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张乃凤先生是我国著名的土壤肥料学家 ,是我国现代土壤肥料科学的开拓者之一。他 1 92 7年留学美国 ,毕业于威斯康星大学研究生院 ,并获土壤学硕士学位。 1 93 1年回国后一直致力于化学肥料试验研究工作 ,至今已 70余年。张乃凤先生是我国肥料田间试验的倡导者。在 1 93 5年 ,
Mr. Zhang Nai-feng is a famous soil and fertilizer scientist in China and one of pioneers of modern soil and fertilizer science in our country. He studied in the United States in 1987 and graduated from the University of Wisconsin Graduate School with a master’s degree in soil science. 1 93 years after returning to China has been committed to the experimental study of chemical fertilizers, has been more than 70 years. Mr. Zhang Nai-feng is an advocator of field trials of fertilizer in China. In 1953,