The influence of fertilization with fresh sewage sludge with the addition of calcium oxide and lignite ash in the proportions dry mass 6:1, 4:1, 3:1 and 2:1 on the content of chromium and copper in plants and soil and uptake of these elements was investigated in pot experiment. Sewage sludge were taken from Siedlce (sludge after methane fermentation) and Łuków (sludge stabilized in oxygenic conditions), eastern Poland. The chromium content in the biomass of the test plants (maize, sunflower and oat) was higher following the application of mixtures of sewage sludge with ash than of the mixtures with CaO. The copper content in plants most often did not significantly depend on the type of additives to the sludge. Various amounts of additives to the sewage sludge did not have a significant effect on the contents of either of the studied trace elements in plants. The contents of chromium and copper in soil after 3 years of cultivation of plants were higher than before the experiment, but these amounts were not significantly differentiated depending on the type and the amount of the used additive (i.e. CaO vs. ash) to sewage sludge.
The aim of this study is to determine the response of biomass yield and the content of K, Na, Ca and Mg in the eastern galega and soil under the influence of nitrogen in the form of (15NH4)2SO4. Three-year field experiment (2005–2007) was carried out on experimental plots belonging to the University of Natural Sciences - Humanities in Siedlce (52°17’N, 22°28’E). Nitrogen 15N was applied as ammonium sulphate at a dose of early spring 1.66 g N.m−2. In each year of the study were collected three cuts of eastern galega budding phase. Shown yield of dry weight of the test plant. The content of K, Na, Ca and Mg in the eastern galega and soil were determined by ICP-AES emission spectrometer with inductively coupled plasma. Subsequently, the uptake and marked weight ratios of macronutrients.
Under the influence of nitrogen in the form of ammonium sulphate, dry matter yield of eastern galega (average of 3 years of research and 3 swaths) increased by 29.7%. Fertilisation with nitrogen contributed to the reduction of K content, increasing the content of Na, Ca, Mg, in a test plant and to increase the pick, all the elements analysed with the yield of biomass. Nitrogen fertilisation resulted in a reduction in the quantitative ratios K: (Ca + Mg), (K + Na) : (Ca + Mg), K: Ca, K : Mg and the total content of the analysed elements in the soil (average of the years).
The paper presents the changes in chromium and nickel content in goat’s rue biomass cultivated in the years 2005-2007. Field test was carried out on the experimental field belonging to the University of Natural Sciences and Humanities in Siedlce. The tests included six objects with constant phosphorus fertilisation and differentiated potassium fertilisation. During each year of the tests, three cuts of the test plant in budding stage were harvested. Total Cr and Ni content in the plant and soil was determined using inductively coupled plasma-atomic emission spectrometer. The uptake of the elements being analysed with the crop of dry mass of the test plant was calculated.
Phosphorus and potassium fertilisation had significant influence on the increase in chromium and nickel content in goat’s rue biomass. The highest content of chromium was determined on P50 object and of nickel on P50K150 object. The lowest content of Cr and N was determined in the test plant cultivated on control objects. The highest content of chromium and nickel was found in soil taken from the control object. The highest uptake with crop was observed for goat’s rue fertilised with P50 dose and of nickel with P50K150 dose.