Goal. Determine the influence of sowing terms, sowing method and depth of seeding on the formation of biometric indices of thistle plants in the conditions of the Right Bank Forest-steppe of Ukraine. Methods. Field, analytical and statistical. Results It was established that in variants, where the seed was carried out per 1 cm, the plants were low-growth, even octomized. They were distinguished by a smaller gabit. The highest plants formed the first line of sowing broad-leaved crops when seeding 2 and 3 cm, plant height reached 135.8-139.3 cm. The largest number of seeds in the basket were allocated variants of sowing in the first decade of April with a width of rows of 45 cm and depth of seeding 2 and 3 cm. This indicator was 123.5 and 124.2 pc from the plant, that is, with an excess of control at 22.4 and 21.7 pc. The largest amount of seed from a plant was 1316.2 pc. Marked on the first-line variant (at the level of the thermal regime of the soil 8-10 ° С) sowing with a width of between rows of 45 cm and depth of seeding of 3 cm. Analysis of the correlation of plant productivity indices and factors The research shows that the yield of the spotted thistle fruit significantly depends on the biometric parameters, such as: the number of seeds from the plant (correlation coefficient r = 0.82), the number of seeds in the basket (correlation coefficient r = 0.89) and plant height (correlation coefficient r = 0.83)
