급랭광재(急冷鑛滓)의 비료화(肥料化)에 관(關)한 연구(硏究) -II. 수도(水稻)에 대한 급랭광재(急冷鑛滓)의 입도별(粒度別) 비효(肥效)

Utilization of Blast Furnace Slag Quenched with Water as a Source of Silicate Fertilizer -II. Effect of Particle Size Distribution of Quenched Slag on Rice Yields

제철광재(製鐵鑛滓)로 부생(副生)되는 급랭광재(急冷鑛滓)를 규산질비료(珪酸質肥料) 자원(資源)으로서의 활용성(活用性)을 검토(檢討)해보고저 시판(市販) 규산질비료(珪酸質肥料)를 대조(對照)로 입도수준별(粒度水準別)로 규산함량(珪酸含量)이 낮은 사양토(砂壤土)를 공시(供試)하여 pot시험(試驗)으로 비효(肥效)를 구명(究明)하였다. 수도수량(水稻收量)은 급랭광재(急冷鑛滓)가 시판(市販) 서랭광재(徐冷鑛滓)에 비(比)하여 증수(增收)되었으며 이는 식물체(植物體) 규산함량(珪酸含量)이 높은 것과 일치(一致)되었다. 식물체중(植物體中) 규산함량(珪酸含量)이 높은것은 급랭광재(急冷鑛滓)에서 규산(珪酸)의 공급력(供給力)이 신속(迅速)한 때문이며, 토양중(土壤中) 규산함량(珪酸含量)은 서랭광재(徐冷鑛滓)에서 높았으며 이는 서랭광재(徐冷鑛滓)에서 규산용출(珪酸溶出)이 지속(持續)되어 토양(土壤)에 많이 잔존(殘存)해 있는 것으로 판단(判斷)되었다. 이와같은 결과(結果)로 보아 급랭광재(急冷鑛滓)는 규산질비료(珪酸質肥料) 자원(資源)으로 활용(活用)이 가능(可能)할 것이다.

The objective of this study was to attest the feasibility of the utilization of the blast furnace slag, quenched with water as a source of silicate fertilizer. A pot experiment was conducted to evaluate the effect of quenched slag and its particle size distribution on rice plant growth over the corresponding air-cooled slag of milled commercial silicate fertilizer. The yields of rice were slightly higher in quenched slag than in the commericial air-cooled slag, however, no significant statistical difference was observed. The silica content of rice plants through the growing period was high in quenched slag in any tested particle sizes. This indicated that the quenched slag might release silica fastly in soil. On the other hand, the available silica content retained in soil was high in air cooled slag, which implied that the silica of air-cooled slag was low acting. The results suggested that the quenched slag may be potentially utilized as a source of silicate fertilizer.