Performance of cool-season turfgrasses in nitrogen fertility programs in the mountain region of Georgia / B.J. Johnson, R.N. Carrow. -- Athens : Univ. of Georgia, 1993. -- 18 s. : 3 obr., 10 tab. -- (Research bulletin Nr. 410). -- ISSN 0072-128X. hnojenie dusíkom * dusík * trávy * hnojenie tráv