Utilization of Steel Slag in Wetland Rice Cultivation on Peat Soil
An Incubattion experiment in laboratory using peat soil from Lagan, Jambi was c~njpcted to study the effect of steel slag on chemical properties of peat soil. In addition, a pot experiment using die same peat soil was carried out to investigate combination effect of steel slag and NPK, saprodap, or standard fertillzen - urea, SP-36, and KO - on growth and yield or wetland rice. Applicatia or steel slag on peat soil slgniflcantly improved the availability of Si as well as increased soil pH and exchangeable Ca and Mg. On the other band, it significantly decreased soil organic matter content, total N, and the availability of Fe, Mn, and Zn. Moreover, the effect of steel slag on the availability of Cu was not significanL Wetland rice grown on peat soil blgbly responded to steel slag applkadon. The number of productive tiller, number of panicle, and weights of filled and total spikelets were significantly raised with steel slag application. Interaction of steel slag with NPK, saprodap, or standard fertillzen also bad significant effect on those rice yield variables. In combination of steel slag and NPK fertilizer, steel slag 2.S •1. produced the highest rice yield. However, in combination of steel slag and saprodap or standard fertilizers, the highest rice yield was achieved at dosage of steel slag 5.0 •1.. In general, combination of slag 2.5 % and NPK fertilizer produced the highest rice yield. Increasing the growth and yield of rice after application of steel slag was associated with increasing the availability of Si, soil pH, and exchangeable Ca and Mg as well as reducing toxic organic acids.
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