Abstract
Soil is a complex ecosystem whose functionality is related to the links that exist between chemical, physical, biological parameters and microbial communities. Our purpose was to carry out an analysis of variance of chemical properties of the soil in relation to the vegetation period. The analysis of the soil gives us knowledge about the fertility status of the soil, which is closely related to the nutritional status of plants. The analysis involved urban soil, agricultural soil and greenhouse soil from Dobrogea area. Soil samples come from the urban area: Constanta, agricultural area: Ciocarlia de Sus and greenhouse:Cumpana. To estimate the seasonal changes in the soil, three periods were studied: before vegetation (sowing), after the vegetation period (harvesting), relative rest period (winter). The chemical parameters evaluated were: soil reaction pH (acidity degree), conductivity - as an indicator of the nutrients available in the soil (soluble salts), ion exchange capacity (cations and anions), organic matter (humus), nitrogen content (total nitrogen and nitrites), the amount of extractable iron. The pH values were in the range corresponding to the weak acid-neutral soil for all three types of sample soils, with slight variations from one period to another while the recorded conductivity values indicate that the analyzed soils belong to the category of non-saline soils. The analyzed soil samples presented low concentrations of nitrites and the assimilable iron content was in the range 48.81 - 259.12 ppm.
Highlights
In the last years, the scientific community has focused on soil research because there is a direct link between soil health to obtaining healthy food [1-3]
The highest nitrites content was obtained for the greenhouse soil in the sample taken in April (4.76 mg/kg)
The analyzed soils are strongly alkaline in terms of anionic content and low values of calcium and magnesium ions
Summary
The scientific community has focused on soil research because there is a direct link between soil health to obtaining healthy food [1-3]. The soil is the living covering of the earth that stretches on the layer of rock below and makes life on earth possible. The soil is part of the system that sustains our lives. The soil plays a crucial role in providing food. The soil structure is one of the key factors of soil and environmental quality because a healthy soil is necessary to sustain the development of vegetation and natural successional processes. Chemical soil parameters and appropriate supply of nutrients are very important factors for normal plant growth and development. A comprehensive assessment of the chemical properties of soils is important for explaining the relationship between basic soil processes and in monitoring changes in the soil environment [6]
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