Changes in soil properties for 6 years of using the freshwater snail (Ampullaria tischbeini Dohrn) in a reclaimed sodic soil
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A field experiment was carried out to assess the effects of using the freshwater snail (Ampullaria tischbeini Dohrn) in a reclaimed sodic soil that contains low salt concentrations for 6 years.
Materials and methods
A field experiment was conducted during 2010–2015 at the experimental station located in Yomju County, North Phyongan Province, DPR Korea. Initial soil sampling was performed at random from the plots after rice harvest just before the start of the experiment in the early November 2009; these were analyzed for basic soil properties such as pH, macronutrients, exchangeable cations, bulk density, and water infiltration. Soil sampling for the present study was performed after the rice harvest each year for 6 years, to determine the effect of using A. tischbeini on soil properties.
Results and discussion
The bulk density and infiltration rate in the experimental plots with snails were significantly improved as compared to the control plot without snails at 0–10, 10–20, and 20–30 cm soil depths. Compared to controls, the experimental plots had significantly higher pH (average 5.6 vs. 4.6, P < 0.01) and organic matter content (average 3.5 vs. 1.9%, P < 0.01). Calculations for 0–10 cm soil depth showed that the experimental plots with snails contained 38.3 and 33.1 mg kg−1 more N and P contents than control plots without snails, respectively. Like N and P, the soil in the experimental plots had significantly higher available K contents compared with control plots. The soil also showed a dissimilar pattern of change in the concentration of exchangeable ions (Na+, Ca2+, and Mg2+) with a decrease in the Mg2+ to Ca2+ ratios.
A. tischbeini plays an important role in the improvement of soil physical-chemical properties, although our field experiment with the snail has not been carried out under different conditions of soil, climate, distribution of crops, fertilizer application, and agricultural management. Further work now needs to assess the direct effects of the use A. tischbeini on soil microbes and micronutrients under different field conditions.
KeywordsAmpullaria tischbeini (Dohrn) Exchangeable cations Freshwater snail Macronutrients Soil properties Responsible editor: Claudio Bini
The authors would like to thank Dr Ui-Jong Ri for his help with the extraction and analysis of soil samples. We are grateful to an anonymous reviewer for constructive feedback that has improved this paper.
This work was funded through the Agricultural Development Plan for DPR Korea 2008–2017, funded by the Government of the DPR Korea.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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