Application of the relationships between soil chemical properties in upland field, Chiba prefecture [Japan] to soil diagnosis
2006
Yamaki, A.(Chiba-ken. Agriculture Research Center (Japan)) | Shinoda, M. | Yasuda, M. | Ushio, S. | Saito, K. | Oshida, T. | Anzai, T.
Results of monitoring upland field soil at 276 sites in Chiba Prefecture showed that soil electric conductivity (EC) was related to water-soluble anion content and pH to the base-saturation degree. The finding was used to estimate pH (corrected pH) under low EC, less than 10 mS/m. 1. When soil EC was lower than 100 mS/m, it increased with increased nitrate ion contents and the following equation was found between EC (x) and nitrate-nitrogen content (y): y = 0.00173xE2 + 0.13lx - 0.0129 (RE2 = 0.67). When the EC was 100 mS/m or higher, high contents of chloride or sulfate ions were often found in the field soil. 2. The following equation was derived from the relationship between pH (H.O) and the basesaturation degree, grouped by EC: corrected pH = pH (H2O) - 0.000097xE2 + 0.018lx (x: EC). 3. When the fields were grouped into 0. less than 10, 10 - less than 20, 20 - less than 30, and 40 or more in cation exchange capacity (CEC,me/100 g), average base-saturation degree was 120, 110, 81, 72, and 66%, respectively. Base-saturation degree tended to be higher in soil with lower CEC.
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