DORONIN V.V.

Effect of seedbed moisture on the intensity of Panicum virgatum L. germination

Purpose. To study the effect of seedbed humidity during the germination of Panicum virgatum L. on the intensity of germination. Methods. Laboratory analytical and statistical. Results. It is proved that the degree of wetting affects the intensity of germination. The most intensive germination was observed when using 20 to 30 ml of water per cuvet. On the 11th day after sowing when adding 20 to 25 ml/cuvette resulted in 15–16 sprouts, 30 ml/cuvet in 17 sprouts that made up 88–89 % and 89 % germination, respectively. Increasing the amount of water to 35 ml/cuvet as well as decreasing to 15 ml/cuvet decreased the number of germinated seeds. In other days of accounting similar results were obtained. In fact, on the 20th day after sowing all the seeds able to germinate did germinate. It was found that both insufficient and excessive wetting of seedbed affected the intensity of germination, but it was not decisive for the significant reduction in dormancy of seeds and increase in the number of sprouts. Conclusions. The degree of seedbed wetting influences the intensity of germination. The most intensive germination was observed when using 20 to 30 ml of water per cuvet.

The quality of sugar beet seeds as affected by farming techniques

Purpose. To study the features of quality formation in basic sugar beet seeds as affected by farming techniques under the conditions of unstable moistening in the Right Bank Central Forest-Steppe of Ukraine. Methods. Field, laboratory, analytical, and statistical. Results. It was found that seed germination and purity substantially depends on soil moisture during the period of seed germination, the timing of cutting and seed maturation on the seed bearers in rolls. The optimal water regime during the growing season ensured by introducing absorbent Terravit Super into the soil prior to planting provided an increase in seed yield of CMS component and sterility maintainers of 0.31–0.32 t/ha and an increase in seed germination of 5–10 %. The purity of seeds proved to be affected by the timing of harvesting. If the seed bearers were harvested too early or while being prematurely dried, the seed purity decreased by 6–10 % in comparison with the seed harvested in optimal terms. Maturation of seeds on stalks in rolls provided a significant increase in its purity and germination. Conclusions. An effective way to produce high-quality basic sugar beet seeds is to create favourable conditions for the flowering of crossing components and seed maturation as well as to provide plants with moisture throughout the growing season, thereby increasing seed yield and quality.