CONTENTS OF MACRONUTRIENTS IN SOILS IN BASAL SOIL MONITORING SYSTEM IN THE CZECH REPUBLIC

The net of monitoring sites in the Czech Republic was established in 1992 to ensure quality of agricultural production and to protect production and environmental functions of agricultural ecosystems. Soil samples are taken in regular six-year periods. Contents of macronutrients P, K, Mg, Ca, S are observed. Other agrochemical soil properties (cation exchange capacity CEC, CoxNIR, NtotNIR, soil reaction, Cu, Zn, Mn, Fe, B, Mo and heavy metals) are also analysed. The last sampling was carried out in 2013 on arable land, grassland, orchards, vineyards and hop gardens, 214 plots totally. Contents of available macronutrients in soils were determined in Mehlich III. Means of nutrients and pH in topsoil were: 97 mg P. kg(-1), 199 mg K. kg(-1), 194 mg Mg. kg(-1), 2,916 mg Ca. kg(-1), exchange soil reaction 6.1.