A positive response of rice rhizosphere to alternate moderate wetting and drying irrigation at grain filling stage

Zhou Li, Zhong Li, Puleng Letuma, Hong Zhao, Zhixing Zhang, Weiwei Lin, Hongfei Chen and Wenxiong Lin

Agricultural Water Management, 2018, vol. 207, issue C, 26-36

Abstract: Paddy fields are drained and irrigated several times during the whole rice growth period. Although studies have acknowledged the sensitivity of flooding and drainage in rice rhizosphere, current knowledge regarding how moderate drying at grain filling stage affects ecological characteristics of rice rhizosphere is limited. A field experiment with two irrigation regimes [alternate moderate wetting and drying irrigation (AMWD) and continuous irrigation (CI)] was conducted to investigate the changes in soil physical and chemical properties and microbial communities. Results from this investigation demonstrated that soil pH under AMWD was decreased, while Eh was increased. Moreover, soil electrical conductivity increased and decreased with a decline in soil water potential, interestingly all studied variables quickly recovered after re-watering.

Keywords: Alternate wetting and drying; Grain filling; Photosynthesis; Root activity; Soil redox potential (Eh); T-RFLP (search for similar items in EconPapers)
Date: 2018
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Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:agiwat:v:207:y:2018:i:c:p:26-36

DOI: 10.1016/j.agwat.2018.05.022

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