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The mineral content of forage influenced by previous varying intensity grazing
Pavlů, Klára ; Homolka, Petr (advisor) ; Filip, Filip (referee)
The mineral content of grassland is one of the key factors that determine its quality. The aim of the study was to determine the optimal interval for the grazing and the optimal interval for the hay harvest in relation to the nutrient requirements for cattle and determine the dynamics of pasture forage yield and mineral content during the growing season. H0: Previous different grazing intensity has no effect on biomass yield and the mineral content in the following growing season. The experiment was performed on a long term grazing experiment in 2012 -- 2013, where during the growing season biomass samples were taken and subsequently analyzed for minerals (N, P, K, Ca, Mg, Na). The sampling was carried out in treatments that have been since 1998 at the beginning of June mowed and then intensively or extensively grazed. During the sampling period the access of grazed animals to sampling sites was forbidden. Intensive or extensive grazing in the previous grazing season significantly affected the content of minerals and biomass yields. Especially at the beginning of the growing season the contents of N, Ca and Mg were higher in forage, which was in previous years, intensively grazed. After that, the differences between these two treatments were not significant. Diverse grassland with a higher proportion of herbs contained higher levels of calcium and magnesium. Because of lower K concentrations and higher Ca and Mg concentrations in the fodder there was no problem with tetanus ratio (K/Ca + Mg) by exceeding the limit value of 2.2. The present work shows that the optimal term for hay in mesophilic upland grassland the end of May to mid-June. In this time historically the first cut was conducted. After this period there are revealed such changes in the content of minerals, which significantly deteriorate the forage quality. Therefore, if the first cut after mid-June is postponed then compensatory payments under environmental schemes should progressively compensate financially losses
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