[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。

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[ku "ru-lu" nu] a city of northeast Puerto Rico east-southeast of San Juan. It is a processing center with a textile industry. Population, 147,835.

卡罗利纳：波多黎各东北部一城市，在圣胡安东南偏东，该市为加工业中心，有纺织工业。人口147,835。

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