LOŠÁK, T., HLUŠEK, J., JANDÁK, J., FILIPČÍK, R., STRAKOVÁ, M., JANKŮ, Ľ., HUTYROVÁ, H., KNOTOVÁ, D. LOŠÁK, M., ŠEVČÍKOVÁ, M.: The eff ect of soil applications of zeolite, agrisorb and lignite on the chemical composition of clover-grass mixtures grown in arid conditions of South Moravia. Acta univ. agric. et silvic. Mendel. Brun., 2010, LVIII, No. 5, pp. 247-254 The two-year fi eld trial was established in May 2008 on light soil in the cadastre of Ratíškovice near Hodonín in an arid maize-growing production area. Prior to sowing selected soil conditioners were applied in experimental plots of an area of 864 m 2 as follows: zeolite (a mineral of high sorption ca paci ty), lignite (the youngest coal containing humus substances) and the supplementary soil substance agrisorb (polymer organic compound capable of holding in its structure and subsequently releasing water) and they were incorporated into a profi le of 0.15 m. Including the untreated control the experiment involved 4 treatments. The rates of the conditioners were as follows: zeolite -3 l . m −2 , fraction used 1-2 mm; agrisorb -20 g . m −2 ; lignite -1000 g . m −2 . Three types of clover-grass mixtures were sown: landscape mixture with an addition of leguminous plants (seeding rate 200 kg . ha −1 ), regional mixture (100 kg . ha −1 ) and annual mixture (70 kg . ha −1 ). The aboveground biomass taken from an area of 0.05 m 2 was sampled in the stage of bud setting with three repetitions to each treatment. In 2008 and 2009 the respective treatments did not signifi cantly change the contents of N, P, K, Ca and Mg in the aboveground biomass of the clover-grass mixtures. The diff erences in the contents of the macro elements were signifi cant only between the individual types of mixtures and were due to their diff erent botanical composition. Between the years 2008 and 2009 no signifi cant diff erences were discovered among treatments in terms of the contents of P and K in none of the mixtures, but the Mg content decreased in the second year in most treatments by 50 relative % and more. The contents of N and Ca increased signifi cantly in the second year in the regional and landscape mixtures; in the annual mixture also the Ca content. The year-on-year diff erences however were seen also in the untreated control showing the apparent eff ect of the year. A longer period of monitoring is necessary if we are to achieve an objective evaluation of the eff ect of the applied preparations on the chemical composition of the aboveground biomass.
