| 1. | The black earth is a kind of alfisol , with a thick layer of humus , loose texture , high fertility , high porosity ratio , poor permeability and a high content of clay , which is suitable for cultivation
摘要黑土是一种腐殖质层厚，质地松散，肥力很高，孔隙比较大而透水性差，粘粒含量高，适于耕作的淋溶土。 |
