Statistical treatment of aberration of chernozems in area Moravia against complex soil survey

In this paper, an attempt at measure formulation of aberation in the set of results of soil analyses observed on chernozems within Soil science is presented. The statistical evaluation was realized based on the report results from separate districts. The chernozem (regardless of subtype) were chosen as suitable for statistical evaluation. The analysis of one character was calculated for the set of results in topsoil (0–30 cm) and subsoil (30–60 cm). The comparison of average content in topsoil and subsoil was made by t-test. The significant difference is shown in content of humus (topsoil 2.61% and subsoil 1.86%), phosphorus (topsoil 8.31 mg/100 g, subsoil 4.75 mg/100 g) and kalium (topsoil 16.28 mg/100 g and subsoil 9.96 mg/100 g). There is no significant difference in other characters such as content of particles under 0,01 mm (topsoil 40.16% and subsoil 42.67%), exchange reaction (topsoil 7.03 and subsoil 7.00) and CEC – cation exchange kapacity (topsoil 23.74 mmol/100 g and subsoil 23.50 mmol/100 g). With respect to chernozems character it can be deduced, that in most of not anthropically influenced samples from mollic horizon the similar features were observed in both monitored depths. This presumption is supported also by observed differencies: humus content in topsoil was distinctly increased by addition of organic substances in organic fertilisers and by cultivation of perennial forage crops. The aberation was not observed in soil reaction. This fact could be interpreted by suppressor soil ability. Similarly, no aberation was documented in CEC. In view of quality/health of soils it is positive detection because both: exchange reaction and CEC are classified in basic soil characters. The maximal aberation was observed in phosphorous content in topsoil (with log-normal (extreme) distribution of results) and, somewhat less, in kalium content. Both characters are classified in most anthropically affected due to the addition of both components in fertilisers. Similar situation can be monitored also in the influence of humus content.