High soil redox potential contributes to iron deficiency in drip-irrigated rice grown in calcareous Fluvisol

Xinjiang Zhang, Jianwei Hou, Xiaojuan Wang, Zhiyang Zhang, Fei Dai, Juan Wang and Changzhou Wei
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Xinjiang Zhang: Key Lab of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Shihezi University, Shihezi, P.R. China
Jianwei Hou: Key Lab of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Shihezi University, Shihezi, P.R. China
Xiaojuan Wang: Tianye Agriculture Research Institute, Tianye Group Ltd. of Xinjiang, Shihezi, P.R. China
Zhiyang Zhang: Key Lab of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Shihezi University, Shihezi, P.R. China
Fei Dai: Key Lab of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Shihezi University, Shihezi, P.R. China
Juan Wang: Key Lab of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Shihezi University, Shihezi, P.R. China
Changzhou Wei: Key Lab of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Shihezi University, Shihezi, P.R. China

Plant, Soil and Environment, 2019, vol. 65, issue 7, 337-342

Abstract: Drip-irrigated rice (Oryza sativa L.) is susceptible to iron (Fe) deficiency. The major possible cause of Fe deficiency is the changes in the water regime, which mainly affects the redox potential (Eh) of the soil dictating the solubility of Fe. However, how high soil Eh affects soil available Fe and rice Fe uptake is unclear. In this paper, we investigated the effect of soil Eh on rice Fe uptake under different water management strategies (drip irrigation (DI), flood irrigation (FI) and forced aeration of soil in flooding irrigation (FIO)). The results showed that the diethylenetriaminepentaacetic acid (DTPA)-extractable Fe and Fe(II) concentration in the soil, Fe concentration and chlorophyll contents of leaves and biomass of rice in FIO were greater than those in DI but significantly less than those in FI. The Fe uptake of the plant in DI was the lowest, but which in FI was the highest. Overall, FIO resulted in a significant reduction in Fe uptake of rice, but greater than that in DI. We concluded that both the decreased soil water content and the increased soil Eh were important factors that caused Fe deficiency of drip-irrigated rice.

Keywords: iron deficiency chlorosis; iron uptake; water-saving cultivation; water stress; nutrition (search for similar items in EconPapers)
Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:65:y:2019:i:7:id:178-2019-pse

DOI: 10.17221/178/2019-PSE

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