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The Applied Efficiency of Potassium Fertilizer on Summer Maize in Chao Soil of Northern of He Nan
Zhao Shicheng, Liu Xinhong, Han Yanlai, Wang Yilun, Tan Jinfang,
Chinese Agricultural Science Bulletin . 2005, (5): 266 -266 .  DOI: 10.11924/j.issn.1000-6850.0505266