IPI International Potash Institute
IPI International Potash Institute

Scientific abstracts

Title:
Potassium Behavior and Clay Mineral Composition in the Soil with Low Effectiveness of Potassium Application
Authors:
Kubo, K., T. Hirayama, S. Fujimura, T. Eguchi, N. Nihei, S. Hamamoto, M. Takeuchi, T. Saito, T. Ota, T. Shinano
Published in:
Soil Science and Plant Nutrition 64(2):265-271 (2017), English

Abstract:

Increasing exchangeable potassium (ExK) content in soil to an appropriate level is important to mitigate the transfer of radioactive cesium to crops. We focused on a buckwheat (Fagopyrum esculentum Moench) field with a low ExK content, despite the application of K, in Fukushima Prefecture, Japan (Field A), following the Tokyo Electric Power Company Fukushima Dai-ichi (No. 1) Nuclear Power Plant accident in March 2011. We examined the relationship between K concentration and clay mineral composition in the soil of Field A and compared the findings with another field in Fukushima Prefecture (Field B) to clarify whether K applied to the soil was leached or remaining fixed. Pot experiments showed that K concentration in water seepage from pots following irrigation was significantly lower in pots from Field A than in those from Field B. Soil ExK content after soybean cultivation was lower in soils of Field A than those of Field B. These results indicate that K applied to Field A was fixed in the soil. Analysis of clay mineral composition confirmed the distinctive vermiculitic nature of Field A soils. This clay mineralogy would be associated with the higher K fixation ability of Field A than Field B soils. This study demonstrated that K fixation in vermiculite was a factor preventing the increase in ExK content from K application to Field A.

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