@article{Nguyen Thanh_Ho Quang_Le Thai_Le Anh_Nguyen Quyet_Lai Quang_Kikuvi Kyenze_Tran Thuy_2022, title={Upgrading the Vietnam semi-quantitative soil classification system}, volume={44}, url={https://vjs.ac.vn/index.php/jse/article/view/17245}, DOI={10.15625/2615-9783/17245}, abstractNote={<p>A quantitative soil classification system (SCS) has been the aim of generations of Vietnam soil scientists. The SCS is a system of harmonizing the traditional Vietnam SCSs and creating a capability for international exchange. Up to now, there are three partially developed Vietnam official SCSs and three Vietnam semi-quantitative ones. This article aims to upgrade the Vietnam semi-quantitative SCS based on Vietnam’s traditional pedogenetic (qualitative) and the World Reference Base for Soil Resources in 2014 (quantitative). For this purpose, a study was conducted to compare and analyze the correlation between the published Vietnam semi-quantitative SCSs and the official ones. Six SCSs were compared and analyzed. The results show that the Vietnam semi-quantitative SCS-2006 was selected to continue adapting and updating. Apart from the necessary adjustments, the study added 12 diagnostic horizons, 4 diagnostic properties, 2 diagnostic materials, 2 soil groups, 11 soil types, and 37 soil sub-types in the Vietnam semi-quantitative SCS-2006. Finally, the Vietnam semi-quantitative SCS includes 25 soil groups, 86 soil types, 492 soil sub-types with 30 diagnostic horizons, 7 diagnostic properties, 6 diagnostic materials, 58 qualifiers, and 9 criteria for defining soil varieties. The system keeps the traditional aspects of Vietnam’s official SCSs and allows the exchange of international soil information.</p>}, number={4}, journal={Vietnam Journal of Earth Sciences}, author={Nguyen Thanh, Tuan and Ho Quang, Duc and Le Thai, Bat and Le Anh, Tuan and Nguyen Quyet, Chien and Lai Quang, Trung and Kikuvi Kyenze, Stanslaus and Tran Thuy, Chi}, year={2022}, month={Jun.}, pages={502–520} }