Utilization of silicon from metallurgy slag by sugarcane

Abstract

Sugarcane is a species that accumulates silicon (Si) and has the ability to respond to silicon fertilisation, especially in soils where this element is scarce. Metallurgy slags constitute a source of Si in soils where this crop is grown. The objective of this paper was to study the value of metallurgy slag as a source of Si for sugarcane. A randomised block experimental design was adopted, in a 2×4 factorial combination represented by two sugarcane cultivars (SP81-3250 and RB86-7515) and four Si rates of slag providing 0, 100, 200, and 400 kg/ha. The application of metallurgy slag (silicate) increased the available soil Si content as well as the status of available Si and the Si content in sugarcane leaves. The amount of Si from the applied silicate accumulated by the above-ground part of sugarcane ranged between 23 and 56% in varieties RB86-7515 and SP81-3250, respectively. On average, 39% of the Si absorbed by the above-ground part of sugarcane came from the applied fertiliser (silicate).