Research Article Open Access

Effects of Nitrogen Fertilizer on Grain Yield and Fragrant Contents in two Thai Rice Varieties

Ayut Kongpun1 and Chanakan Thebault Prom-u-Thai2
  • 1 Kalasin University, Thailand
  • 2 Chiang Mai University, Thailand


Nitrogen (N) is commonly applied in rice crop production for improving grain quality and productivity. This experiment aimed to evaluate how applying N fertilizer affects the concentration of 2-Acetyl-1-Pyrroline (2AP), the major fragrant compound in rice grains, between two selected rice varieties with high yield potential and fragrant scent, Pathum Thani 1 (PTT1) and RD22. Rice plants were grown in pot conditions and N fertilizer was applied in three rates at 2.44, 3.82 and 5.66 g N/pot designated as N1, N2 and N3, respectively. Rice samples were harvested at maturity and evaluated for grain yield, grain N and 2AP concentration. The results revealed that grain yield and concentration of N and 2AP were affected by N rates differently between the varieties; RD22 had higher grain yield and the concentrations of N and 2AP than PTT1 with all N rates. Grain N concentration in both varieties increased when increasing N rates. There was highly positive correlation between grain N and grain 2AP concentration among the N rates and varieties. We conclude that applying N in rice cultivation not only improves productivity but also enhances the quality of rice grains by improving the concentrations of N and 2AP, the magnitude of the effect depending on the rice variety.

OnLine Journal of Biological Sciences
Volume 21 No. 3, 2021, 206-212


Submitted On: 4 May 2021 Published On: 18 July 2021

How to Cite: Kongpun, A. & Prom-u-Thai, C. T. (2021). Effects of Nitrogen Fertilizer on Grain Yield and Fragrant Contents in two Thai Rice Varieties. OnLine Journal of Biological Sciences, 21(3), 206-212.

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  • Fragrant Rice
  • Aroma Rice
  • Nitrogen Fertilizer
  • 2-Acetyl-1-Pyrroline (2AP)