Effects of different nitrogen fertilizer levels on yield, leave color, and content of bioactive compounds of Pouzolzia zeylanica L. Benn
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Abstract
The study was carried out to investigate the effect of 4 levels of nitrogen fertilizer (10, 15, 20 and 25 kg urea/1000 m2) applied on the color of leaves (chlorophyll index SPAD and the red-purple color by a* value in Hunter’ color system), yield and bioactive compounds content (anthocyanin, flavonoid, polyphenol and tannin) of Pouzolzia zeylanicaplant. The results showed that different nitrogen fertilizer levels had significant effects (P < = 0.05) on leave color, yield and content of bioactive compounds of this plant. At the level of 20 kg urea/1000 m2, the leaves had red-purple color and the obtained a* value was 8.06; the index of chlorophyll SPAD was 38.36; the yield was 1.64 ton/1000 m2, and the content of bioactive compounds was higher than other nitrogen fertilizer levels. The contents of anthocyanin, flavonoid, polyphenol and tannin were 0.296 mg CE/g dried material (DM), 5.03 mg QE/g DM, 15.54 mg GAE/g DM and 10.05 mg TAE/g DM, respectively.
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