Vliv termínu využití a přísevu Festuca arundinacea a Festulolium na produkci zimní pastviny

Abstract

The work was carried out to study the influence of additional sowing and differentiated systems of use in the summer period on the production of grass sward in the autumn and winter period. An additional sowing of Festuca arundinacea and Festulolium was made into the grass stand with dominating Festuca rubra, Taraxacum officinale, Agropyron repens, Dactylis glomerata, Trisetum flavescens, Agrostis stolonifera and Phleum pratense. In summer (preparatory cut), the grass stand was utilized in June, July and August. In the autumn (main use), it was utilized in November, December and January. The additional sowing, the preparatory cut and the main use were monitored for their influence on the yield of dry matter. Another assessment was made of the share of Festuca arundinacea and Festulolium in the harvested herbage. In June 2001, the share of additionally sown herb species in the harvested herbage did not exceed 2%. However, their proportion increased to more than 20% in four years of the study. In the summer period, the additional sowing did not show any significant effect on dry matter yields. The additionally sown herb species exhibited a pronounced dominance in November. The shares of Festuca arundinacea and Festulolium in the harvested herbage were 80.1% and 71.3%, respectively. Yields from the additionally sown grass stands were higher from the third year of the study (by 1.07–1.26 t.ha–1) than those from the grass stand with no additional sowing (0.66–0.97 t.ha–1) the variance being insignificant. In the autumn and in winter, a significant decrease (P < 0.05) was seen in yields from the grass stand utilized until the beginning of August and the yields further decreased with the proceeding winter.