Abstract
Researchs used steel slag as ameliorant had proven that it can improve some soil chemical characteristics. The objective of this reasearch was to investigate the influence of microparticle of steel slag in improving some soil chemical characteristics of Ultisols. The treatments were arrange in Completely Randomized Designed (CRD) with ten treatments: control (without steel slag), steel slag in coarse particle (mesh), and 1-9% (in weight percentage) of microparticle of steel slag. The soil and the treatments were repeated three times and incubated for four months and then be analyzed the change of soil characteristics due to the amelioration after 1, 2, 3 and 4 months of incubation period. The result showed that amelioration of Ultisols with microparticle of steel slag improved several soil characteristics like increased pH, CEC, available P, and exchangeable basic cations like Ca, Mg, K and Na. The treatments did not decrease the P-fixation, however they increased available P.
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