Comparison on physiological adaptation and phosphorus use efficiency of upland rice and lowland rice under alternate wetting and drying irrigation

Tao Song, Feiyun Xu, Wei Yuan, Yingjiao Zhang, Tieyuan Liu, Moxian Chen, Qijuan Hu, Yuan Tian, Weifeng Xu, Jianhua ZHANG*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

As one of the most widely promoted water-saving irrigation strategies for rice, alternate wetting and drying irrigation (AWD) can not only save water but also increase mineral nutrient use efficiency. In this study, we compared the growth conditions of four rice varieties (two lowland and two upland varieties) under three irrigation regimes: continuously flooded (CF), alternate wetting and moderate soil drying (AWD15) and alternate wetting and severe soil drying (AWD30). AWD15 and AWD30 enabled the plants to receive fewer irrigation events and less irrigation water than CF, thereby saving both water resources and labor. AWD15 reduced redundant vegetative growth, promoted root growth, and increased the root-shoot ratio and harvest index. AWD15 increased the grain yield, water use efficiency (WUE) and phosphorus use efficiency (PUE) of upland rice and maintained the grain yield while increasing the WUE and PUE of lowland rice. More developed root systems under AWD helped upland rice to maintain a higher water status than lowland rice when plants were subjected to soil drying, which resulted in superior performance in grain yield in upland rice. AWD30 could not reconcile the demands of higher yield and the desire to reduce irrigation water use because it decreased grain yield. The results indicate that AWD15 irrigation of rice can not only increase rice yield and WUE but also enhance PUE, which can potentially reduce the use of phosphorus fertilizers. The results provide theoretical and technical support for improving rice cultivation.

Original languageEnglish
Pages (from-to)195-210
Number of pages16
JournalPlant Growth Regulation
Volume86
Issue number2
DOIs
Publication statusPublished - 1 Nov 2018

Scopus Subject Areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science

User-Defined Keywords

  • Phosphorus use efficiency
  • Root growth traits
  • Root oxidation activity
  • Water use efficiency
  • Water-efficient irrigation

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