Effects of Water-Saving and Controlled Drainage Water Management on Growth Indices of Mechanically Transplanted Rice Under Side Deep Fertilization Conditions

Ying Wang, Qingsheng Liu, Lihong Chen (), Qilin Lu, Shiwei Li, Neng Hu, Shitong Qiu and Shufang Wang
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Ying Wang: College of Water Conservancy, Yunnan Agricultural University, Kunming 650201, China
Qingsheng Liu: College of Water Conservancy, Yunnan Agricultural University, Kunming 650201, China
Lihong Chen: College of Water Conservancy, Yunnan Agricultural University, Kunming 650201, China
Qilin Lu: College of Water Conservancy, Yunnan Agricultural University, Kunming 650201, China
Shiwei Li: College of Water Conservancy, Yunnan Agricultural University, Kunming 650201, China
Neng Hu: College of Water Conservancy, Yunnan Agricultural University, Kunming 650201, China
Shitong Qiu: College of Water Conservancy, Yunnan Agricultural University, Kunming 650201, China
Shufang Wang: College of Water Conservancy, Yunnan Agricultural University, Kunming 650201, China

Agriculture, 2025, vol. 15, issue 8, 1-25

Abstract: This study aimed to improve water use efficiency at side deep fertilization paddy fields and reduce the direct discharge of tailwater from upstream dry-farming into Erhai Lake. Field experiments were conducted at Erhai Lake Basin in 2023 and 2024. In this study, paddies were used as storage basins. Two water managements were set with three replicates: flooding irrigation with deep storage and controlled drainage (CKCD), and water-saving irrigation with deep storage and controlled drainage (CCD). The rice growth indicators were observed. The results show that, in 2023, compared with CKCD, the root volume, root-to-shoot ratio, stem node spacing, stem diameter, plant height, tiller number, leaf area index and yield of CCD increased by 13.6, 19.6, 12.1, 4.1, 9.4, 3.0, 21.9, and 6.5%, respectively. For CCD, the total irrigation amount decreased by 27.3%, while irrigation productivity increased by 46.7%. In 2024, there were similar trends as in 2023. However, the tiller number and leaf area index of CCD decreased by 11 and 1.5%, respectively. Additionally, in CCD, the total irrigation amount decreased 52.5%, and the irrigation productivity increased by 1.4 kg/m 3 . There were similar regulars in soil temperature and its relationship with other growth indicates in 2023 and 2024. Soil temperature in CCD was generally higher than in CKCD. It positively correlated with stem diameter, but negatively with root volume. Additionally, root volume positively correlated with plant height and dry matter accumulation. Overall, the CCD approach could promote the indices of rice growth, increase the paddy capacity of tailwater storage, and reduce water consumption to further achieve water savings and increased yields.

Keywords: Erhai Lake Basin; side deep fertilization; water-saving and controlled drainage; rice; growth indices (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2025
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