Three different representative soil types—aeolian, sierozem and irrigation silting soil were studied.
Rui Wang, Quan Sun, Qingrui Chang 2015, 'Soil Types Effect on Grape and Wine Composition in Helan Mountain Area of Ningxia',PLOS ONE10.1371/journal.pone.0116690. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)