The precises pot experiments were carried out in 1991 and 1992 year'. The mineral fertilization was the factor which affected crop of seeds, mass of shoots, seeds vessels and roots of Oenothera paradoxu Hudziok. The experiments showed that the highest crop of Oe. paradoxa raw material was obtained by using of nitrogen and in the next tum by combinations of nitrogen with other mineral elements (P, K, Ca and Mg). The content of y-linolenic acid of Oe. paradoxa seeds was differed under the influence of the mineral elements (7.7-8.3%). In spite of it the growth or reduce of yield of oil and 7-linolenic acid depended more on the high of the crops of Oe. paradoxa seeds than on the variants of mineral fertilization.