Reconstructed organic rice fields: Effects on soil organic carbon, total nitrogen, their mineralization, and rice yield in Japanese Andosols

doi:10.1016/j.jia.2025.07.007

Journal of Integrative Agriculture ›› 2026, Vol. 25 ›› Issue (2): 493-500.DOI: 10.1016/j.jia.2025.07.007

收稿日期:2025-01-31 修回日期:2025-07-07 接受日期:2025-06-13 出版日期:2026-02-20 发布日期:2026-01-06

Reconstructed organic rice fields: Effects on soil organic carbon, total nitrogen, their mineralization, and rice yield in Japanese Andosols

Valensi Kautsar^{1, 2}, Takamori Kanno^{3, 4}, Kaho Sakai³, Riza Kurnia Sabri^{3, 5}, Keitaro Tawaraya³, Kazunobu Toriyama^{3, 6}, Kazuhiko Kobayashi⁷, Weiguo Cheng^{1, 3#}

¹The United Graduate School of Agricultural Sciences, Iwate University, Morioka 020-8550, Japan
²Faculty of Agriculture, Stiper Agricultural University, Yogyakarta 55283, Indonesia
³Faculty of Agriculture, Yamagata University, Tsuruoka 997-8555, Japan
⁴Fukushima Prefecture Soso Agriculture and Forestry Office, Tomioka, Fukushima 975-0031, Japan
⁵Faculty of Agriculture, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia
⁶Japan International Research Center for Agricultural Sciences, Tsukuba 305-8686, Japan
⁷Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan

Received:2025-01-31 Revised:2025-07-07 Accepted:2025-06-13 Online:2026-02-20 Published:2026-01-06
About author:#Correspondence Weiguo Cheng, E-mail: cheng@tds1.tr.yamagata-u.ac.jp
Supported by:
This study was partly supported by the Yamagata University YU-COE(S) program and by the Advanced Agri-food System Research Center of Yamagata University, Japan. This research was financially supported by a Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Scientific Research (26310304) and Yamagata University YU-COE(S) program and by the Advanced Agri-food System Research Center of Yamagata University, Japan.

摘要/Abstract

Abstract:

To examine the impact of anthropogenic land reconstruction, particularly the consolidation of small terraces into larger fields, on soil organic carbon (SOC), total nitrogen (TN) dynamics, rice yield, and its components, soil and plant samples were collected from seven newly reconstructed fields in Japanese Andosols in Tochigi, Japan. Samples were obtained from both the former low- and high-elevation sides within each field plot. During harvest season, nine rice plants were randomly selected from each plot (0.675 m2, comprising 3 rows and 3 hills per row), collected from a 3-m stretch along both the east (former low side) and west (former high side) ridges. Soil cores were collected from identical plots at two depths (0–15 and 15–30 cm) and combined into one composite sample per layer. Rice plant samples were air-dried for two weeks until reaching constant moisture content, after which stems and ears were separated and weighed to determine biomass, yield, yield components, and nitrogen uptake. This indicated that land reconstruction significantly affected rice yield and its components between the two sides of all field plots. SOC, TN, and their decomposition following land reconstruction showed notable changes, especially in the 15–30 cm subsurface soil layer. Additionally, grain weight demonstrated significant correlation with SOC, TN, and carbon decomposition in both the 0–15 and 15–30 cm layers, indicating that soil fertility to a depth of 30 cm was crucial for rice productivity after land reconstruction.

Key words: Japanese Andosols , different soil layers , organic rice farming , reconstructed fields , rice yield

Valensi Kautsar, Takamori Kanno, Kaho Sakai, Riza Kurnia Sabri, Keitaro Tawaraya, Kazunobu Toriyama, Kazuhiko Kobayashi, Weiguo Cheng. [J]. Journal of Integrative Agriculture, 2026, 25(2): 493-500.

Valensi Kautsar, Takamori Kanno, Kaho Sakai, Riza Kurnia Sabri, Keitaro Tawaraya, Kazunobu Toriyama, Kazuhiko Kobayashi, Weiguo Cheng. Reconstructed organic rice fields: Effects on soil organic carbon, total nitrogen, their mineralization, and rice yield in Japanese Andosols[J]. Journal of Integrative Agriculture, 2026, 25(2): 493-500.

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Reconstructed organic rice fields: Effects on soil organic carbon, total nitrogen, their mineralization, and rice yield in Japanese Andosols

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