University of Zagreb. Faculty of Agriculture. Department of Plant Nutrition.
Abstract
Čelična šljaka je nusproizvod iz industrije željeza i čelika koja se do sada primarno
zbrinjavala odlaganjem na deponij. Međutim, danas je više nego ikad prije imperativ svakog
društva, koje nastoji efikasnije gospodariti prirodnim resursima neškodljivo oporabiti
nusproizvode na ekološki prihvatljiv način. Jedna od alternativnih metoda odlaganju na
deponij je primjena čelične šljake u poljoprivredi bilo kao poboljšivač tla ili kao gnojivo. Zbog
svojih kemijskih karakteristika čelična šljaka potencijalno predstavlja vrijedan izvor hranjiva,
a visok udio oksida kalcija i magnezija može biti izvor hranjiva, ali i materijal za neutralizaciju
kiselosti tla. Stoga je u istraživanju korištena čelična šljaka visoke pH vrijednosti u kombinaciji
sa distrično smeđim kiselim tlom iz Smiljana. Istraživanje je provedeno inkubacijskim testom
u kontroliranim uvjetima kroz 16 tjedana. Količina troske određena je na temelju rezultata
prethodno provedenih istraživanja, a primijenjena je u dozi 0,0 g kg-1, 0,5 g kg-1, 1,0 g kg-1,
3,0 g kg-1, 6,0 g kg-1i 9,0 g kg-1 tla. U ovom radu ispitivan je utjecaj čelične šljake na promjene
kemijskih karakteristika plodnosti tla. Dobiveni rezultati ukazuju na pozitivan utjecaj troske
na pokazatelje plodnosti tla poput regulacije pH, CEC te bio pristupačnosti P2O5, Ca i Mg u
kiselom tlu. Dobiveni rezultati potvrđuju da se korekcija kiselosti tla može uspješno provesti
primjenom čelične šljake u višim dozama nego konvencionalna uporaba prirodnih materijala
za kalcizaciju poput dolomita ili vapnenaca. Nadalje, porastom doze troske reducira se
koncentracija mobilnog aluminija, povisuje se kapacitet baza za zamjenu u tlu i pH vrijednost
tla kao posljedica porasta koncentracije Ca2+ i Mg2+ iona u tekućoj fazi tla.Steel slag is a product of the iron and steel industry, which has been primarily
disposed of by landfill. However, today, more than ever before, the imperative of every
society that strives to manage more effectively natural resources is to harmlessly recover
products in an environmentally friendly way. One of the alternative methods of disposal to
the dump is the application of steel slag in agriculture either as a soil improvers or as a
fertilizer. Because of its chemical characteristics, steel slags potentially represent a valuable
nutrient source, and high levels of calcium and magnesium oxide can be a source of
nutrients but also a material for acid neutralization of soil. Therefore, a high-pH steel slag in
combination with distric brown acid soil from Smiljan was used in the study. The study was
conducted by incubation test in controlled conditions for 16 weeks. The amount of EAF slag
was determined on the basis of the results of the previously conducted investigations and
was applied at doses of 0,0 g kg-1, 0.5 g kg-1, 1.0 g kg-1, 3.0 g kg-1, 6.0 g kg-1 and 9.0 g kg-1 soil.
This paper investigated the influence of steel slag on changes in chemical properties of soil
fertility. The obtained results indicate a positive impact on soil fertility indicators such as pH
regulation, CEC and the availability of P2O5, Ca and Mg in acidic soil. The obtained results
confirm that soil acidity correction can be successfully carried out using steel slag in higher
doses than conventional use of natural calcium materials such as dolomite or limestone.
Furthermore, by increasing the slag dose, the concentration of mobile aluminum is reduced,
the soil base replacement capacity and soil pH are increased as a consequence of the Ca2+
and Mg2+ ion concentration rise in the liquid phase of the soil
