Growth and Yield of Rice (Oryza sativa L.) under Different Irrigation Methods in Transplanted and Direct-seeded Systems

Authors

• Wang Guirui, College of Agronomy, Hunan Agricultural University, Changsha 410128, P. R. China 2 Institute of Crop Science, College of Agriculture and Food Science, University of the Philippines Los Baños (UPLB), Laguna 4031, Philippines
• Crisanta S. Bueno, Institute of Crop Science, College of Agriculture and Food Science, UPLBFollow

Publication Date

6-1-2026

Abstract

In the face of climate change and socioeconomic transformation, there is an urgent need to save energy and enhance rice production. Direct-seeded rice (DSR) is a viable alternative to transplanted rice due to reduced water and labor requirements, potentially achieving comparable or higher yields with reduced inputs. This study was conducted in the 2025 dry and wet seasons in Los Baños, Philippines, using a 2-factorial randomized complete block design with 4 replications. The first factor was the 2 rice varieties NSIC Rc 506 (Tubigan 41, V1) and NSIC Rc 160 (Tubigan 14, V2), and the second factor was cultural management, combining crop establishment method and water regime (T1: transplanted and flooded; T2: direct-seeded and flooded; T3: direct-seeded and saturated). Results showed that during the dry season, DSR flooded rice (T2) yielded the highest, especially V2T2 (638.06 g m⁻²), with earlier phenology, higher tiller density, greater late season crop growth rate (CGR), and better yield components. During the wet season, V1 (315.37 g m⁻²) produced 86.3% higher grain yield than V2 (169.20 g m⁻²), which was associated with a higher harvest index and a greater number of panicles, while the effects of cultural management on yield were not significant. Flooded irrigation outperformed saturated irrigation across seasons, improving leaf area index, CGR, and yield. Dry season interactions were absent, while wet season interactions were significant for biomass and yield components. V2T2 maximized dry season yield, and V1T2 stabilized wet season yield, with findings specific to this single site, 1-yr pot experiment.

Recommended Citation

Guirui, Wang and Bueno, Crisanta S. (2026) "Growth and Yield of Rice (Oryza sativa L.) under Different Irrigation Methods in Transplanted and Direct-seeded Systems," The Philippine Agricultural Scientist: Vol. 109: No. 2, Article 19.
Available at: https://www.ukdr.uplb.edu.ph/pas/vol109/iss2/19