Responseof The Flag Leaf Photosynthesis to Different Growing Seasons and Nitrogen Levels in Early Maturing Line of Rice at Ripening Stage

Date Received: 15-08-2014

Date Accepted: 20-09-2014

Date Published: 06-08-2025

##submissions.doi##: https://doi.org/10.31817/tckhnnvn.2014.12.8.

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Issue: Vol. 12 No. 8 (2014)

Section:

NÔNG HỌC

How to Cite:

Huong, D., Hanh, T., Hoan, N., & Cuong, P. (2025). Responseof The Flag Leaf Photosynthesis to Different Growing Seasons and Nitrogen Levels in Early Maturing Line of Rice at Ripening Stage. Vietnam Journal of Agricultural Sciences, 12(8), 1157–1167. https://doi.org/10.31817/tckhnnvn.2014.12.8.

Responseof The Flag Leaf Photosynthesis to Different Growing Seasons and Nitrogen Levels in Early Maturing Line of Rice at Ripening Stage

Do Thi Huong (*) , Tang Thi Hanh , Nguyen Van Hoan , Pham Van Cuong

  • Tác giả liên hệ: [email protected]

    • Keywords

    Early maturing rice line, flag leaf photosynthesis, growing season

    Abstract


    Pot experiments were carried out in the green house at the Faculty of Agronomy in 2012 summer and 2013 spring seasons under low nitrogen (N1), intermediate nitrogen (N2) and high nitrogen (N3) levels to investigate flag leaf photosynthesis of a newly developed line of rice with early maturity andthe check cultivar IR 24. The experiments were arranged in randomized complete block (RCB) with 4 replications. At the heading stage, 7, 14 and 21 days after heading (DAH), a pot from each treatment was randomly selected to measure photosynthetic rate. Grain yield and yield components, were determined at harvesting stage. The results showed that season and nitrogen level affected photosynthetic rate at allstages. A significant and positive correlation between percentage of filled spikelets,1000 grain weight of IL19-4-3-8 and phototsynthetic rate at heading stage and 7DAH in summer growing season. Grain filling percentage of IL19-4-3-8 closely related with photosynthetic rate at heading stage and 1000 grain weight associated more closely with photosynthetic rate at heading stage and 7DAH than that at 14 and 21DAH inspring growing season. Photosynthetic rate at heading stage and after heading stages had great contribution to grain filling percentage and  1000 grain weight of IR 24 in both seasons.

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