties Under The Influence Of Nitrogen Fertilizers

This article investigates the effect of nitrogen fertilizer rates on the content of leaf pigments and grain yield in rice (Oryza sativa L.) varieties. The study was conducted under laboratory conditions on the rice varieties “Sadaf,” “Ziynat,” and “Billur.” Spectrophotometric methods were used to determine the levels of chlorophyll “a,” chlorophyll “b,” total chlorophyll, and carotenoids in the leaves. The results showed that increasing nitrogen rates led to an increase in leaf pigment content. The highest values were observed at N120–150 rates. Correlation analysis revealed a relationship between chlorophyll “a” and total chlorophyll content with grain yield (r = 0.72–0.91). Variety-specific analysis indicated that in the “Sadaf” variety, the correlation between pigment content and yield was the highest. The findings confirm that leaf pigment content is an important indicator for assessing the yield potential of rice varieties.