With a purpose of finding out the effects of phosphatic fertilizer application at the grassland establishment and management on the botanical composition, mineral content of grasses and the chemical properties of soil, a field experiment was arranged with four treatments as a randomized complete block design and lasted from September. 1989 to October. 1991 in hilly area near Suweon. The rcsults obtained arc summarized as follows; I. The botanical composition of grassland that phosphatic fertilizer was not applied was poor and the rate of legumes was increased with phosphatic fertilizer application and the effect of phosphatic fertilizer applications was obvious at the grassland management. 2. The mineral contents. N, P. Ca, Mg of grasses were increased with phosphatic fertilizer application but the K/Ca+Mg equivalent ratio of grasses was lowered and K content and Ca/P ratio tended not to be regular. 3. The available phosphorus contents and exchangable cation. Ca. Mg. contents of grassland soil were increased with phosphatic fertilizer applications but potasium contents tended not to be regular. 4. It was necessary to apply phosphatic fertilizer for the establishment and management of grassland. The botanical composition of grassland that phosphatic fertilizer was not applied at the establishment could be corrected into good stand with continuous phosphatic fertilizer applications at the management.