After Lie Lou city and the evolution of the Eastern Han Dynasty to the Grand town, the Northern Wei Liu donkey and the city of the Yuan lu Kun city.

以后，埒娄城又演变为东汉的爵离城、北魏的柳驴城和元代的坤闾城。

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[LU Ru-kun. The Principle of Nutrition of Soil-Plant and fertilization [m]. Beijing: Chemistry industry press, 1998.].

[31]鲁如坤。土壤-植物营养学原理和施肥[M]。北京：化学工业出版社，1998。

youdao

[LU Ru-kun. The Principle of Nutrition of Soil-Plant and fertilization [m]. Beijing: Chemistry industry press, 1998.].

[31]鲁如坤。土壤-植物营养学原理和施肥[M]。北京：化学工业出版社，1998。

youdao