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土壤根据它的发生学的剖面形态、堆积样式等分为土壤统,土壤统下根据生产力的不同细分为土壤区。生产力的分级是对于区分了的土壤区,根据土壤所持有的阻害因子、限制因子或者土壤恶化危险性的种类、程度等,把各地土壤区的土壤生产力,分为Ⅰ到Ⅳ等级。Ⅰ级是有正常的收获量,只要进行正当的土壤管理,则几乎或完全没有阻害因子、限制因子或土壤恶化的危险性的良好土壤;Ⅱ级是有若干问题的土壤;Ⅲ级是存在有重大的阻害因子的士壤;Ⅳ级的问题多,做为耕地利用有困难的土壤。
The soil is divided into soil systems according to its generative profile and stacking pattern, and the soil is subdivided into soil regions according to different productivity. The classification of productivity is divided into soil areas, according to the soil holding resistance factor, limiting factor or the risk of soil deterioration of the type, extent, etc., soil productivity in the soil area around, divided into Ⅰ to Ⅳ level. Level I is a normal level of harvest and there is little or no good soil for hazard, restriction, or soil deterioration as long as proper soil management is available; Grade II is soil with several problems; Grade III is the presence of Significant resistance factor disabilities soil; Ⅳ level of many problems, as the use of soil is difficult to use.