No abstract

Soil fertility studies emphasize the close correlation of all soil fertility factors starting from soil composition and soil properties, pedogenetic factors, climatic factors interactions, different biological, chemical and physical processes, intensive human influence through apication of various agrotehnical measures in different intensity and duration. The research in this paper is focused on connections between some soil physical properties and soil tipe, or in other words basic soil caracteristics that define productive capacity of that soil type.

Soil fertility is one of basic caracterisitics of every soil tipe and it is a feature that differentiate soil from bedrock. For determination of soil fertility various physiochemical methods are used, primarily for the purpose of applying soil fertilizers in plant nutrition. In this sense, the following parameters of soil fertility were tested in soil samples: pH in potassium-chloride (KCl), CaCO3, humus, total nitrogen, P2O5, K2O. The results of the research showed high soil fertility in a large number of locations that were surveyed, but also the existence of surveyed sites that require the application of pedomeliorative measures.

When buying mineral fertilizer, the user expects that the content of nutrients is in the prescribed minimum values indicated on the packaging and in the declaration and that the quality of used raw materials does not have a negative impact on the environment. The analysis of a number of samples of mineral fertilizers of different quantities and ratios N, P, K showed deviations from the minimum values of nutri-ent content from the declaration as well as increased content of certain heavy metals. For that reason, it is necessary that analyzes of manufactured and imported formulations are more often controlled by the competent institutions with the prescribed method of sampling.