The difference of compost sources in reducing the solubilities of copper and zinc of metal standard solution in Red Yellow Podzolic soil from Tanjungan and Latosol from Jabung, Lampung (Indonesia)
1997
Djuniwati, S. | Salam, A.K. | Sarno (Universitas Lampung, Bandar Lampung (Indonesia). Fakultas Pertanian)
Difference sources of organic compost are suggested to be different in lowering the solubilities of heavy metals in soils with different characteristics. Soil samples from upper horizons (0-20 cm) of Red Yellow Podzolic Tanjungan and Latosol Jabung were factorially treated with 2 levels of metal standard solution containing Cu and Zn with the concentration of 0 and 10 mg/kg, and 5 source of organic compost at the rate of 10 ton/ha dry weight i.e: without compost, corn leaf, cassava leaf, alang-alang leaf, soybean leaf. The soil treated were incubated for 8 weeks at 40 percent moisture content. The result showed that corn-leaf and alang-alang compost in Red Yellow Podzolic soil reduced the solubilities of Cu 13.4 percent and 15.8 percent lower than without compost, respectively. However, between corn-leaf and alang-alang-leaf, corn-leaf and cassava-leaf, and without compost were not different. In Latosol soil, cassava-leaf compost reduced the solubilities of Cu as much as 19.3 percent lower than without compost, 20.4 percent lower than did alang-alang-leaf compost. However, among cassava-leaf, corn-leaf, and soybean-leaf composts were not different. Addition of cassava-leaf with metal standard solution most significantly reduced the solubilities of Zn in Latosol. Although increased solubilities of Zn in Red Yellow Podzolic soil, the solubility of Zn in soil treated with cassava leaf was lower than in those treated with corn, alang-alang, and soybean-leaves compost. However, in Latosol soil treated with cassava-leaf compost reduced solubilities of Zn 36.6 percent lower than without compost, 24.7 percent lower than with corn-leaf compost, 33.3 percent lower than with alang-alang-leaf compost, and 35.5 percent lower than with soybean-leaf compost. Comparing the two soils showed that Latosol soil from Jabung possesed higher buffering capacity for Cu and Zn than red yellow podsolic soil from Tanjungan
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