Groundwater Level Effect on Redox Potential, on Cadmium Uptake and Yield of Soybean

Md. Zahidul Haque^1*, Choichi Sasaki², Nobuhiko Matsuyama², Takeyuki Annaka³, Chihiro Kato²

¹United Graduate School of Agricultural Sciences (UGAS), Iwate University, Morioka, Japan.
²Faculty of Agriculture and Life Science, Hirosaki University, Hirosaki, Japan.
³Faculty of Agriculture, Yamagata University, Tsuruoka, Japan.

DOI: 10.4236/ajps.2014.520319                

Abstract

In this greenhouse experiment, we investigated the effects of two constant groundwater levels: 10 cm groundwater level (GW-10) and 40 cm groundwater level (GW-40) and one change groundwater level, which was 40-10-40 cm (GW-40-10-40) on Cadmium (Cd) uptake and seed yield of Soybean plant in Cd contaminated soils (1.57 mg·kg^-1). The experimental soil layer was made with gravel layer (14 cm), non-polluted soil (15 cm) and polluted soil (25 cm). The redox potential of every soil layer was measured from sowing to harvesting. The soil layer (10 – 40 cm) of GW-10 was always in reduction condition and that of GW-40 was always in oxidation condition. First 50 days of GW 40-10-40 were in oxidation and next 50 days in reduction and final 20 days again returned in oxidation condition. Soybean seed Cd concentration was significantly highest in GW-40-10-40 (1.16 ± 0.13 mg·kg^-1) and lowest in GW-40 (0.81 ± 0.12 mg·kg^-1). Cd concentration of stem was found significantly higher in GW-40 (1.7 ± 0.2 mg·kg^-1) than GW-10 (0.91 ± 0.08 mg·kg^-1) and GW-40-10-40 (1.28 ± 0.13 mg·kg^-1). There was no significant difference in root Cd concentration among these 3 treatments. Main stem height of soybean plant and 100 seed weight of GW-40 were significantly higher than those of GW-10. The result revealed that, soil redox condition is an important factor for Cd uptake in soybean plant and seed yield of soybean. This study will help to manage the farming process more appropriately with the aim of minimizing uptake of Cd and other toxic metals in grain crops.

Keywords

Groundwater Level, Redox Potential (Eh), Cadmium Uptake, Soybean Seed Yield

Conflicts of Interest

The authors declare no conflicts of interest.

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