The impact of fertiliser types on soil’s macronutrients and microlements content

Abstract

The main focus of this paper is the study of soil’s macronutrients and microelements mobility under the influence of mineral and organic fertilization. Two species of plants were cultivated: winter wheat (Triticum aestivum L.) and potato (Solanum tuberosum L.). The wheat was cultivated on the same lot during three out of four years of crop rotation, while only one year was devoted to the potato. The evolution of microelements’ content such as Cu, Zn, B, Mo, Mn, respectively, and pH from the fertile soil layer (0-20 cm.) was thoroughly analyzed. The modification of microelements content in the soil resulted on one hand from the application of intensive nitrogen fertilizers on different pre-fertilized plots with phosphorus and potassium, and on the other from the decrease of soil pH.The fertilizers applied to the soil changed the versatile phosphates content due to the changes of the soil’s pH value or to the adding of organics or mineral phosphates. Soil pH decreased for both versions: the control version and the variants fertilized only with mineral fertilizers or using both mineral fertilizers and manure. In our research, the values of Mn, Zn, Cu and B decrease, between certain limits, together with the increase of the nitrogen fertilizer dose applied, irrespective of the salt type used. Also, we remark that the phosphorous content in the albic luvisol was low, the mineral fertilizers contributing to its increase of 3-12 mg⋅kg-1 (depending on the treatments applied to) and the versatile potassium suffers insignificant variations.