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The methodology proposes criteria for determination of the content of micro-nutrients in soils and their evaluation via useing of the extraction method Mehlich 3: certified methodology for practice
Čermák, Pavel ; Mühlbachová, Gabriela ; Káš, Martin ; Vavera, Radek ; Pechová, Miroslava
The methodology proposes criteria for determination of the content of micro-nutrients in soils and their evaluation via useing of the extraction method Mehlich 3. Extraction procedure Mehlich 3 is the official analytical method currently used in testing system of agricultural soils for the determination of the content of available P, K, Mg and Ca. There are criteria for valuation of content of these available nutrients - see Decree No. 275/1998 Coll., on Agrochemical Testing of Agricultural Soil and Land Surveys of Forest Lands, as amended). The existing criteria for above mentioned nutrients are due to this methodology extended by next five elements (Cu, Fe, Mn, Zn and B), marked in field of plant nutrition as micro-nutrients. The simple and easy Mehlich 3 analytical procedure applicable to a variety of different elements, is already used in a wide range of laboratories, allows to extend the criteria for the others elements. In addition, many laboratories can use the multi-elementar analytical instruments ICP-OES. Suggested criteria will also serve for farmers for valuation of soil supply by micro-elements.
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Poruchy kalciového metabolizmu u masného a dojeného skotu
NOVÁ, Hana
The aim of this thesis was to evaluate the disorders of calcium metabolism occuring in breeding of milk cattle and beef cattle. The disorders are not only serious health problem but also economic problem, the disorders can be prevented by balance of ration of fodder respecting physiological needs of high-productive animals. The research took place in 2013-2015 in 3 breeding of dairy cows (Haklovy Dvory, Velký Bor, Hořepík) and in one breeding of cattle for meat raised on pasture (Čejkovice). Overall, it was examined 179 pieces of cattle. The content of Ca was determined from blood serum and urine, the additional parameter was portion of P, Mg and ALP in blood plasma. Only in breeding of cattle in Hořepík was the content of Ca in normal rate, despite the high consumption of beef cattle in other places was detected the subclinical hypocalcemia. In the period of mating, the older beef cattle raised on pastures suffered from fractures of femur as a consequence of hypocalcemia and the weight of bulls. The factors influencing the presence of hypocalcemia includes the standard of zootechnical and veterinary care and also the real intake of Ca respecting the productive and reproductive level of cattle. The reduced intake of Ca of beef cattle raised on pastures is influenced by the runoff of calcium fertilizers during periodically recurring floods. It is highly recommended to regularly analyze fodder and the content of Ca in body fluids as a preventive measures.
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