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Porovnání vytrvalosti a produktivity vybraných odrůd jetele lučního
Bendiková, Simona
Red clover (Trifolium pratense L.) is one of the most important forage crop in the Czech Republic used for production of fresh or preserved fodder. It is grown in pure stands and also in different types of mixtures whith other legumes and grasses. It provides symbiotic nitrogen fixation and helps to significantly increase production of forage eithout the need of high fertilizers use. Today there are placed high demands on new varieties of red clover which has to produce high yields of dry matter with good forage quality, obtain increased resistance to pest and diseases and have also improved persistence. Persistence and yield of varieties of red clover was tested during four growing seasons in the Forage research station in Vatín. In 2011 was sown 15 varieties of red clover and one wild ecotype in mixture with Timothy Grass (Phleum pratense L.) and meadow fescue (Festuca pratensis Hudson). Proportion of red clover was 70 % (14 kg of seeds.ha-1), Timothy Grass 20 % (6 kg of seeds.ha-1) and Festuca pratensis Hudson 10 % (4 kg of seeds.ha-1). In every harvest year three cuts were harvested per year from which samples to assess dry matter content were taken. The highest yield of dry fodder in the third production year (2014) was reached by diploid variety Dafila (16 t.ha-1), this variety was followed by tetraploid variety Astur (15,7 t.ha-1), diploid varieties Milvus (15,4 t.ha-1), Lestris (13,7 t.ha-1) and Start (13,5 t.ha-1). Significantly lowest yield of forage was harvested at the diploid variety AberRuby (7,4 t.ha-1). Evaluation of persistence index revealed that the most persistent was Swiss tetraploid variety Astur, followed by diploid varieties Milvus, Dafila, Elara and Start. The worst results showed British AberRuby variety.
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