engleski

N/S ratios in Ribwort Plantain (Plantago lanceolata) as indicator plant

As a part of Croatian Gas-Energetic System Podravina (CGESP) Central Gas Station (CGS) Molve located in Northern part of Croatia refines earth gas of more surrounding boreholes. Scientists of multidisciplinary research team monitor its influence on all components of agro-ecosystem ; air, water, soil (including of earthworms), plant, forest, animal (wild and domestic) during last seventeen years (1991-2007). Since 1991, soil and agro-ecosystem monitoring has made by Department for General Agronomy University of Zagreb on the carefully selected representative points located on different soil types of CGS surrounding.. Variations of physical and chemical properties of soil and chemical properties in Ribwort Plantain (Plantago lanceolata) taking as an indicator plant have been monitoring. This paper presents results of nitrogen and sulfur content and its ratios from Spring 2000 to Spring 2007 monitoring period measured in Plantago lanceolata plant grown at different soil types of surroundings CGS (around of boreholes as potential sources of emission: Molve-9 (M-9), M-10, M-11, M-12 , M-14 and in the yard of CGS). Nitrogen and sulfur as plant macronutrients differ in the forms they are absorbed by the plant, by their functions in the plant, by their mobility in the plant and by the plant deficiency or toxicity symptoms characteristic of the nutrient. Natural balance of these two elements in soil and plant could be disturbed due to some anthropogenic influences like emission from gas treatment - refination. Result shows that nitrogen content varied between 0.452 % and 3.510 % in dry matter of plant (DM), for sulfur we observed values from 0.142 % up to 0.712 % DM and N/S ratios varied between 2.282 and 15.476 depending on sampling location (soil type) and sampling time. Minimal N/S ratio of Plantago we observed on Gleysol vertic but maximal one on Regosol on aeolian sand, both in autumnal period.

N/S ratio; sulfur in plant; indicator plant; monitoring; Plantago lanceolata

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