Object: Regularities in formation of plasticity, stability, prevailing degree, combining ability and heritableness of quantitative signs and determination on the basis of it of plant-breeding value of the created breeding stock for the selection of spring vetch. Objective: Determination of conformities to law of display of level of valuable economic signs of the seed productivity at the samples of collection and hybrid populyaciy of spring vetch by determination adaptiveness, character of inheritance, combining ability and heritableness of quantitative signs, selection and creation on the basis of this valuable breeding stock for a selection. Methods: Field, breeding, biometrical and measuring-weighing; specific for corresponding purposes (genetical, statistical). Novelty: High ecological plasticity and stability of display of valuable economic signs of the seed productivity of sample of spring vetch is set. In the system of the complete diallel'nikh crossings the plant-breedings features of display of quantitative signs of the seed productivity are certain after general and specific combining ability and heritableness of hybrids of F1, which consist in establishment of relative frequency of distributing of dominant and recession alleley of the probed signs of samples of collection of spring vetch and efficiency of their use as donors. Efficiency of creation of lines of vetch is well-proven spring with the enhanceable seed productivity. Results: The plant-breeding process of spring vetch , which foresees application of non-permanent selection in late generations for the increase of level of display of signs of amount of bobs, amount of seed, the masses of seed from a plant and mass 1000 seed. At a necessity the increase of size of signs of length of stem and height of fastening of lower bob to begin an effective selection with the second generation. By the most valuable for a selection samples which have high combining ability after the complex of valuable economic signs, certainly Drobynka, Bilocerkivska 7, Mutant shyrokolystiy , selection of 332/2 and k-789. Perspective plant-breedings numbers are selected with the enhanceable level of the seed productivity (3,8–4,3 t/h) and complex of other valuable economic signs: (23379, 23380, 23381, 23382, 23383, Polinarium and Galinka). In NCGRРU collection for signs is registered and educational collection, and also valuable after the complex of signs standards of Natali, Vorskla, Mutant shyrokolystiy, Bilokvitkova, Polinarium and Galinka. In the State register of sorts of plants, suitable for distribution in Ukraine, the sort of spring vetch Natalka is brought in. Degree of Implementation: The created sort of Natalka is applied in agricultural industry of Ukraine. A copyright certificate is got. Scope of Implementation: Scientific institutions of NAAS and higher educational establishments.
